[Android]update sdk to 4.0.0-beta.2

Author: xgfd3

Android/APIExample/apiexample.jks

@@ -13,12 +13,33 @@ android {
         versionName "1.0"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        //ndk {
+        //    abiFilters 'armeabi-v7a','x86'
+        //}
+    }
+
+    signingConfigs {
+        release {
+            storeFile new File(rootProject.rootDir.absolutePath + "/apiexample.jks")
+            storePassword '123456'
+            keyAlias 'APIExample'
+            keyPassword '123456'
+        }
     }
 
     buildTypes {
+        debug {
+            minifyEnabled false
+            signingConfig signingConfigs.release
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+
         release {
             minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            shrinkResources false
+            zipAlignEnabled true
+            signingConfig signingConfigs.release
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
 
@@ -32,11 +53,20 @@ android {
             jniLibs.srcDirs = ['src/main/jniLibs']
         }
     }
+
+    applicationVariants.all {
+        variant ->
+            variant.outputs.all { output ->
+                outputFileName = new File("APIExample_" + defaultConfig.versionName + "_" +
+                        new Date().format("yyyy-MM-dd") + "_" +
+                        buildType.name + ".apk")
+            }
+    }
 }
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
-    implementation 'io.agora.rtc:agora-full-beta:4.0.0-beta.1'
+    implementation 'io.agora.rtc:agora-full-beta:4.0.0-beta.2'
 
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

Android/APIExample/app/build.gradle

@@ -1,5 +1,7 @@
 package io.agora.api.example.examples.advanced;
 
+import static io.agora.api.example.common.model.Examples.ADVANCED;
+
 import android.content.Context;
 import android.os.Bundle;
 import android.os.Handler;
@@ -28,17 +30,12 @@
 import io.agora.api.example.annotation.Example;
 import io.agora.api.example.common.BaseFragment;
 import io.agora.api.example.utils.CommonUtil;
-import io.agora.base.VideoFrame;
+import io.agora.rtc2.ChannelMediaOptions;
 import io.agora.rtc2.Constants;
 import io.agora.rtc2.IAudioFrameObserver;
 import io.agora.rtc2.IRtcEngineEventHandler;
-import io.agora.rtc2.RtcConnection;
 import io.agora.rtc2.RtcEngine;
-import io.agora.rtc2.ChannelMediaOptions;
 import io.agora.rtc2.RtcEngineConfig;
-import io.agora.rtc2.video.IVideoFrameObserver;
-
-import static io.agora.api.example.common.model.Examples.ADVANCED;
 
 /**
  * This demo demonstrates how to make a one-to-one voice call
@@ -339,6 +336,11 @@ public boolean onMixedAudioFrame(String channel, int audioFrameType, int samples
             return false;
         }
 
+        @Override
+        public boolean onEarMonitoringAudioFrame(int type, int samplesPerChannel, int bytesPerSample, int channels, int samplesPerSec, ByteBuffer buffer, long renderTimeMs, int avsync_type) {
+            return false;
+        }
+
         @Override
         public boolean onPlaybackAudioFrameBeforeMixing(String channel, int uid, int audioFrameType, int samples, int bytesPerSample, int channels, int samplesPerSec, ByteBuffer byteBuffer, long renderTimeMs, int bufferLength) {
             return false;