解析Android截取手机屏幕两种实现方案

 public void printScreen(View view) {
    String imgPath = "/sdcard/test.png";
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    Bitmap bitmap = view.getDrawingCache();
    if (bitmap != null) {
      try {
        FileOutputStream out = new FileOutputStream(imgPath);
        bitmap.compress(Bitmap.CompressFormat.PNG, 100,
            out);
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }

 final MediaProjectionManager projectionManager = (MediaProjectionManager)
        getSystemService(Context.MEDIA_PROJECTION_SERVICE);
 Intent intent = projectionManager.createScreenCaptureIntent();
 startActivityForResult(intent, REQUEST_CODE);

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    handleScreenShotIntent(resultCode, data);
  }
  private void handleScreenShotIntent(int resultCode, Intent data) {

    onScreenshotTaskBegan();
    final MediaProjectionManager projectionManager = (MediaProjectionManager)
        getSystemService(Context.MEDIA_PROJECTION_SERVICE);
    final MediaProjection mProjection = projectionManager.getMediaProjection(resultCode, data);
    Point size = Utils.getScreenSize(this);
    final int mWidth = size.x;
    final int mHeight = size.y;
    final ImageReader mImageReader = ImageReader.newInstance(mWidth, mHeight, PixelFormat
        .RGBA_8888, 2);
    final VirtualDisplay display = mProjection.createVirtualDisplay("screen-mirror", mWidth,
        mHeight, DisplayMetrics.DENSITY_MEDIUM,
        DisplayManager.VIRTUAL_DISPLAY_FLAG_PRESENTATION, mImageReader.getSurface(),
        null, null);

    mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
      @Override
      public void onImageAvailable(ImageReader mImageReader) {

        Image image = null;
        try {
          image = mImageReader.acquireLatestImage();
          if (image != null) {
            final Image.Plane[] planes = image.getPlanes();
            if (planes.length > 0) {
              final ByteBuffer buffer = planes[0].getBuffer();
              int pixelStride = planes[0].getPixelStride();
              int rowStride = planes[0].getRowStride();
              int rowPadding = rowStride - pixelStride * mWidth;


              // create bitmap
              Bitmap bmp = Bitmap.createBitmap(mWidth + rowPadding / pixelStride,
                  mHeight, Bitmap.Config.ARGB_8888);
              bmp.copyPixelsFromBuffer(buffer);

              Bitmap croppedBitmap = Bitmap.createBitmap(bmp, 0, 0, mWidth, mHeight);

              saveBitmap(croppedBitmap);//保存图片

              if (croppedBitmap != null) {
                croppedBitmap.recycle();
              }
              if (bmp != null) {
                bmp.recycle();
              }
            }
          }

        } catch (Exception e) {
          e.printStackTrace();
        } finally {
          if (image != null) {
            image.close();
          }
          if (mImageReader != null) {
            mImageReader.close();
          }
          if (display != null) {
            display.release();
          }

          mImageReader.setOnImageAvailableListener(null, null);
          mProjection.stop();

          onScreenshotTaskOver();
        }

      }
    }, getBackgroundHandler());
  }