View view = activity.getWindow().getDecorView();
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    Bitmap bmp = view.getDrawingCache();
    DisplayMetrics dm = new DisplayMetrics();
    activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
    Bitmap ret = Bitmap.createBitmap(bmp, 0, 0, dm.widthPixels, dm.heightPixels);
    view.destroyDrawingCache();

 Intent intent = new Intent(this, ScreenService.class);
 bindService(intent, mServiceConnection, BIND_AUTO_CREATE);

 public void onServiceConnected(ComponentName className, IBinder service) {
       DisplayMetrics metrics = new DisplayMetrics();
       getWindowManager().getDefaultDisplay().getMetrics(metrics);
       ScreenService.RecordBinder binder = (ScreenService.RecordBinder) service;
       recordService = binder.getRecordService();
       recordService.setConfig(metrics.widthPixels, metrics.heightPixels, metrics.densityDpi);
       mButton.setEnabled(true);
       mButton.setText(recordService.isRunning() ? "结束" : "开始");
 }

 Intent captureIntent = projectionManager.createScreenCaptureIntent();
 startActivityForResult(captureIntent, RECORD_REQUEST_CODE);

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     if (requestCode == RECORD_REQUEST_CODE && resultCode == RESULT_OK) {

       //######## 截屏逻辑 ########
       mediaProjection = projectionManager.getMediaProjection(resultCode, data);
       recordService.setMediaProject(mediaProjection);
       recordService.initImageReader();

     }
 }

 @Override
 public void onClick(View view) {

  //######## 截屏逻辑 ########
   Bitmap bitmap = recordService.getBitmap();
   mImageView.setImageBitmap(bitmap);
 }

 private void initRecorder() {
     mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
     mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
     mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
     mediaRecorder.setOutputFile(
         getSavePath() + System.currentTimeMillis() + ".mp4");
     mediaRecorder.setVideoSize(width, height);
     mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
     mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
     mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024);
     mediaRecorder.setVideoFrameRate(30);
     try {
       mediaRecorder.prepare();
     } catch (IOException e) {
       e.printStackTrace();
     }
 }

mediaRecorder.start();

public class ScreenService extends Service {
private MediaRecorder mediaRecorder;
private VirtualDisplay virtualDisplay;
private boolean running;
private int width = 720;
private int height = 1080;
private int dpi;
private ImageReader mImageReader;
private MediaProjection mediaProjection;

 @Override
 public IBinder onBind(Intent intent) {
   return new RecordBinder();
 }


 @Override
 public void onCreate() {
   super.onCreate();
   running = false;
   mediaRecorder = new MediaRecorder();
 }


 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {
   return super.onStartCommand(intent, flags, startId);
 }


 @Override
 public void onDestroy() {
   super.onDestroy();
 }


 public void setMediaProject(MediaProjection project) {
   mediaProjection = project;
 }


 public boolean isRunning() {
   return running;
 }


 public void setConfig(int width, int height, int dpi) {
   this.width = width;
   this.height = height;
   this.dpi = dpi;
 }


 /**
 * 开始录屏
 *
 * @return true
 */
 public boolean startRecord() {
   if (mediaProjection == null || running) {
     return false;
   }
   initRecorder();
   createVirtualDisplay();
   mediaRecorder.start();
   running = true;
   return true;
 }


 /**
 * 结束录屏
 *
 * @return true
 */
 public boolean stopRecord() {
   if (!running) {
     return false;
   }
   running = false;
   mediaRecorder.stop();
   mediaRecorder.reset();
   virtualDisplay.release();
   mediaProjection.stop();

   return true;
 }


 public void setMediaProjection(MediaProjection mediaProjection) {
   this.mediaProjection = mediaProjection;
 }


 /**
 * 初始化ImageRead参数
 */
 public void initImageReader() {
   if (mImageReader == null) {
     int maxImages = 2;
     mImageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, maxImages);
     createImageVirtualDisplay();
   }
 }


 /**
 * 创建一个录屏 Virtual
 */

 private void createVirtualDisplay() {
   virtualDisplay = mediaProjection
       .createVirtualDisplay("mediaprojection", width, height, dpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mediaRecorder
           .getSurface(), null, null);
 }


 /**
 * 创建一个ImageReader Virtual
 */
 private void createImageVirtualDisplay() {
   virtualDisplay = mediaProjection
       .createVirtualDisplay("mediaprojection", width, height, dpi,
           DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mImageReader
           .getSurface(), null, null);
 }


 /**
 * 初始化保存屏幕录像的参数
 */
 private void initRecorder() {
   mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
   mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
   mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
   mediaRecorder.setOutputFile(
       getSavePath() + System.currentTimeMillis() + ".mp4");
   mediaRecorder.setVideoSize(width, height);
   mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
   mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
   mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024);
   mediaRecorder.setVideoFrameRate(30);
   try {
     mediaRecorder.prepare();
   } catch (IOException e) {
     e.printStackTrace();
   }
 }


 /**
 * 获取一个保存屏幕录像的路径
 *
 * @return path
 */
 public String getSavePath() {
   if (Environment.getExternalStorageState()
          .equals(Environment.MEDIA_MOUNTED)) {
     String rootDir = Environment.getExternalStorageDirectory()
                   .getAbsolutePath() + "/" +
         "ScreenRecord" + "/";

     File file = new File(rootDir);
     if (!file.exists()) {
       if (!file.mkdirs()) {
         return null;
       }
     }
     return rootDir;
   } else {
     return null;
   }
 }


 /**
 * 请求完权限后马上获取有可能为null，可以通过判断is null来重复获取。
 */
 public Bitmap getBitmap() {
   Bitmap bitmap = cutoutFrame();
   if (bitmap == null) {
     getBitmap();
   }
   return bitmap;
 }


 /**
 * 通过底层来获取下一帧的图像
 *
 * @return bitmap
 */
 public Bitmap cutoutFrame() {
   Image image = mImageReader.acquireLatestImage();
   if (image == null) {
     return null;
   }
   int width = image.getWidth();
   int height = image.getHeight();
   final Image.Plane[] planes = image.getPlanes();
   final ByteBuffer buffer = planes[0].getBuffer();
   int pixelStride = planes[0].getPixelStride();
   int rowStride = planes[0].getRowStride();
   int rowPadding = rowStride - pixelStride * width;
   Bitmap bitmap = Bitmap.createBitmap(width +
       rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);
   bitmap.copyPixelsFromBuffer(buffer);
   return Bitmap.createBitmap(bitmap, 0, 0, width, height);
 }


 public class RecordBinder extends Binder {
   public ScreenService getRecordService() {
     return ScreenService.this;
   }
 }