From c1e9d62ddabc6e74c22e489961dcf98f6460a3e7 Mon Sep 17 00:00:00 2001
From: Weller <1812208341@qq.com>
Date: Fri, 1 Apr 2022 17:02:01 +0800
Subject: [PATCH] null-safe

---
 .dart_tool/package_config.json                | 146 ++++++
 .dart_tool/package_config_subset              |  93 ++++
 .dart_tool/version                            |   1 +
 .idea/.gitignore                              |   3 +
 .idea/dbnavigator.xml                         | 458 ++++++++++++++++++
 .idea/flutter_jdsdk.iml                       |  18 +
 .idea/libraries/Dart_SDK.xml                  |  27 ++
 .idea/libraries/Flutter_Plugins.xml           |   9 +
 .idea/misc.xml                                |   6 +
 .idea/modules.xml                             |   8 +
 .idea/vcs.xml                                 |   6 +
 .packages                                     |  29 ++
 example/.dart_tool/package_config.json        |  98 ++--
 example/.dart_tool/package_config_subset      | 101 ++++
 example/.dart_tool/version                    |   1 +
 example/.flutter-plugins                      |   2 +
 example/.flutter-plugins-dependencies         |   1 +
 example/.packages                             |  31 ++
 example/android/local.properties              |   2 +
 example/ios/Flutter/Generated.xcconfig        |  13 +
 .../ios/Flutter/flutter_export_environment.sh |  13 +
 example/pubspec.lock                          | 167 +++++++
 lib/jdsdk.dart                                |   4 +-
 pubspec.lock                                  | 153 ++++++
 pubspec.yaml                                  |   2 +-
 25 files changed, 1343 insertions(+), 49 deletions(-)
 create mode 100644 .dart_tool/package_config.json
 create mode 100644 .dart_tool/package_config_subset
 create mode 100644 .dart_tool/version
 create mode 100644 .idea/.gitignore
 create mode 100644 .idea/dbnavigator.xml
 create mode 100644 .idea/flutter_jdsdk.iml
 create mode 100644 .idea/libraries/Dart_SDK.xml
 create mode 100644 .idea/libraries/Flutter_Plugins.xml
 create mode 100644 .idea/misc.xml
 create mode 100644 .idea/modules.xml
 create mode 100644 .idea/vcs.xml
 create mode 100644 .packages
 create mode 100644 example/.dart_tool/package_config_subset
 create mode 100644 example/.dart_tool/version
 create mode 100644 example/.flutter-plugins
 create mode 100644 example/.flutter-plugins-dependencies
 create mode 100644 example/.packages
 create mode 100644 example/android/local.properties
 create mode 100644 example/ios/Flutter/Generated.xcconfig
 create mode 100755 example/ios/Flutter/flutter_export_environment.sh
 create mode 100644 example/pubspec.lock
 create mode 100644 pubspec.lock

diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
new file mode 100644
index 0000000..3415be7
--- /dev/null
+++ b/.dart_tool/package_config.json
@@ -0,0 +1,146 @@
+{
+  "configVersion": 2,
+  "packages": [
+    {
+      "name": "async",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/async-2.8.2",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "boolean_selector",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "characters",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/characters-1.2.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "charcode",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.3.1",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "clock",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "collection",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "fake_async",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "flutter",
+      "rootUri": "file:///Users/fnuouser/Documents/code/flutter/packages/flutter",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "flutter_test",
+      "rootUri": "file:///Users/fnuouser/Documents/code/flutter/packages/flutter_test",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "matcher",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "material_color_utilities",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/material_color_utilities-0.1.3",
+      "packageUri": "lib/",
+      "languageVersion": "2.13"
+    },
+    {
+      "name": "meta",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/meta-1.7.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "path",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "sky_engine",
+      "rootUri": "file:///Users/fnuouser/Documents/code/flutter/bin/cache/pkg/sky_engine",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "source_span",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.1",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "stack_trace",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "stream_channel",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "string_scanner",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "term_glyph",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "test_api",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.4.8",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "typed_data",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "vector_math",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.1",
+      "packageUri": "lib/",
+      "languageVersion": "2.14"
+    },
+    {
+      "name": "jdsdk",
+      "rootUri": "../",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    }
+  ],
+  "generated": "2022-03-23T10:13:45.063379Z",
+  "generator": "pub",
+  "generatorVersion": "2.16.1"
+}
diff --git a/.dart_tool/package_config_subset b/.dart_tool/package_config_subset
new file mode 100644
index 0000000..eef31a8
--- /dev/null
+++ b/.dart_tool/package_config_subset
@@ -0,0 +1,93 @@
+async
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/async-2.8.2/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/async-2.8.2/lib/
+boolean_selector
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0/lib/
+characters
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/characters-1.2.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/characters-1.2.0/lib/
+charcode
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.3.1/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.3.1/lib/
+clock
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0/lib/
+collection
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0/lib/
+fake_async
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0/lib/
+matcher
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.11/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.11/lib/
+material_color_utilities
+2.13
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/material_color_utilities-0.1.3/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/material_color_utilities-0.1.3/lib/
+meta
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/meta-1.7.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/meta-1.7.0/lib/
+path
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0/lib/
+source_span
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.1/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.1/lib/
+stack_trace
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0/lib/
+stream_channel
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0/lib/
+string_scanner
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0/lib/
+term_glyph
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0/lib/
+test_api
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.4.8/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.4.8/lib/
+typed_data
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0/lib/
+vector_math
+2.14
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.1/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.1/lib/
+sky_engine
+2.12
+file:///Users/fnuouser/Documents/code/flutter/bin/cache/pkg/sky_engine/
+file:///Users/fnuouser/Documents/code/flutter/bin/cache/pkg/sky_engine/lib/
+flutter
+2.12
+file:///Users/fnuouser/Documents/code/flutter/packages/flutter/
+file:///Users/fnuouser/Documents/code/flutter/packages/flutter/lib/
+flutter_test
+2.12
+file:///Users/fnuouser/Documents/code/flutter/packages/flutter_test/
+file:///Users/fnuouser/Documents/code/flutter/packages/flutter_test/lib/
+jdsdk
+2.12
+file:///Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/
+file:///Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/lib/
+2
diff --git a/.dart_tool/version b/.dart_tool/version
new file mode 100644
index 0000000..fe18249
--- /dev/null
+++ b/.dart_tool/version
@@ -0,0 +1 @@
+2.10.3
\ No newline at end of file
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/dbnavigator.xml b/.idea/dbnavigator.xml
new file mode 100644
index 0000000..fac3a35
--- /dev/null
+++ b/.idea/dbnavigator.xml
@@ -0,0 +1,458 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DBNavigator.Project.DataEditorManager">
+    <record-view-column-sorting-type value="BY_INDEX" />
+    <value-preview-text-wrapping value="true" />
+    <value-preview-pinned value="false" />
+  </component>
+  <component name="DBNavigator.Project.DataExportManager">
+    <export-instructions>
+      <create-header value="true" />
+      <friendly-headers value="false" />
+      <quote-values-containing-separator value="true" />
+      <quote-all-values value="false" />
+      <value-separator value="" />
+      <file-name value="" />
+      <file-location value="" />
+      <scope value="GLOBAL" />
+      <destination value="FILE" />
+      <format value="EXCEL" />
+      <charset value="UTF-8" />
+    </export-instructions>
+  </component>
+  <component name="DBNavigator.Project.DatabaseBrowserManager">
+    <autoscroll-to-editor value="false" />
+    <autoscroll-from-editor value="true" />
+    <show-object-properties value="true" />
+    <loaded-nodes />
+  </component>
+  <component name="DBNavigator.Project.DatabaseFileManager">
+    <open-files />
+  </component>
+  <component name="DBNavigator.Project.EditorStateManager">
+    <last-used-providers />
+  </component>
+  <component name="DBNavigator.Project.ExecutionManager">
+    <retain-sticky-names value="false" />
+  </component>
+  <component name="DBNavigator.Project.MethodExecutionManager">
+    <method-browser />
+    <execution-history>
+      <group-entries value="true" />
+      <execution-inputs />
+    </execution-history>
+    <argument-values-cache />
+  </component>
+  <component name="DBNavigator.Project.ObjectDependencyManager">
+    <last-used-dependency-type value="INCOMING" />
+  </component>
+  <component name="DBNavigator.Project.ObjectQuickFilterManager">
+    <last-used-operator value="EQUAL" />
+    <filters />
+  </component>
+  <component name="DBNavigator.Project.ScriptExecutionManager" clear-outputs="true">
+    <recently-used-interfaces />
+  </component>
+  <component name="DBNavigator.Project.Settings">
+    <connections />
+    <browser-settings>
+      <general>
+        <display-mode value="TABBED" />
+        <navigation-history-size value="100" />
+        <show-object-details value="false" />
+      </general>
+      <filters>
+        <object-type-filter>
+          <object-type name="SCHEMA" enabled="true" />
+          <object-type name="USER" enabled="true" />
+          <object-type name="ROLE" enabled="true" />
+          <object-type name="PRIVILEGE" enabled="true" />
+          <object-type name="CHARSET" enabled="true" />
+          <object-type name="TABLE" enabled="true" />
+          <object-type name="VIEW" enabled="true" />
+          <object-type name="MATERIALIZED_VIEW" enabled="true" />
+          <object-type name="NESTED_TABLE" enabled="true" />
+          <object-type name="COLUMN" enabled="true" />
+          <object-type name="INDEX" enabled="true" />
+          <object-type name="CONSTRAINT" enabled="true" />
+          <object-type name="DATASET_TRIGGER" enabled="true" />
+          <object-type name="DATABASE_TRIGGER" enabled="true" />
+          <object-type name="SYNONYM" enabled="true" />
+          <object-type name="SEQUENCE" enabled="true" />
+          <object-type name="PROCEDURE" enabled="true" />
+          <object-type name="FUNCTION" enabled="true" />
+          <object-type name="PACKAGE" enabled="true" />
+          <object-type name="TYPE" enabled="true" />
+          <object-type name="TYPE_ATTRIBUTE" enabled="true" />
+          <object-type name="ARGUMENT" enabled="true" />
+          <object-type name="DIMENSION" enabled="true" />
+          <object-type name="CLUSTER" enabled="true" />
+          <object-type name="DBLINK" enabled="true" />
+        </object-type-filter>
+      </filters>
+      <sorting>
+        <object-type name="COLUMN" sorting-type="NAME" />
+        <object-type name="FUNCTION" sorting-type="NAME" />
+        <object-type name="PROCEDURE" sorting-type="NAME" />
+        <object-type name="ARGUMENT" sorting-type="POSITION" />
+      </sorting>
+      <default-editors>
+        <object-type name="VIEW" editor-type="SELECTION" />
+        <object-type name="PACKAGE" editor-type="SELECTION" />
+        <object-type name="TYPE" editor-type="SELECTION" />
+      </default-editors>
+    </browser-settings>
+    <navigation-settings>
+      <lookup-filters>
+        <lookup-objects>
+          <object-type name="SCHEMA" enabled="true" />
+          <object-type name="USER" enabled="false" />
+          <object-type name="ROLE" enabled="false" />
+          <object-type name="PRIVILEGE" enabled="false" />
+          <object-type name="CHARSET" enabled="false" />
+          <object-type name="TABLE" enabled="true" />
+          <object-type name="VIEW" enabled="true" />
+          <object-type name="MATERIALIZED VIEW" enabled="true" />
+          <object-type name="INDEX" enabled="true" />
+          <object-type name="CONSTRAINT" enabled="true" />
+          <object-type name="DATASET TRIGGER" enabled="true" />
+          <object-type name="DATABASE TRIGGER" enabled="true" />
+          <object-type name="SYNONYM" enabled="false" />
+          <object-type name="SEQUENCE" enabled="true" />
+          <object-type name="PROCEDURE" enabled="true" />
+          <object-type name="FUNCTION" enabled="true" />
+          <object-type name="PACKAGE" enabled="true" />
+          <object-type name="TYPE" enabled="true" />
+          <object-type name="DIMENSION" enabled="false" />
+          <object-type name="CLUSTER" enabled="false" />
+          <object-type name="DBLINK" enabled="true" />
+        </lookup-objects>
+        <force-database-load value="false" />
+        <prompt-connection-selection value="true" />
+        <prompt-schema-selection value="true" />
+      </lookup-filters>
+    </navigation-settings>
+    <dataset-grid-settings>
+      <general>
+        <enable-zooming value="true" />
+        <enable-column-tooltip value="true" />
+      </general>
+      <sorting>
+        <nulls-first value="true" />
+        <max-sorting-columns value="4" />
+      </sorting>
+      <tracking-columns>
+        <columnNames value="" />
+        <visible value="true" />
+        <editable value="false" />
+      </tracking-columns>
+    </dataset-grid-settings>
+    <dataset-editor-settings>
+      <text-editor-popup>
+        <active value="false" />
+        <active-if-empty value="false" />
+        <data-length-threshold value="100" />
+        <popup-delay value="1000" />
+      </text-editor-popup>
+      <values-actions-popup>
+        <show-popup-button value="true" />
+        <element-count-threshold value="1000" />
+        <data-length-threshold value="250" />
+      </values-actions-popup>
+      <general>
+        <fetch-block-size value="100" />
+        <fetch-timeout value="30" />
+        <trim-whitespaces value="true" />
+        <convert-empty-strings-to-null value="true" />
+        <select-content-on-cell-edit value="true" />
+        <large-value-preview-active value="true" />
+      </general>
+      <filters>
+        <prompt-filter-dialog value="true" />
+        <default-filter-type value="BASIC" />
+      </filters>
+      <qualified-text-editor text-length-threshold="300">
+        <content-types>
+          <content-type name="Text" enabled="true" />
+          <content-type name="Properties" enabled="true" />
+          <content-type name="XML" enabled="true" />
+          <content-type name="DTD" enabled="true" />
+          <content-type name="HTML" enabled="true" />
+          <content-type name="XHTML" enabled="true" />
+          <content-type name="Java" enabled="true" />
+          <content-type name="SQL" enabled="true" />
+          <content-type name="PL/SQL" enabled="true" />
+          <content-type name="JSON" enabled="true" />
+          <content-type name="JSON5" enabled="true" />
+          <content-type name="Groovy" enabled="true" />
+          <content-type name="AIDL" enabled="true" />
+          <content-type name="YAML" enabled="true" />
+          <content-type name="Manifest" enabled="true" />
+        </content-types>
+      </qualified-text-editor>
+      <record-navigation>
+        <navigation-target value="VIEWER" />
+      </record-navigation>
+    </dataset-editor-settings>
+    <code-editor-settings>
+      <general>
+        <show-object-navigation-gutter value="false" />
+        <show-spec-declaration-navigation-gutter value="true" />
+        <enable-spellchecking value="true" />
+        <enable-reference-spellchecking value="false" />
+      </general>
+      <confirmations>
+        <save-changes value="false" />
+        <revert-changes value="true" />
+      </confirmations>
+    </code-editor-settings>
+    <code-completion-settings>
+      <filters>
+        <basic-filter>
+          <filter-element type="RESERVED_WORD" id="keyword" selected="true" />
+          <filter-element type="RESERVED_WORD" id="function" selected="true" />
+          <filter-element type="RESERVED_WORD" id="parameter" selected="true" />
+          <filter-element type="RESERVED_WORD" id="datatype" selected="true" />
+          <filter-element type="RESERVED_WORD" id="exception" selected="true" />
+          <filter-element type="OBJECT" id="schema" selected="true" />
+          <filter-element type="OBJECT" id="role" selected="true" />
+          <filter-element type="OBJECT" id="user" selected="true" />
+          <filter-element type="OBJECT" id="privilege" selected="true" />
+          <user-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="false" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </user-schema>
+          <public-schema>
+            <filter-element type="OBJECT" id="table" selected="false" />
+            <filter-element type="OBJECT" id="view" selected="false" />
+            <filter-element type="OBJECT" id="materialized view" selected="false" />
+            <filter-element type="OBJECT" id="index" selected="false" />
+            <filter-element type="OBJECT" id="constraint" selected="false" />
+            <filter-element type="OBJECT" id="trigger" selected="false" />
+            <filter-element type="OBJECT" id="synonym" selected="false" />
+            <filter-element type="OBJECT" id="sequence" selected="false" />
+            <filter-element type="OBJECT" id="procedure" selected="false" />
+            <filter-element type="OBJECT" id="function" selected="false" />
+            <filter-element type="OBJECT" id="package" selected="false" />
+            <filter-element type="OBJECT" id="type" selected="false" />
+            <filter-element type="OBJECT" id="dimension" selected="false" />
+            <filter-element type="OBJECT" id="cluster" selected="false" />
+            <filter-element type="OBJECT" id="dblink" selected="false" />
+          </public-schema>
+          <any-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="true" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </any-schema>
+        </basic-filter>
+        <extended-filter>
+          <filter-element type="RESERVED_WORD" id="keyword" selected="true" />
+          <filter-element type="RESERVED_WORD" id="function" selected="true" />
+          <filter-element type="RESERVED_WORD" id="parameter" selected="true" />
+          <filter-element type="RESERVED_WORD" id="datatype" selected="true" />
+          <filter-element type="RESERVED_WORD" id="exception" selected="true" />
+          <filter-element type="OBJECT" id="schema" selected="true" />
+          <filter-element type="OBJECT" id="user" selected="true" />
+          <filter-element type="OBJECT" id="role" selected="true" />
+          <filter-element type="OBJECT" id="privilege" selected="true" />
+          <user-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="true" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </user-schema>
+          <public-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="true" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </public-schema>
+          <any-schema>
+            <filter-element type="OBJECT" id="table" selected="true" />
+            <filter-element type="OBJECT" id="view" selected="true" />
+            <filter-element type="OBJECT" id="materialized view" selected="true" />
+            <filter-element type="OBJECT" id="index" selected="true" />
+            <filter-element type="OBJECT" id="constraint" selected="true" />
+            <filter-element type="OBJECT" id="trigger" selected="true" />
+            <filter-element type="OBJECT" id="synonym" selected="true" />
+            <filter-element type="OBJECT" id="sequence" selected="true" />
+            <filter-element type="OBJECT" id="procedure" selected="true" />
+            <filter-element type="OBJECT" id="function" selected="true" />
+            <filter-element type="OBJECT" id="package" selected="true" />
+            <filter-element type="OBJECT" id="type" selected="true" />
+            <filter-element type="OBJECT" id="dimension" selected="true" />
+            <filter-element type="OBJECT" id="cluster" selected="true" />
+            <filter-element type="OBJECT" id="dblink" selected="true" />
+          </any-schema>
+        </extended-filter>
+      </filters>
+      <sorting enabled="true">
+        <sorting-element type="RESERVED_WORD" id="keyword" />
+        <sorting-element type="RESERVED_WORD" id="datatype" />
+        <sorting-element type="OBJECT" id="column" />
+        <sorting-element type="OBJECT" id="table" />
+        <sorting-element type="OBJECT" id="view" />
+        <sorting-element type="OBJECT" id="materialized view" />
+        <sorting-element type="OBJECT" id="index" />
+        <sorting-element type="OBJECT" id="constraint" />
+        <sorting-element type="OBJECT" id="trigger" />
+        <sorting-element type="OBJECT" id="synonym" />
+        <sorting-element type="OBJECT" id="sequence" />
+        <sorting-element type="OBJECT" id="procedure" />
+        <sorting-element type="OBJECT" id="function" />
+        <sorting-element type="OBJECT" id="package" />
+        <sorting-element type="OBJECT" id="type" />
+        <sorting-element type="OBJECT" id="dimension" />
+        <sorting-element type="OBJECT" id="cluster" />
+        <sorting-element type="OBJECT" id="dblink" />
+        <sorting-element type="OBJECT" id="schema" />
+        <sorting-element type="OBJECT" id="role" />
+        <sorting-element type="OBJECT" id="user" />
+        <sorting-element type="RESERVED_WORD" id="function" />
+        <sorting-element type="RESERVED_WORD" id="parameter" />
+      </sorting>
+      <format>
+        <enforce-code-style-case value="true" />
+      </format>
+    </code-completion-settings>
+    <execution-engine-settings>
+      <statement-execution>
+        <fetch-block-size value="100" />
+        <execution-timeout value="20" />
+        <debug-execution-timeout value="600" />
+        <focus-result value="false" />
+        <prompt-execution value="false" />
+      </statement-execution>
+      <script-execution>
+        <command-line-interfaces />
+        <execution-timeout value="300" />
+      </script-execution>
+      <method-execution>
+        <execution-timeout value="30" />
+        <debug-execution-timeout value="600" />
+        <parameter-history-size value="10" />
+      </method-execution>
+    </execution-engine-settings>
+    <operation-settings>
+      <transactions>
+        <uncommitted-changes>
+          <on-project-close value="ASK" />
+          <on-disconnect value="ASK" />
+          <on-autocommit-toggle value="ASK" />
+        </uncommitted-changes>
+        <multiple-uncommitted-changes>
+          <on-commit value="ASK" />
+          <on-rollback value="ASK" />
+        </multiple-uncommitted-changes>
+      </transactions>
+      <session-browser>
+        <disconnect-session value="ASK" />
+        <kill-session value="ASK" />
+        <reload-on-filter-change value="false" />
+      </session-browser>
+      <compiler>
+        <compile-type value="KEEP" />
+        <compile-dependencies value="ASK" />
+        <always-show-controls value="false" />
+      </compiler>
+      <debugger>
+        <debugger-type value="ASK" />
+        <use-generic-runners value="true" />
+      </debugger>
+    </operation-settings>
+    <ddl-file-settings>
+      <extensions>
+        <mapping file-type-id="VIEW" extensions="vw" />
+        <mapping file-type-id="TRIGGER" extensions="trg" />
+        <mapping file-type-id="PROCEDURE" extensions="prc" />
+        <mapping file-type-id="FUNCTION" extensions="fnc" />
+        <mapping file-type-id="PACKAGE" extensions="pkg" />
+        <mapping file-type-id="PACKAGE_SPEC" extensions="pks" />
+        <mapping file-type-id="PACKAGE_BODY" extensions="pkb" />
+        <mapping file-type-id="TYPE" extensions="tpe" />
+        <mapping file-type-id="TYPE_SPEC" extensions="tps" />
+        <mapping file-type-id="TYPE_BODY" extensions="tpb" />
+      </extensions>
+      <general>
+        <lookup-ddl-files value="true" />
+        <create-ddl-files value="false" />
+        <synchronize-ddl-files value="true" />
+        <use-qualified-names value="false" />
+        <make-scripts-rerunnable value="true" />
+      </general>
+    </ddl-file-settings>
+    <general-settings>
+      <regional-settings>
+        <date-format value="MEDIUM" />
+        <number-format value="UNGROUPED" />
+        <locale value="SYSTEM_DEFAULT" />
+        <use-custom-formats value="false" />
+      </regional-settings>
+      <environment>
+        <environment-types>
+          <environment-type id="development" name="Development" description="Development environment" color="-2430209/-12296320" readonly-code="false" readonly-data="false" />
+          <environment-type id="integration" name="Integration" description="Integration environment" color="-2621494/-12163514" readonly-code="true" readonly-data="false" />
+          <environment-type id="production" name="Production" description="Productive environment" color="-11574/-10271420" readonly-code="true" readonly-data="true" />
+          <environment-type id="other" name="Other" description="" color="-1576/-10724543" readonly-code="false" readonly-data="false" />
+        </environment-types>
+        <visibility-settings>
+          <connection-tabs value="true" />
+          <dialog-headers value="true" />
+          <object-editor-tabs value="true" />
+          <script-editor-tabs value="false" />
+          <execution-result-tabs value="true" />
+        </visibility-settings>
+      </environment>
+    </general-settings>
+  </component>
+  <component name="DBNavigator.Project.StatementExecutionManager">
+    <execution-variables />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/flutter_jdsdk.iml b/.idea/flutter_jdsdk.iml
new file mode 100644
index 0000000..2c9cb7e
--- /dev/null
+++ b/.idea/flutter_jdsdk.iml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/build" />
+      <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.dart_tool" />
+      <excludeFolder url="file://$MODULE_DIR$/example/build" />
+      <excludeFolder url="file://$MODULE_DIR$/example/.pub" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Dart SDK" level="project" />
+    <orderEntry type="library" name="Flutter Plugins" level="project" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/libraries/Dart_SDK.xml b/.idea/libraries/Dart_SDK.xml
new file mode 100644
index 0000000..91dae00
--- /dev/null
+++ b/.idea/libraries/Dart_SDK.xml
@@ -0,0 +1,27 @@
+<component name="libraryTable">
+  <library name="Dart SDK">
+    <CLASSES>
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/async" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/cli" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/collection" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/convert" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/core" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/developer" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/ffi" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/html" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/indexed_db" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/io" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/isolate" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/js" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/js_util" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/math" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/mirrors" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/svg" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/typed_data" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/web_audio" />
+      <root url="file://$PROJECT_DIR$/../../flutter/bin/cache/dart-sdk/lib/web_gl" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Flutter_Plugins.xml b/.idea/libraries/Flutter_Plugins.xml
new file mode 100644
index 0000000..53449da
--- /dev/null
+++ b/.idea/libraries/Flutter_Plugins.xml
@@ -0,0 +1,9 @@
+<component name="libraryTable">
+  <library name="Flutter Plugins" type="FlutterPluginsLibraryType">
+    <CLASSES>
+      <root url="file://$PROJECT_DIR$" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..f8c5fc9
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="FrameworkDetectionExcludesConfiguration">
+    <type id="android" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..5b3236d
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/flutter_jdsdk.iml" filepath="$PROJECT_DIR$/.idea/flutter_jdsdk.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.packages b/.packages
new file mode 100644
index 0000000..b54dbf7
--- /dev/null
+++ b/.packages
@@ -0,0 +1,29 @@
+# This file is deprecated. Tools should instead consume 
+# `.dart_tool/package_config.json`.
+# 
+# For more info see: https://dart.dev/go/dot-packages-deprecation
+# 
+# Generated by pub on 2022-03-23 18:13:45.052458.
+async:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/async-2.8.2/lib/
+boolean_selector:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0/lib/
+characters:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/characters-1.2.0/lib/
+charcode:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.3.1/lib/
+clock:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0/lib/
+collection:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0/lib/
+fake_async:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0/lib/
+flutter:file:///Users/fnuouser/Documents/code/flutter/packages/flutter/lib/
+flutter_test:file:///Users/fnuouser/Documents/code/flutter/packages/flutter_test/lib/
+matcher:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.11/lib/
+material_color_utilities:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/material_color_utilities-0.1.3/lib/
+meta:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/meta-1.7.0/lib/
+path:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0/lib/
+sky_engine:file:///Users/fnuouser/Documents/code/flutter/bin/cache/pkg/sky_engine/lib/
+source_span:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.1/lib/
+stack_trace:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0/lib/
+stream_channel:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0/lib/
+string_scanner:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0/lib/
+term_glyph:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0/lib/
+test_api:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.4.8/lib/
+typed_data:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0/lib/
+vector_math:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.1/lib/
+jdsdk:lib/
diff --git a/example/.dart_tool/package_config.json b/example/.dart_tool/package_config.json
index 66ac825..fb634fc 100644
--- a/example/.dart_tool/package_config.json
+++ b/example/.dart_tool/package_config.json
@@ -3,141 +3,147 @@
   "packages": [
     {
       "name": "async",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/async-2.5.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/async-2.8.2",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "boolean_selector",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "characters",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/characters-1.1.0-nullsafety.3",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/characters-1.2.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "charcode",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.2.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.3.1",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "clock",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "collection",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0-nullsafety.3",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "cupertino_icons",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.3",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.3",
       "packageUri": "lib/",
       "languageVersion": "2.0"
     },
     {
       "name": "fake_async",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "flutter",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/packages/flutter",
+      "rootUri": "file:///Users/fnuouser/Documents/code/flutter/packages/flutter",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "flutter_test",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/packages/flutter_test",
+      "rootUri": "file:///Users/fnuouser/Documents/code/flutter/packages/flutter_test",
       "packageUri": "lib/",
-      "languageVersion": "2.2"
+      "languageVersion": "2.12"
     },
     {
       "name": "jdsdk",
       "rootUri": "../../",
       "packageUri": "lib/",
-      "languageVersion": "2.1"
+      "languageVersion": "2.12"
     },
     {
       "name": "matcher",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.10-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.11",
+      "packageUri": "lib/",
+      "languageVersion": "2.12"
+    },
+    {
+      "name": "material_color_utilities",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/material_color_utilities-0.1.3",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.13"
     },
     {
       "name": "meta",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/meta-1.3.0-nullsafety.3",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/meta-1.7.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "path",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "sky_engine",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/bin/cache/pkg/sky_engine",
+      "rootUri": "file:///Users/fnuouser/Documents/code/flutter/bin/cache/pkg/sky_engine",
       "packageUri": "lib/",
-      "languageVersion": "1.11"
+      "languageVersion": "2.12"
     },
     {
       "name": "source_span",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.0-nullsafety.2",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.1",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "stack_trace",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "stream_channel",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "string_scanner",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "term_glyph",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0-nullsafety.1",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "test_api",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.2.19-nullsafety.2",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.4.8",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "typed_data",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0-nullsafety.3",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "vector_math",
-      "rootUri": "file:///Users/fnuoos/development/flutter/flutter/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.0-nullsafety.3",
+      "rootUri": "file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.1",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.14"
     },
     {
       "name": "jdsdk_example",
@@ -146,7 +152,7 @@
       "languageVersion": "2.1"
     }
   ],
-  "generated": "2021-05-21T07:44:13.030851Z",
+  "generated": "2022-03-23T10:13:46.040839Z",
   "generator": "pub",
-  "generatorVersion": "2.10.0"
+  "generatorVersion": "2.16.1"
 }
diff --git a/example/.dart_tool/package_config_subset b/example/.dart_tool/package_config_subset
new file mode 100644
index 0000000..787a937
--- /dev/null
+++ b/example/.dart_tool/package_config_subset
@@ -0,0 +1,101 @@
+async
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/async-2.8.2/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/async-2.8.2/lib/
+boolean_selector
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0/lib/
+characters
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/characters-1.2.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/characters-1.2.0/lib/
+charcode
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.3.1/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.3.1/lib/
+clock
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0/lib/
+collection
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0/lib/
+cupertino_icons
+2.0
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.3/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.3/lib/
+fake_async
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0/lib/
+matcher
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.11/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.11/lib/
+material_color_utilities
+2.13
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/material_color_utilities-0.1.3/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/material_color_utilities-0.1.3/lib/
+meta
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/meta-1.7.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/meta-1.7.0/lib/
+path
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0/lib/
+source_span
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.1/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.1/lib/
+stack_trace
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0/lib/
+stream_channel
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0/lib/
+string_scanner
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0/lib/
+term_glyph
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0/lib/
+test_api
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.4.8/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.4.8/lib/
+typed_data
+2.12
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0/lib/
+vector_math
+2.14
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.1/
+file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.1/lib/
+sky_engine
+2.12
+file:///Users/fnuouser/Documents/code/flutter/bin/cache/pkg/sky_engine/
+file:///Users/fnuouser/Documents/code/flutter/bin/cache/pkg/sky_engine/lib/
+flutter
+2.12
+file:///Users/fnuouser/Documents/code/flutter/packages/flutter/
+file:///Users/fnuouser/Documents/code/flutter/packages/flutter/lib/
+flutter_test
+2.12
+file:///Users/fnuouser/Documents/code/flutter/packages/flutter_test/
+file:///Users/fnuouser/Documents/code/flutter/packages/flutter_test/lib/
+jdsdk
+2.12
+file:///Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/
+file:///Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/lib/
+jdsdk_example
+2.1
+file:///Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/example/
+file:///Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/example/lib/
+2
diff --git a/example/.dart_tool/version b/example/.dart_tool/version
new file mode 100644
index 0000000..fe18249
--- /dev/null
+++ b/example/.dart_tool/version
@@ -0,0 +1 @@
+2.10.3
\ No newline at end of file
diff --git a/example/.flutter-plugins b/example/.flutter-plugins
new file mode 100644
index 0000000..572e31e
--- /dev/null
+++ b/example/.flutter-plugins
@@ -0,0 +1,2 @@
+# This is a generated file; do not edit or check into version control.
+jdsdk=/Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/
diff --git a/example/.flutter-plugins-dependencies b/example/.flutter-plugins-dependencies
new file mode 100644
index 0000000..7a21a95
--- /dev/null
+++ b/example/.flutter-plugins-dependencies
@@ -0,0 +1 @@
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"jdsdk","path":"/Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/","dependencies":[]}],"android":[{"name":"jdsdk","path":"/Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/","dependencies":[]}],"macos":[],"linux":[],"windows":[],"web":[]},"dependencyGraph":[{"name":"jdsdk","dependencies":[]}],"date_created":"2022-03-23 18:13:46.127157","version":"2.10.3"}
\ No newline at end of file
diff --git a/example/.packages b/example/.packages
new file mode 100644
index 0000000..cc7fc62
--- /dev/null
+++ b/example/.packages
@@ -0,0 +1,31 @@
+# This file is deprecated. Tools should instead consume 
+# `.dart_tool/package_config.json`.
+# 
+# For more info see: https://dart.dev/go/dot-packages-deprecation
+# 
+# Generated by pub on 2022-03-23 18:13:46.031638.
+async:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/async-2.8.2/lib/
+boolean_selector:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/boolean_selector-2.1.0/lib/
+characters:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/characters-1.2.0/lib/
+charcode:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/charcode-1.3.1/lib/
+clock:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/clock-1.1.0/lib/
+collection:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/collection-1.15.0/lib/
+cupertino_icons:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.3/lib/
+fake_async:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/fake_async-1.2.0/lib/
+flutter:file:///Users/fnuouser/Documents/code/flutter/packages/flutter/lib/
+flutter_test:file:///Users/fnuouser/Documents/code/flutter/packages/flutter_test/lib/
+jdsdk:../lib/
+matcher:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/matcher-0.12.11/lib/
+material_color_utilities:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/material_color_utilities-0.1.3/lib/
+meta:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/meta-1.7.0/lib/
+path:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/path-1.8.0/lib/
+sky_engine:file:///Users/fnuouser/Documents/code/flutter/bin/cache/pkg/sky_engine/lib/
+source_span:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/source_span-1.8.1/lib/
+stack_trace:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stack_trace-1.10.0/lib/
+stream_channel:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/stream_channel-2.1.0/lib/
+string_scanner:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/string_scanner-1.1.0/lib/
+term_glyph:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/term_glyph-1.2.0/lib/
+test_api:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/test_api-0.4.8/lib/
+typed_data:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/typed_data-1.3.0/lib/
+vector_math:file:///Users/fnuouser/.pub-cache/hosted/pub.flutter-io.cn/vector_math-2.1.1/lib/
+jdsdk_example:lib/
diff --git a/example/android/local.properties b/example/android/local.properties
new file mode 100644
index 0000000..72c745d
--- /dev/null
+++ b/example/android/local.properties
@@ -0,0 +1,2 @@
+sdk.dir=/Users/fnuouser/Library/Android/sdk
+flutter.sdk=/Users/fnuouser/Documents/code/flutter
\ No newline at end of file
diff --git a/example/ios/Flutter/Generated.xcconfig b/example/ios/Flutter/Generated.xcconfig
new file mode 100644
index 0000000..48174ff
--- /dev/null
+++ b/example/ios/Flutter/Generated.xcconfig
@@ -0,0 +1,13 @@
+// This is a generated file; do not edit or check into version control.
+FLUTTER_ROOT=/Users/fnuouser/Documents/code/flutter
+FLUTTER_APPLICATION_PATH=/Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/example
+COCOAPODS_PARALLEL_CODE_SIGN=true
+FLUTTER_TARGET=lib/main.dart
+FLUTTER_BUILD_DIR=build
+FLUTTER_BUILD_NAME=1.0.0
+FLUTTER_BUILD_NUMBER=1
+EXCLUDED_ARCHS[sdk=iphonesimulator*]=i386
+DART_OBFUSCATION=false
+TRACK_WIDGET_CREATION=false
+TREE_SHAKE_ICONS=false
+PACKAGE_CONFIG=.packages
diff --git a/example/ios/Flutter/flutter_export_environment.sh b/example/ios/Flutter/flutter_export_environment.sh
new file mode 100755
index 0000000..f5656e8
--- /dev/null
+++ b/example/ios/Flutter/flutter_export_environment.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+# This is a generated file; do not edit or check into version control.
+export "FLUTTER_ROOT=/Users/fnuouser/Documents/code/flutter"
+export "FLUTTER_APPLICATION_PATH=/Users/fnuouser/Documents/code/zhiying/flutter_jdsdk/example"
+export "COCOAPODS_PARALLEL_CODE_SIGN=true"
+export "FLUTTER_TARGET=lib/main.dart"
+export "FLUTTER_BUILD_DIR=build"
+export "FLUTTER_BUILD_NAME=1.0.0"
+export "FLUTTER_BUILD_NUMBER=1"
+export "DART_OBFUSCATION=false"
+export "TRACK_WIDGET_CREATION=false"
+export "TREE_SHAKE_ICONS=false"
+export "PACKAGE_CONFIG=.packages"
diff --git a/example/pubspec.lock b/example/pubspec.lock
new file mode 100644
index 0000000..49feae2
--- /dev/null
+++ b/example/pubspec.lock
@@ -0,0 +1,167 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.8.2"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  charcode:
+    dependency: transitive
+    description:
+      name: charcode
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.15.0"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.1.3"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  jdsdk:
+    dependency: "direct dev"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "0.0.1"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.11"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.1.3"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.7.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.0"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.1"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.10.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.4.8"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.0"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.1"
+sdks:
+  dart: ">=2.14.0 <3.0.0"
diff --git a/lib/jdsdk.dart b/lib/jdsdk.dart
index 4089065..d028b2e 100644
--- a/lib/jdsdk.dart
+++ b/lib/jdsdk.dart
@@ -12,13 +12,13 @@ class Jdsdk {
   }
 
   ///初始化sdk
-  static Future<String> init({@required String appKey, @required String appSecret}) async {
+  static Future<String?> init({required String appKey, required String appSecret}) async {
     var result = await _channel.invokeMethod('init',{"appKey": appKey, "appSecret": appSecret});
     return result?.toString();
   }
 
   ///打开京东任意url
-  static Future<String> openUrl({@required String url}) async {
+  static Future<String?> openUrl({required String url}) async {
     final String version = await _channel.invokeMethod('openUrl',{"url": url});
     return version?.toString();
   }
diff --git a/pubspec.lock b/pubspec.lock
new file mode 100644
index 0000000..e12fb22
--- /dev/null
+++ b/pubspec.lock
@@ -0,0 +1,153 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.8.2"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  charcode:
+    dependency: transitive
+    description:
+      name: charcode
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.15.0"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.11"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.1.3"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.7.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.0"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.1"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.10.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.0"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.4.8"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.0"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.1"
+sdks:
+  dart: ">=2.14.0 <3.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index e97fa56..816aaf1 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,7 @@ author: wuchaowen <chaowen1110@gmail.com>
 homepage: https://github.com/selfimgr/flutter_jdsdk.git
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter: