Android实现截屏功能

目前截屏的方法很多,root不适用,要么其他方法就是有局限性,而其中官方给出的方案最好—MediaProjection

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

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 trueminSdkVersion 21targetSdkVersion 21versionCode 1versionName '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() {@Overridepublic void run() { stopVirtual(); tearDownMediaProjection();} }, 0);} }public class SaveTask extends AsyncTask<Image, Void, Bitmap> {@Overrideprotected 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;}@Overrideprotected 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);} }

8:还有很多，只需按照需求走就OK，没有难的东西，需要不停的学习和积累

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