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public class ScreenCaptureActivity extends Activity { private static final String TAG = ScreenCaptureActivity.class.getName(); private MediaProjectionManager mMediaProjectionManager; private int REQUEST_MEDIA_PROJECTION = 1; private SimpleDateFormat dateFormat; private String pathImage; private WindowManager mWindowManager; private ImageReader mImageReader; private MediaProjection mMediaProjection; private int mResultCode; private Intent mResultData; private VirtualDisplay mVirtualDisplay; private String strDate; private int windowWidth; private int windowHeight; private String nameImage; private int mScreenDensity; @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mMediaProjectionManager = (MediaProjectionManager) getApplication().getSystemService(Context.MEDIA_PROJECTION_SERVICE); createVirtualEnvironment(); startActivityForResult(mMediaProjectionManager.createScreenCaptureIntent(), REQUEST_MEDIA_PROJECTION); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_MEDIA_PROJECTION) {  if (resultCode != Activity.RESULT_OK) {  return;  } else if (data != null && resultCode != 0) {  mResultCode = resultCode;  mResultData = data;  startVirtual();  new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {   @Override   public void run() {   startCapture();   }  },100);  } } } @RequiresApi(api = Build.VERSION_CODES.KITKAT) private void createVirtualEnvironment() { dateFormat = new SimpleDateFormat("yyyy_MM_dd_hh_mm_ss"); strDate = dateFormat.format(new Date()); pathImage = Environment.getExternalStorageDirectory().getPath() + "/Pictures/"; nameImage = pathImage + strDate + ".png"; mMediaProjectionManager = (MediaProjectionManager) getApplication().getSystemService(Context.MEDIA_PROJECTION_SERVICE); mWindowManager = (WindowManager) getApplication().getSystemService(Context.WINDOW_SERVICE); windowWidth = mWindowManager.getDefaultDisplay().getWidth(); windowHeight = mWindowManager.getDefaultDisplay().getHeight(); DisplayMetrics metrics = new DisplayMetrics(); mWindowManager.getDefaultDisplay().getMetrics(metrics); mScreenDensity = metrics.densityDpi; mImageReader = ImageReader.newInstance(windowWidth, windowHeight, 0x1, 2); //ImageFormat.RGB_565 Log.i(TAG, "prepared the virtual environment"); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) public void startVirtual() { if (mMediaProjection != null) {  Log.i(TAG, "want to display virtual");  virtualDisplay(); } else {  Log.i(TAG, "start screen capture intent");  Log.i(TAG, "want to build mediaprojection and display virtual");  setUpMediaProjection();  virtualDisplay(); } } @TargetApi(Build.VERSION_CODES.LOLLIPOP) public void setUpMediaProjection() { mMediaProjection = mMediaProjectionManager.getMediaProjection(mResultCode, mResultData); Log.i(TAG, "mMediaProjection defined"); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) private void virtualDisplay() { mVirtualDisplay = mMediaProjection.createVirtualDisplay("screen-mirror",  windowWidth, windowHeight, mScreenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,  mImageReader.getSurface(), null, null); Log.i(TAG, "virtual displayed"); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) private void startCapture() { strDate = dateFormat.format(new java.util.Date()); nameImage = pathImage + strDate + ".png"; Image image = mImageReader.acquireLatestImage(); 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); bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height); image.close(); Log.i(TAG, "image data captured"); //保存截屏结果，如果要裁剪图片，在这里处理bitmap if (bitmap != null) {  try {  File fileImage = new File(nameImage);  if (!fileImage.exists()) {   fileImage.createNewFile();   Log.i(TAG, "image file created");  }  FileOutputStream out = new FileOutputStream(fileImage);  if (out != null) {   bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);   out.flush();   out.close();   Intent media = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);   Uri contentUri = Uri.fromFile(fileImage);   media.setData(contentUri);   this.sendBroadcast(media);   Log.i(TAG, "screen image saved");  }  } catch (FileNotFoundException e) {  e.printStackTrace();  } catch (IOException e) {  e.printStackTrace();  } } } @TargetApi(Build.VERSION_CODES.LOLLIPOP) private void tearDownMediaProjection() { if (mMediaProjection != null) {  mMediaProjection.stop();  mMediaProjection = null; } Log.i(TAG, "mMediaProjection undefined"); }}

第三步、对截图进行裁剪

根据第一步得到的截图区域mRect对第二步中得到的截屏结果bitmap进行裁剪：

if (mRect != null) { if (mRect.left < 0) mRect.left = 0; if (mRect.right < 0) mRect.right = 0; if (mRect.top < 0) mRect.top = 0; if (mRect.bottom < 0) mRect.bottom = 0; int cut_width = Math.abs(mRect.left - mRect.right); int cut_height = Math.abs(mRect.top - mRect.bottom); if (cut_width > 0 && cut_height > 0) { Bitmap cutBitmap = Bitmap.createBitmap(bitmap, mRect.left, mRect.top, cut_width, cut_height);}

需要注意的是，在调用系统截屏功能的时候，如果手机有NavigationBar（虚拟导航栏），windowHeight的取值就是不包括NavigationBar的高度的，如果不进行调整，就会导致截屏被压缩。如何获取屏幕的真实高度，可以参考Android如何判断NavigationBar是否显示（获取屏幕真实的高度）。

而且NavigationBar还会导致截屏的结果出现边框，边框的颜色是透明的，原因是第二步代码中的rowPadding！=0，截屏如下图所示：

那么如果我们想要对截图的结果进行保存或者裁剪，就必须要去除边框，找出真正的内容区域，也就是在第一个不透明的像素和最后一个不透明像素之间的内容，然后才能对得到的区域进行第三步的裁剪，代码如下：

int[] pixel=new int[width];bitmap.getPixels(pixel,0,width ,0,0,width,1);int leftPadding=0;int rightPadding=width;for (int i=0;i<pixel.length;i++){ if (pixel[i]!=0){ leftPadding=i; break; }}for (int i=pixel.length-1;i>=0;i--){ if (pixel[i]!=0){ rightPadding=i; break; }}bitmap=Bitmap.createBitmap(bitmap,leftPadding, 0, rightPadding-leftPadding, height);

处理后的截图如下：

你可能会觉得既然是rowPadding！=0导致出现边框，而且边框只在右边，为什么不直接把右边rowPadding宽度的内容截掉呢？其实是因为如果不调整windowHeight，就会在左边也产生框，所以才用了上面的方法。

完整代码可以参考Bigbang项目的MarkSizeView类、ScreenCaptureActivity类和ScreenCapture类。

(责任编辑：admin)