AndroidWebRTC实现屏幕共享
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) {
audioManager = (AudioManager) SystemService(Context.AUDIO_SERVICE);
bluetoothAdapter = DefaultAdapter();
if (Build.VERSION.SDK_INT >= 21) {
mediaProjectionManager = (MediaProjectionManager) SystemService(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 = ateScreenCaptureIntent();
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) {
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() {
}
});
}
}
if (videoSource == null) {
Log.e(TAG, "startShareScreen----->createVideoSource");
videoSource = createVideoSource(shareScreenCapture);
}截屏
Log.e(TAG, "startShareScreen----->startCapture");
shareScreenCapture.initialize(surfaceTextureHelper, context, CapturerObserver());
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。

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