Agora SDK 在Android中的使用(在线视频通话)

|---app
    |---.gitignore
    |---build.gradle
    |---libs
        |---PLACEHOLDER
    |---proguard-rules.pro
    |---src
        |---main
            |---AndroidManifest.xml
            |---java
                |---io
                    |---agora
                        |---tutorials1v1vcall
                            |---VideoChatViewActivity.java
            |---jniLibs
                |---arm64-v8a
                    |---PLACEHOLDER
                |---armeabi-v7a
                    |---PLACEHOLDER
                |---x86
                    |---PLACEHOLDER
            |---res
                |---drawable-xxxhdpi
                    |---btn_end_call.png
                    |---btn_mute.png
                    |---btn_switch_camera.png
                    |---btn_video.png
                    |---btn_voice.png
                    |---ic_launcher.png
                |---layout
                    |---activity_video_chat_view.xml
                |---values
                    |---colors.xml
                    |---dimens.xml
                    |---strings.xml
                    |---styles.xml
|---build.gradle
|---gradle
    |---wrapper
        |---gradle-wrapper.jar
        |---gradle-wrapper.properties
|---gradle.properties
|---gradlew
|---gradlew.bat
|---images
    |---ActivityViewChat.png
|---LICENSE.md
|---README.md
|---README.zh.md
|---settings.gradle

---->[settings.gradle]----------------看一下项目包含的模块------------
include ':app'

---->[build.gradle]----------------看一下项目的一些信息------------
buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'
    }
}
allprojects {
    repositories {
        jcenter()
        google()
    }
}
task clean(type: Delete) {
    delete rootProject.buildDir
}

---->[app/build.gradle]----------------看一下项目的具体信息------------
apply plugin: 'com.android.application'
android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "io.agora.tutorials1v1vcall"
        minSdkVersion 16
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {//这里是jniLibs的目录
        main {
            jniLibs.srcDirs = ['../../../libs']
        }
    }
}

dependencies {//这里是依赖
    implementation fileTree(dir: '../../../libs', include: ['*.jar']) // DO NOT CHANGE, CI may needs it when packaging
    implementation 'com.android.support:appcompat-v7:26.1.0'
}

<activity
    android:name=".VideoChatViewActivity"
    android:screenOrientation="sensorPortrait"
    android:theme="@style/FullScreenVideoTheme">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

|--- 权限 ------------
<!--网络权限-->
<uses-permission android:name="android.permission.INTERNET"/>
<!--录音权限-->
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<!--更改录音设置-->
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
<!--网络状态权限-->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<!--相机权限-->
<uses-permission android:name="android.permission.CAMERA"/>
<!--蓝牙权限-->
<uses-permission android:name="android.permission.BLUETOOTH"/>
<!--SD卡写权限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

---->[成员变量]----------------------------------
private static final int PERMISSION_REQ_ID = 22;
//WRITE_EXTERNAL_STORAGE 权限只是为了保存日志到SD卡
private static final String[] REQUESTED_PERMISSIONS = {
        Manifest.permission.RECORD_AUDIO,//录音权限
        Manifest.permission.CAMERA,//相机权限
        Manifest.permission.WRITE_EXTERNAL_STORAGE//SD卡写权限
};

if (checkSelfPermission(REQUESTED_PERMISSIONS[0], PERMISSION_REQ_ID) &&
        checkSelfPermission(REQUESTED_PERMISSIONS[1], PERMISSION_REQ_ID) &&
        checkSelfPermission(REQUESTED_PERMISSIONS[2], PERMISSION_REQ_ID)) {
    //执行到此处说明已有权限成功     
    initAgoraEngineAndJoinChannel();
}

/**
 * 检查权限的方法
 *
 * @param permission  权限
 * @param requestCode 请求码
 * @return 是否拥有权限
 */
public boolean checkSelfPermission(String permission, int requestCode) {
    Log.i(LOG_TAG, "checkSelfPermission " + permission + " " + requestCode);
    if (ContextCompat.checkSelfPermission(this, permission) 
            != PackageManager.PERMISSION_GRANTED) {
        //发送权限请求
        ActivityCompat.requestPermissions(this, REQUESTED_PERMISSIONS, requestCode);
        return false;
    }
    return true;
}

@Override
public void onRequestPermissionsResult(
        int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    Log.i(LOG_TAG, "onRequestPermissionsResult " + grantResults[0] + " " + requestCode);
    switch (requestCode) {
        case PERMISSION_REQ_ID: {//请求码
            if (grantResults[0] != PackageManager.PERMISSION_GRANTED ||
                    grantResults[1] != PackageManager.PERMISSION_GRANTED ||
                    grantResults[2] != PackageManager.PERMISSION_GRANTED) {
                //三个权限有任意的未被允许,弹吐司，退出
                showLongToast("Need permissions " +
                        Manifest.permission.RECORD_AUDIO + "/" +
                        Manifest.permission.CAMERA + "/" +
                        Manifest.permission.WRITE_EXTERNAL_STORAGE);
                finish();
                break;
            }
            //执行到此处说明用户已允许权限
            initAgoraEngineAndJoinChannel();
            break;
        }
    }
}

/**
 * 初始化Agora引擎和连接频道
 */
private void initAgoraEngineAndJoinChannel() {
    initializeAgoraEngine();//初始化Agora引擎
    setupVideoProfile();//设置视频信息
    setupLocalVideo();//设置本地的视频窗
    joinChannel();//连接频道
}

/**
 * 初始化Agora引擎
 */
private void initializeAgoraEngine() {
    try {
        mRtcEngine = RtcEngine.create(//实例化Rtc引擎
            getBaseContext(),//传入Context 
            getString(R.string.agora_app_id), //传入APP ID
            mRtcEventHandler);//RTC事件处理器
    } catch (Exception e) {//发生异常时捕获异常
        Log.e(LOG_TAG, Log.getStackTraceString(e));
        throw new RuntimeException("NEED TO check rtc sdk init fatal error\n" + Log.getStackTraceString(e));
    }
}

/**
 * 设置视频信息
 */
private void setupVideoProfile() {
    mRtcEngine.enableVideo();//启用视屏
    mRtcEngine.setVideoEncoderConfiguration(//视频解码配置
            new VideoEncoderConfiguration(//实例化对象
                    VideoEncoderConfiguration.VD_120x120,//尺寸
                    VideoEncoderConfiguration.FRAME_RATE.FRAME_RATE_FPS_15,//帧率
                    VideoEncoderConfiguration.STANDARD_BITRATE,//比特率
                    VideoEncoderConfiguration.ORIENTATION_MODE.ORIENTATION_MODE_FIXED_PORTRAIT));//旋转模式
}
|---关于VideoEncoderConfiguration对象---->[VideoEncoderConfiguration构造方法]------------------
 public VideoEncoderConfiguration(
 VideoEncoderConfiguration.VideoDimensions dimensions, //尺寸
 VideoEncoderConfiguration.FRAME_RATE frameRate,//帧率 
 int bitrate, //比特率
 VideoEncoderConfiguration.ORIENTATION_MODE orientationMode)//旋转模式

/**
 * 设置本地视频窗
 */
private void setupLocalVideo() {
    FrameLayout container = findViewById(R.id.local_video_view_container);//FrameLayout视图
    SurfaceView surfaceView = RtcEngine.CreateRendererView(getBaseContext());//创建SurfaceView
    surfaceView.setZOrderMediaOverlay(true);
    container.addView(surfaceView);
    mRtcEngine.setupLocalVideo(new VideoCanvas(surfaceView, VideoCanvas.RENDER_MODE_FIT, 0));
}

 /**
  * 连接到频道
  */
 private void joinChannel() {
     mRtcEngine.joinChannel(null, "demoChannel1", "Extra Optional Data", 0);
     // 如果你不指定 uid(第四参), 我们会为你生成一个 uid
 }

private final IRtcEngineEventHandler mRtcEventHandler = new IRtcEngineEventHandler() {
    @Override//已完成远端视频首帧解码回调。
    public void onFirstRemoteVideoDecoded(final int uid, int width, int height, int elapsed) {
        runOnUiThread(() -> setupRemoteVideo(uid));
    }
    @Override//远端用户（通信模式）/主播（直播模式）离开当前频道回调。
    public void onUserOffline(int uid, int reason) {
        runOnUiThread(() -> onRemoteUserLeft());
    }
    @Override//远端用户静音回调。
    public void onUserMuteVideo(final int uid, final boolean muted) {
        runOnUiThread(() -> onRemoteUserVideoMuted(uid, muted));
    }
};

/**
 * 根据uid设置远端视频
 * @param uid 唯一标识符
 */
private void setupRemoteVideo(int uid) {
    FrameLayout container = findViewById(R.id.remote_video_view_container);
    if (container.getChildCount() >= 1) {
        return;
    }
    SurfaceView surfaceView = RtcEngine.CreateRendererView(getBaseContext());
    container.addView(surfaceView);
    mRtcEngine.setupRemoteVideo(new VideoCanvas(surfaceView, VideoCanvas.RENDER_MODE_FIT, u
    surfaceView.setTag(uid); // 用uid为surfaceView打标签
    View tipMsg = findViewById(R.id.quick_tips_when_use_agora_sdk); // 隐藏文字UI
    tipMsg.setVisibility(View.GONE);
}

/**
 * 远端用户挂断
 */
private void onRemoteUserLeft() {
    FrameLayout container = findViewById(R.id.remote_video_view_container);
    container.removeAllViews();
    View tipMsg = findViewById(R.id.quick_tips_when_use_agora_sdk); // 显示文字UI
    tipMsg.setVisibility(View.VISIBLE);
}

/**
 * 远端用户静音
 * @param uid 标识符
 * @param muted 是否静音
 */
private void onRemoteUserVideoMuted(int uid, boolean muted) {
    FrameLayout container = findViewById(R.id.remote_video_view_container);
    SurfaceView surfaceView = (SurfaceView) container.getChildAt(0);
    Object tag = surfaceView.getTag();
    if (tag != null && (Integer) tag == uid) {
        surfaceView.setVisibility(muted ? View.GONE : View.VISIBLE);
    }
}

/**
 * 是否屏蔽视频
 * @param view
 */
public void onLocalVideoMuteClicked(View view) {
    ImageView iv = (ImageView) view;
    if (iv.isSelected()) {
        iv.setSelected(false);
        iv.clearColorFilter();
    } else {
        iv.setSelected(true);
        iv.setColorFilter(getResources().getColor(R.color.colorPrimary), PorterDuff.Mode.MULTIPLY);
    }
    mRtcEngine.muteLocalVideoStream(iv.isSelected());//核心的一句API,
    FrameLayout container = findViewById(R.id.local_video_view_container);
    SurfaceView surfaceView = (SurfaceView) container.getChildAt(0);
    surfaceView.setZOrderMediaOverlay(!iv.isSelected());
    surfaceView.setVisibility(iv.isSelected() ? View.GONE : View.VISIBLE);
}

/**
 * 是否静音
 * @param view
 */
public void onLocalAudioMuteClicked(View view) {
    ImageView iv = (ImageView) view;
    if (iv.isSelected()) {
        iv.setSelected(false);
        iv.clearColorFilter();
    } else {
        iv.setSelected(true);
        iv.setColorFilter(getResources().getColor(R.color.colorPrimary), PorterDuff.Mode.MULTIPLY);
    }
    mRtcEngine.muteLocalAudioStream(iv.isSelected());//核心的一句API,
}

/**
 * 切换摄像头
 * @param view
 */
public void onSwitchCameraClicked(View view) {
    mRtcEngine.switchCamera();
}

/**
 * 关闭
 * @param view
 */
public void onEncCallClicked(View view) {
    finish();
}

 @Override
 protected void onDestroy() {
     super.onDestroy();
     leaveChannel();//离开频道
     RtcEngine.destroy();//引擎销毁
     mRtcEngine = null;//引擎置空
 }

 /**
 * 离开频道
 */
private void leaveChannel() {
    mRtcEngine.leaveChannel();
}