diff --git a/meiqiachat/.gitignore b/meiqiachat/.gitignore
index e9dc58d..430349c 100644
--- a/meiqiachat/.gitignore
+++ b/meiqiachat/.gitignore
@@ -1,3 +1,5 @@
+*.iml
+.idea
 .DS_Store
 .dart_tool/
 
diff --git a/meiqiachat/.idea/libraries/Dart_SDK.xml b/meiqiachat/.idea/libraries/Dart_SDK.xml
deleted file mode 100644
index cd48a0d..0000000
--- a/meiqiachat/.idea/libraries/Dart_SDK.xml
+++ /dev/null
@@ -1,19 +0,0 @@
-<component name="libraryTable">
-  <library name="Dart SDK">
-    <CLASSES>
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/async" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/collection" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/convert" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/core" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/developer" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/html" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/io" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/isolate" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/math" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/mirrors" />
-      <root url="file:///Users/taiyue/FlutterLib/flutter/bin/cache/dart-sdk/lib/typed_data" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>
\ No newline at end of file
diff --git a/meiqiachat/.idea/libraries/Flutter_for_Android.xml b/meiqiachat/.idea/libraries/Flutter_for_Android.xml
deleted file mode 100644
index 2537aca..0000000
--- a/meiqiachat/.idea/libraries/Flutter_for_Android.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<component name="libraryTable">
-  <library name="Flutter for Android">
-    <CLASSES>
-      <root url="jar:///Users/taiyue/FlutterLib/flutter/bin/cache/artifacts/engine/android-arm/flutter.jar!/" />
-    </CLASSES>
-    <JAVADOC />
-    <SOURCES />
-  </library>
-</component>
diff --git a/meiqiachat/.idea/modules.xml b/meiqiachat/.idea/modules.xml
deleted file mode 100644
index 16d6bd6..0000000
--- a/meiqiachat/.idea/modules.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/meiqiachat.iml" filepath="$PROJECT_DIR$/meiqiachat.iml" />
-      <module fileurl="file://$PROJECT_DIR$/android/meiqiachat_android.iml" filepath="$PROJECT_DIR$/android/meiqiachat_android.iml" />
-      <module fileurl="file://$PROJECT_DIR$/example/android/meiqiachat_example_android.iml" filepath="$PROJECT_DIR$/example/android/meiqiachat_example_android.iml" />
-    </modules>
-  </component>
-</project>
diff --git a/meiqiachat/.idea/runConfigurations/example_lib_main_dart.xml b/meiqiachat/.idea/runConfigurations/example_lib_main_dart.xml
deleted file mode 100644
index 5fd9159..0000000
--- a/meiqiachat/.idea/runConfigurations/example_lib_main_dart.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="example/lib/main.dart" type="FlutterRunConfigurationType" factoryName="Flutter">
-    <option name="filePath" value="$PROJECT_DIR$/example/lib/main.dart" />
-    <method />
-  </configuration>
-</component>
\ No newline at end of file
diff --git a/meiqiachat/.idea/workspace.xml b/meiqiachat/.idea/workspace.xml
deleted file mode 100644
index 0ecc48c..0000000
--- a/meiqiachat/.idea/workspace.xml
+++ /dev/null
@@ -1,45 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="FileEditorManager">
-    <leaf>
-      <file leaf-file-name="meiqiachat.dart" pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/lib/meiqiachat.dart">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="0">
-              <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file leaf-file-name="main.dart" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/example/lib/main.dart">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="0">
-              <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-    </leaf>
-  </component>
-  <component name="ToolWindowManager">
-    <editor active="true" />
-    <layout>
-      <window_info id="Project" active="true" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
-    </layout>
-  </component>
-  <component name="ProjectView">
-    <navigator currentView="ProjectPane" proportions="" version="1">
-    </navigator>
-    <panes>
-      <pane id="ProjectPane">
-        <option name="show-excluded-files" value="false" />
-      </pane>
-    </panes>
-  </component>
-  <component name="PropertiesComponent">
-    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
-    <property name="dart.analysis.tool.window.force.activate" value="true" />
-    <property name="show.migrate.to.gradle.popup" value="false" />
-  </component>
-</project>
diff --git a/meiqiachat/android/build.gradle b/meiqiachat/android/build.gradle
index 80396b0..2a17104 100644
--- a/meiqiachat/android/build.gradle
+++ b/meiqiachat/android/build.gradle
@@ -26,7 +26,7 @@ android {
 
     defaultConfig {
         minSdkVersion 16
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     lintOptions {
         disable 'InvalidPackage'
@@ -36,7 +36,7 @@ android {
 
 dependencies {
     implementation 'com.meiqia:meiqiasdk:3.5.8'
-    implementation 'com.android.support:support-v4:28.0.0'
+    implementation 'androidx.core:core:1.0.2'
     implementation 'com.squareup.okhttp3:okhttp:4.1.0'
 
     implementation 'com.github.bumptech.glide:glide:4.9.0'
diff --git a/meiqiachat/example/android/app/build.gradle b/meiqiachat/example/android/app/build.gradle
index b3bf12c..f70aa3d 100644
--- a/meiqiachat/example/android/app/build.gradle
+++ b/meiqiachat/example/android/app/build.gradle
@@ -38,7 +38,7 @@ android {
         targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
@@ -56,6 +56,6 @@ flutter {
 
 dependencies {
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'com.android.support.test:runner:1.0.2'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    androidTestImplementation 'androidx.test:runner:1.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 }
diff --git a/meiqiachat/meiqiachat.iml b/meiqiachat/meiqiachat.iml
deleted file mode 100644
index 429df7d..0000000
--- a/meiqiachat/meiqiachat.iml
+++ /dev/null
@@ -1,19 +0,0 @@
-<?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://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/lib" isTestSource="false" />
-      <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
-      <excludeFolder url="file://$MODULE_DIR$/.idea" />
-      <excludeFolder url="file://$MODULE_DIR$/.pub" />
-      <excludeFolder url="file://$MODULE_DIR$/build" />
-      <excludeFolder url="file://$MODULE_DIR$/example/.pub" />
-      <excludeFolder url="file://$MODULE_DIR$/example/build" />
-    </content>
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Dart Packages" level="project" />
-    <orderEntry type="library" name="Dart SDK" level="project" />
-    <orderEntry type="library" name="Flutter Plugins" level="project" />
-  </component>
-</module>
\ No newline at end of file