Android如何实现截屏功能
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介绍
Android 5.0以后开放的录屏API,取视频中的一帧数据,这样就可以实现截屏
步骤
在activity中授权,在service中完成初始化并截图,当然可以后台定时截图,但是6.0系统会有内存溢出的bug
1:build.gradle
compileSdkVersion 21 buildToolsVersion "27.0.3" defaultConfig { applicationId "com.aile.screenshot" multiDexEnabled true minSdkVersion 21 targetSdkVersion 21 versionCode 1 versionName "1.0" }
2:在activity中授权
public void requestCapturePermission() { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) { return; } MediaProjectionManager mediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE); startActivityForResult(mediaProjectionManager.createScreenCaptureIntent(), REQUEST_MEDIA_PROJECTION); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); switch (requestCode) { case REQUEST_MEDIA_PROJECTION: if (resultCode == RESULT_OK && data != null) { Service.setResultData(data); startService(new Intent(this, Service.class)); finish(); } break; } }
3:在service中初始化ImageReader,MediaProjection
private void createImageReader() { mImageReader = ImageReader.newInstance(mScreenWidth, mScreenHeight, PixelFormat.RGBA_8888, 1); } public void setUpMediaProjection() { mMediaProjection = getMediaProjectionManager().getMediaProjection(Activity.RESULT_OK, mResultData); } }
4:在service中完成截图重要步骤:
private void startScreenShot() { Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { startVirtual(); } }, 0); handler.postDelayed(new Runnable() { @Override public void run() { startCapture(); } }, 50); } public void startVirtual() { if (mMediaProjection != null) { virtualDisplay(); } else { setUpMediaProjection(); virtualDisplay(); } } private void virtualDisplay() { mVirtualDisplay = mMediaProjection.createVirtualDisplay("screen-mirror", mScreenWidth, mScreenHeight, mScreenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mImageReader.getSurface(), null, null); } //异常处理的核心 private void startCapture() { Image image = null; try { image = mImageReader.acquireLatestImage(); } catch (IllegalStateException e) { if (null != image) { image.close(); image = null; image = mImageReader.acquireLatestImage(); } } if (image == null) { startScreenShot(); } else { SaveTask mSaveTask = new SaveTask(); AsyncTaskCompat.executeParallel(mSaveTask, image); new Handler().postDelayed(new Runnable() { @Override public void run() { stopVirtual(); tearDownMediaProjection(); } }, 0); } } public class SaveTask extends AsyncTask{ @Override protected Bitmap doInBackground(Image... params) { if (params == null || params.length < 1 || params[0] == null) { return null; } Image image = params[0]; 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); //这就是初始截图 bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height); image.close(); return bitmap; } @Override protected void onPostExecute(final Bitmap bitmap) { super.onPostExecute(bitmap); //处理bitmap的业务代码 }
5:Bitmap转IS流,指定区域截图
// 将Bitmap转换成InputStream ByteArrayOutputStream bos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos); InputStream inputStream = new ByteArrayInputStream(bos.toByteArray()); //指定区域截图 Rect mRect = new Rect(51, 74, 58, 62); BitmapRegionDecoder bitmapRegionDecoder = BitmapRegionDecoder.newInstance(inputStream, true); Bitmap bm = bitmapRegionDecoder.decodeRegion(mRect, null);
6:定时任务的处理
private Timer timer = new Timer(); public void shootByTime() { final Handler handler = new Handler() { @Override public void handleMessage(Message msg) { startScreenShot(); super.handleMessage(msg); } }; timer.schedule(new TimerTask() { @Override public void run() { Message message = new Message(); message.what = 1; handler.sendMessage(message); } }, 0, 100); }
7:横竖屏的处理
@Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); if (newConfig.orientation == this.getResources().getConfiguration().ORIENTATION_PORTRAIT) { mRect = new Rect(51, 775, 745, 47); } else if (newConfig.orientation == this.getResources().getConfiguration().ORIENTATION_LANDSCAPE) { mRect = new Rect(54, 24, 545, 45); } }
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