需求如下图 实现系统录屏功能 

frameworks/base/packages/SystemUI/src/com/android/systemui/screenrecord

涉及代码

ScreenRecordDialog # startBtn

RecordingService # startRecording# stopRecording

ScreenMediaRecorder # start # end  #save

1、点击开始录屏frameworks/base/packages/SystemUI/src/com/android/systemui/screenrecord/ScreenRecordDialog.java

 startBtn.setOnClickListener(v -> {if (mOnStartRecordingClicked != null) {// Note that it is important to run this callback before dismissing, so that the// callback can disable the dialog exit animation if it wants to.mOnStartRecordingClicked.run();}requestScreenCapture();dismiss();});

2、ScreenRecordDialog #requestScreenCapture核心代码实现功能 

private void requestScreenCapture() {Context userContext = mUserContextProvider.getUserContext();ScreenRecordingAudioSource audioMode = mAudioSwitch.isChecked()? (ScreenRecordingAudioSource) mOptions.getSelectedItem(): NONE;PendingIntent startIntent = PendingIntent.getForegroundService(userContext,RecordingService.REQUEST_CODE,RecordingService.getStartIntent(userContext, Activity.RESULT_OK,audioMode.ordinal()),PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);PendingIntent stopIntent = PendingIntent.getService(userContext,RecordingService.REQUEST_CODE,RecordingService.getStopIntent(userContext),PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);mController.startCountdown(DELAY_MS, INTERVAL_MS, startIntent, stopIntent);}
}

3、RecordingService 中实现开始录屏功能 代码如下图所示

 case ACTION_START:mAudioSource = ScreenRecordingAudioSource.values()[intent.getIntExtra(EXTRA_AUDIO_SOURCE, 0)];Log.d(TAG, "recording with audio source" + mAudioSource);mRecorder = new ScreenMediaRecorder(mUserContextTracker.getUserContext(),currentUserId,mAudioSource,this);if (startRecording()) {updateState(true);createRecordingNotification();mUiEventLogger.log(Events.ScreenRecordEvent.SCREEN_RECORD_START);} else {updateState(false);createErrorNotification();stopForeground(true);stopSelf();return Service.START_NOT_STICKY;}break;

4、ScreenMediaRecorder 调用start方法开始录屏 

  * Start screen recording*/void start() throws IOException, RemoteException, RuntimeException {Log.d(TAG, "start recording");prepare();mMediaRecorder.start();recordInternalAudio();}

5、ScreenMediaRecorder停止录屏 调用代码路径 

/*** End screen recording*/void end() {mMediaRecorder.stop();mMediaRecorder.release();mInputSurface.release();mVirtualDisplay.release();mMediaProjection.stop();mMediaRecorder = null;mMediaProjection = null;stopInternalAudioRecording();Log.d(TAG, "end recording");}

6、保存录屏视频代码 如下图所示

/*** Store recorded video*/protected SavedRecording save() throws IOException {String fileName = new SimpleDateFormat("'screen-'yyyyMMdd-HHmmss'.mp4'").format(new Date());ContentValues values = new ContentValues();values.put(MediaStore.Video.Media.DISPLAY_NAME, fileName);values.put(MediaStore.Video.Media.MIME_TYPE, "video/mp4");values.put(MediaStore.Video.Media.DATE_ADDED, System.currentTimeMillis());values.put(MediaStore.Video.Media.DATE_TAKEN, System.currentTimeMillis());ContentResolver resolver = mContext.getContentResolver();Uri collectionUri = MediaStore.Video.Media.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY);Uri itemUri = resolver.insert(collectionUri, values);Log.d(TAG, itemUri.toString());if (mAudioSource == MIC_AND_INTERNAL || mAudioSource == INTERNAL) {try {Log.d(TAG, "muxing recording");File file = File.createTempFile("temp", ".mp4",mContext.getCacheDir());mMuxer = new ScreenRecordingMuxer(MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4,file.getAbsolutePath(),mTempVideoFile.getAbsolutePath(),mTempAudioFile.getAbsolutePath());mMuxer.mux();mTempVideoFile.delete();mTempVideoFile = file;} catch (IOException e) {Log.e(TAG, "muxing recording " + e.getMessage());e.printStackTrace();}}// Add to the mediastoreOutputStream os = resolver.openOutputStream(itemUri, "w");Files.copy(mTempVideoFile.toPath(), os);os.close();if (mTempAudioFile != null) mTempAudioFile.delete();DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();Size size = new Size(metrics.widthPixels, metrics.heightPixels);SavedRecording recording = new SavedRecording(itemUri, mTempVideoFile, size);mTempVideoFile.delete();return recording;}

到这里基本结束了，转载请注明出处Android高通 12/13 录屏流程代码位置-CSDN博客，谢谢！