AndroidWebRTC实现屏幕共享

⼀、WebRTC实现简单的屏幕共享

　　屏幕共享原理：其实就还是利⽤系统提供的录屏服务，把录制好的屏幕内容通通过P2P发送给对等端，让对等端能够看到分享者的屏幕。其实对于分享者来说是推流，对于观看分享的端来说就是拉取视频流⼆、代码演⽰　　1.初始化截屏服务

//屏幕截取服务

private MediaProjectionManager mediaProjectionManager = null;

private DeviceManager(Context context) { this.context = context;

audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (Build.VERSION.SDK_INT >= 21) {

mediaProjectionManager = (MediaProjectionManager) context.getSystemService(Context.MEDIA_PROJECTION_SERVICE); } else {

Toast.makeText(context, \"您的设备不⽀持屏幕共享\", Toast.LENGTH_SHORT).show(); } }

　　2.启动Android系统的屏幕共享　　

/**

* 开启屏幕截屏，调⽤此⽅法后会弹框提⽰⽤户开始截屏 * @param activity */

public void startScreenCapture(Activity activity) { if(mediaProjectionManager == null){

Toast.makeText(context, \"截屏服务不可⽤\", Toast.LENGTH_SHORT).show(); return; }

Intent intent = null;

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) { intent = mediaProjectionManager.createScreenCaptureIntent();

activity.startActivityForResult(intent, SCREEN_CAPTURE_REQUEST_CODE); } }

　　3.启动系统的屏幕共享后会再当前Activity的onActivityResult中收到回调

@Override

public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data);

if (requestCode == DeviceManager.SCREEN_CAPTURE_REQUEST_CODE) { rtcClient.startShareScreen(data); } }

　　rtcClient.startShareScreen(data)　　

/**

* 开始分享屏幕 *

* @param intent 分享屏幕创建的intent，⽤于创建ScreenCaptureAndroid */

public void startShareScreen(Intent intent) { Log.e(TAG, \"startShareScreen----->start\"); //创建屏幕捕获

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { if (shareScreenCapture == null) {

shareScreenCapture = new ScreenCapturerAndroid(intent, new MediaProjection.Callback() { @Override

public void onStop() { super.onStop(); } }); } }

if (videoSource == null) {

Log.e(TAG, \"startShareScreen----->createVideoSource\"); videoSource = createVideoSource(shareScreenCapture); }

Log.e(TAG, \"startShareScreen----->startCapture\");

shareScreenCapture.initialize(surfaceTextureHelper, context, videoSource.getCapturerObserver()); shareScreenCapture.startCapture(480, 640, 30);

if (videoTrack == null) {

Log.e(TAG, \"startShareScreen----->createVideoTrack\"); videoTrack = createVideoTrack(videoSource); }

//将视频加⼊媒体流

Log.e(TAG, \"startShareScreen----->createMediaStream\"); mediaStream = createMediaStream(); mediaStream.addTrack(videoTrack);

Log.e(TAG, \"startShareScreen----->end\"); }

　　其实除了前⼏步和P2P通信不⼀样外，后⼏步都是⼀样的：都是先创建⼀个VideoCapture，然后调⽤其startCapture⽅法--->创建VideoTrack--->创建mediaStrea--->然后将videoTrack加⼊mediaStream。