support androidX & update readme

README.md

@@ -14,8 +14,32 @@ To use this plugin, add `agora_rtm` as a [dependency in your pubspec.yaml file](
 
 * See the [example](example) directory for a sample app using AgoraRtm.
 
+## Error handling
+
+### Release crash
+
+it causes by code obfuscation because of flutter set `android.enableR8=true` by the default
+
+Add the following line in the **app/proguard-rules.pro** file to prevent code obfuscation:
+```
+-keep class io.agora.**{*;}
+```
+
 ## Note
 
+### Flutter 1.12
+
+if your MainActivity extends `io.flutter.embedding.android.FlutterActivity`
+
+please remove this line
+```
+GeneratedPluginRegistrant.registerWith(this)
+```
+
+[you can refer to official documents](https://flutter.dev/docs/development/packages-and-plugins/plugin-api-migration)
+
+### abiFilters
+
 Agora RTM sdk contain arm64 architecture, but Flutter is not shipping “libflutter.so” in arm64 currently. You need add "abiFilters" in *build.gradle* if you need build release apk.
 
 ```

android/build.gradle

@@ -32,7 +32,7 @@ android {
     }
     defaultConfig {
         minSdkVersion 16
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     lintOptions {
         disable 'InvalidPackage'

example/android/app/build.gradle

@@ -43,7 +43,7 @@ android {
         targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
@@ -62,6 +62,6 @@ flutter {
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     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.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
 }

example/android/app/src/main/kotlin/io/agora/agora_rtm_example/MainActivity.kt

@@ -5,9 +5,9 @@ import android.os.Bundle
 import io.flutter.app.FlutterActivity
 import io.flutter.plugins.GeneratedPluginRegistrant
 
-class MainActivity: FlutterActivity() {
-  override fun onCreate(savedInstanceState: Bundle?) {
-    super.onCreate(savedInstanceState)
-    GeneratedPluginRegistrant.registerWith(this)
-  }
+class MainActivity : FlutterActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        GeneratedPluginRegistrant.registerWith(this)
+    }
 }

example/android/build.gradle

@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
+        classpath 'com.android.tools.build:gradle:3.3.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }

example/android/gradle.properties

@@ -1 +1,4 @@
 org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true
+android.useAndroidX=true
+android.enableJetifier=true