Android實現(xiàn)截屏功能
導言
目前截屏的方法很多,root不適用,要么其他方法就是有局限性,而其中官方給出的方案最好—MediaProjection
介紹
Android 5.0以后開放的錄屏API,取視頻中的一幀數(shù)據(jù),這樣就可以實現(xiàn)截屏
步驟
在activity中授權(quán),在service中完成初始化并截圖,當然可以后臺定時截圖,但是6.0系統(tǒng)會有內(nèi)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中授權(quán)
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中完成截圖重要步驟:
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); } //異常處理的核心 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<Image, Void, Bitmap> { @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); //這就是初始截圖 bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height); image.close(); return bitmap; } @Override protected void onPostExecute(final Bitmap bitmap) { super.onPostExecute(bitmap); //處理bitmap的業(yè)務(wù)代碼 }
5:Bitmap轉(zhuǎn)IS流,指定區(qū)域截圖
// 將Bitmap轉(zhuǎn)換成InputStream ByteArrayOutputStream bos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos); InputStream inputStream = new ByteArrayInputStream(bos.toByteArray()); //指定區(qū)域截圖 Rect mRect = new Rect(51, 74, 58, 62); BitmapRegionDecoder bitmapRegionDecoder = BitmapRegionDecoder.newInstance(inputStream, true); Bitmap bm = bitmapRegionDecoder.decodeRegion(mRect, null);
6:定時任務(wù)的處理
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:橫豎屏的處理
@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:還有很多,只需按照需求走就OK,沒有難的東西,需要不停的學習和積累
以上就是本文的全部內(nèi)容,希望對大家的學習有所幫助,也希望大家多多支持腳本之家。
相關(guān)文章
Android開發(fā)中ViewPager實現(xiàn)多頁面切換效果
ViewPager用于實現(xiàn)多頁面的切換效果,該類存在于Google的兼容包里面,所以在引用時記得在BuilldPath中加入“Android-support-v4.jar”。具體詳情大家可以參考下本文2016-11-11Android開發(fā)之ImageSwitcher相冊功能實例分析
這篇文章主要介紹了Android開發(fā)之ImageSwitcher相冊功能,結(jié)合實例形式分析了Android ImageSwitcher相冊的原理、使用方法及相關(guān)操作注意事項,需要的朋友可以參考下2019-03-03Android不使用自定義布局情況下實現(xiàn)自定義通知欄圖標的方法
這篇文章主要介紹了Android不使用自定義布局情況下實現(xiàn)自定義通知欄圖標的方法,實例分析了Android通知欄圖標的創(chuàng)建技巧,具有一定參考借鑒價值,需要的朋友可以參考下2015-12-12android仿360加速球?qū)崿F(xiàn)內(nèi)存釋放
本篇文章實現(xiàn)了Android仿360加速球?qū)崿F(xiàn)內(nèi)存釋放,小編覺得挺不錯的,現(xiàn)在分享給大家,也給大家做個參考。一起跟隨小編過來看看吧2016-10-10音量控制鍵控制的音頻流(setVolumeControlStream)描述
當開發(fā)多媒體應(yīng)用或者游戲應(yīng)用的時候,需要使用音量控制鍵來設(shè)置程序的音量大小,在Android系統(tǒng)中有多種音頻流,感興趣的朋友可以了解下2013-01-01