在Android中录制,保存和播放视频

private static final String TAG = "VideoRecorderActivity";

private static final int REQUEST_CODE = 1;

private static final String DEFAULT_VIDEO_PATH = "video.mp4";

private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss", Locale.US);

private MediaProjectionManager mediaProjectionManager;

private MediaProjection mediaProjection;

private DisplayMetrics displayMetrics;

private int screenWidth;

private int screenHeight;

private FrameLayout videoView;

private SurfaceView surfaceView;

private CameraDevice cameraDevice;

private CameraCaptureSession captureSession;

private CaptureRequest.Builder captureRequestBuilder;

private Surface surface;

private boolean isPreviewRunning;

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_video_recorder);

    mediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);

    displayMetrics = getResources().getDisplayMetrics();

    screenWidth = displayMetrics.widthPixels;

    screenHeight = displayMetrics.heightPixels;

    videoView = findViewById(R.id.video_view);

    surfaceView = findViewById(R.id.surface_view);

    findViewById(R.id.record_button).setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

            startRecording();

        }

    });

    findViewById(R.id.stop_button).setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {

            stopRecording();

        }

    });

}

private void startRecording() {

    stopRecording(); // 先停止录制

    Intent intent = mediaProjectionManager.createScreenCaptureIntent();

    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

    startActivityForResult(intent, REQUEST_CODE);

}

private void stopRecording() {

    if (captureSession != null) {

        captureSession.close();

        captureSession = null;

    }

    if (cameraDevice != null) {

        cameraDevice.close();

        cameraDevice = null;

    }

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == REQUEST_CODE) {

        if (resultCode == RESULT_OK) {

            Bundle extras = data.getExtras();

            Bitmap bitmap = extras.getParcelable("data");

            videoView.setVideoPath(getFilename());

            videoView.setMediaController(new MediaController(this));

            videoView.requestFocus();

            videoView.start();

        } else {

            Toast.makeText(this, "Screen capture failed, please try again", Toast.LENGTH_SHORT).show();

        }

    }

}

private String getFilename() {

    File videoFolder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES), "Camera");

    if (!videoFolder.exists()) {

        videoFolder.mkdirs();

    }

    return videoFolder.getAbsolutePath() + "/" +