安卓录屏保存成MP4

/** * Created by leilu on 2017/12/25. */@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)public class MyScreenActivity extends Activity {    private static final int REQUEST_CODE = 10;    private MediaProjectionManager mediaProjectionManager;    private MediaCodec mediaCodec;    private MediaMuxer mediaMuxer;    private VirtualDisplay virtualDisplay;    private int videoTrackIndex;    private boolean isRecording;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_my_screen);    }    public void start(View view) {        mediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);        Intent intent = mediaProjectionManager.createScreenCaptureIntent();        startActivityForResult(intent, REQUEST_CODE);    }    public void stop(View view) {        isRecording = false;    }    @Override    protected void onActivityResult(int requestCode, final int resultCode, final Intent data) {        if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {            new Thread(new Runnable() {                @Override                public void run() {                    startRecord(resultCode, data);                }            }).start();            moveTaskToBack(true);        }    }    private void startRecord(int resultCode, Intent data) {        MediaProjection mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data);        Surface surface = init();        if (surface == null) {            throw new RuntimeException("不能录屏！");        }        virtualDisplay = mediaProjection.createVirtualDisplay(getClass().getName(), getScreenWidth(), getScreenHeight(), getResources().getDisplayMetrics().densityDpi                , DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC, surface, null, null);        isRecording = true;        MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();        while (isRecording) {            int outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 10000);            if (outputBufferIndex > 0) {                ByteBuffer byteBuffer = mediaCodec.getOutputBuffer(outputBufferIndex);                mediaMuxer.writeSampleData(videoTrackIndex, byteBuffer, bufferInfo);                mediaCodec.releaseOutputBuffer(outputBufferIndex, false);            } else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {                resetOutputFormat();            }        }        release();    }    private void resetOutputFormat() {        MediaFormat mediaFormat = mediaCodec.getOutputFormat();        videoTrackIndex = mediaMuxer.addTrack(mediaFormat);        mediaMuxer.start();    }    private void release() {        if (mediaCodec != null) {            mediaCodec.stop();            mediaCodec.release();        }        if (virtualDisplay != null) {            virtualDisplay.release();        }        if (mediaMuxer != null) {            mediaMuxer.release();        }    }    private Surface init() {        Surface surface = null;        try {            MediaFormat mediaFormat = MediaFormat.createVideoFormat(MediaFormat.MIMETYPE_VIDEO_AVC, getScreenWidth(), getScreenHeight());            mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);            mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, 96000);            mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, 30);            mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 5);            mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 5);            mediaCodec = MediaCodec.createEncoderByType(MediaFormat.MIMETYPE_VIDEO_AVC);            mediaCodec.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);            surface = mediaCodec.createInputSurface();            mediaCodec.start();            mediaMuxer = new MediaMuxer("/sdcard/screen.mp4", MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);        } catch (IOException e) {            e.printStackTrace();        }        return surface;    }    private int getScreenWidth() {        return getResources().getDisplayMetrics().widthPixels;    }    private int getScreenHeight() {        return getResources().getDisplayMetrics().heightPixels;    }}