本文介绍了android视频截屏&手机录屏实现代码，分享给大家，希望对大家有帮助

问题

在android中有时候我们需要对屏幕进行截屏操作，单一的截屏操作好解决可以通过activity的顶层view DecorView获取一个bitmap，得到就是当前activity上面的全部视图。

View view = activity.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(); Bitmap bmp = view.getDrawingCache(); DisplayMetrics dm = new DisplayMetrics(); activity.getWindowManager().getDefaultDisplay().getMetrics(dm); Bitmap ret = Bitmap.createBitmap(bmp, 0, 0, dm.widthPixels, dm.heightPixels); view.destroyDrawingCache();

如果activity中包含一些视频播放器比如SurfaceView GLSurfaceView TextureView，在调用截屏代码会发现播放视频的部分是黑屏的，原因是这几种视频渲染的view通过以上代码拿到的是缓冲区不是真正的图像。

解决办法

android5.0以上系统提供了一个 MediaProjectionManager类来对手机进行录屏操作，也支持获取手机的Image图像的操作，知道了这些我们就可以通过提供的api来进行截屏操作了。

这里通过Service来操作截屏和录屏的api

1.绑定截屏的Service

Intent intent = new Intent(this, ScreenService.class); bindService(intent, mServiceConnection, BIND_AUTO_CREATE); public void onServiceConnected(ComponentName className, IBinder service) { DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); ScreenService.RecordBinder binder = (ScreenService.RecordBinder) service; recordService = binder.getRecordService(); recordService.setConfig(metrics.widthPixels, metrics.heightPixels, metrics.densityDpi); mButton.setEnabled(true); mButton.setText(recordService.isRunning() ? "结束" : "开始"); }

2.请求权限 onActivityResult 方法中回调。

Intent captureIntent = projectionManager.createScreenCaptureIntent(); startActivityForResult(captureIntent, RECORD_REQUEST_CODE);

成功后

@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == RECORD_REQUEST_CODE && resultCode == RESULT_OK) { //######## 截屏逻辑 ######## mediaProjection = projectionManager.getMediaProjection(resultCode, data); recordService.setMediaProject(mediaProjection); recordService.initImageReader(); } }

3. 获取截屏

@Override public void onClick(View view) { //######## 截屏逻辑 ######## Bitmap bitmap = recordService.getBitmap(); mImageView.setImageBitmap(bitmap); }

录屏

录屏需要初始化一些录屏参数，输入麦克风类型视频类型，保存路径等

private void initRecorder() { mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mediaRecorder.setOutputFile( getSavePath() + System.currentTimeMillis() + ".mp4"); mediaRecorder.setVideoSize(width, height); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024); mediaRecorder.setVideoFrameRate(30); try { mediaRecorder.prepare(); } catch (IOException e) { e.printStackTrace(); } }

开始录屏

mediaRecorder.start();

保存路径

完整Service代码

public class ScreenService extends Service {private MediaRecorder mediaRecorder;private VirtualDisplay virtualDisplay;private boolean running;private int width = 720;private int height = 1080;private int dpi;private ImageReader mImageReader;private MediaProjection mediaProjection; @Override public IBinder onBind(Intent intent) { return new RecordBinder(); } @Override public void onCreate() { super.onCreate(); running = false; mediaRecorder = new MediaRecorder(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { return super.onStartCommand(intent, flags, startId); } @Override public void onDestroy() { super.onDestroy(); } public void setMediaProject(MediaProjection project) { mediaProjection = project; } public boolean isRunning() { return running; } public void setConfig(int width, int height, int dpi) { this.width = width; this.height = height; this.dpi = dpi; } /** * 开始录屏 * * @return true */ public boolean startRecord() { if (mediaProjection == null || running) { return false; } initRecorder(); createVirtualDisplay(); mediaRecorder.start(); running = true; return true; } /** * 结束录屏 * * @return true */ public boolean stopRecord() { if (!running) { return false; } running = false; mediaRecorder.stop(); mediaRecorder.reset(); virtualDisplay.release(); mediaProjection.stop(); return true; } public void setMediaProjection(MediaProjection mediaProjection) { this.mediaProjection = mediaProjection; } /** * 初始化ImageRead参数 */ public void initImageReader() { if (mImageReader == null) { int maxImages = 2; mImageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, maxImages); createImageVirtualDisplay(); } } /** * 创建一个录屏 Virtual */ private void createVirtualDisplay() { virtualDisplay = mediaProjection .createVirtualDisplay("mediaprojection", width, height, dpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mediaRecorder .getSurface(), null, null); } /** * 创建一个ImageReader Virtual */ private void createImageVirtualDisplay() { virtualDisplay = mediaProjection .createVirtualDisplay("mediaprojection", width, height, dpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mImageReader .getSurface(), null, null); } /** * 初始化保存屏幕录像的参数 */ private void initRecorder() { mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mediaRecorder.setOutputFile( getSavePath() + System.currentTimeMillis() + ".mp4"); mediaRecorder.setVideoSize(width, height); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024); mediaRecorder.setVideoFrameRate(30); try { mediaRecorder.prepare(); } catch (IOException e) { e.printStackTrace(); } } /** * 获取一个保存屏幕录像的路径 * * @return path */ public String getSavePath() { if (Environment.getExternalStorageState() .equals(Environment.MEDIA_MOUNTED)) { String rootDir = Environment.getExternalStorageDirectory() .getAbsolutePath() + "/" + "ScreenRecord" + "/"; File file = new File(rootDir); if (!file.exists()) { if (!file.mkdirs()) { return null; } } return rootDir; } else { return null; } } /** * 请求完权限后马上获取有可能为null，可以通过判断is null来重复获取。 */ public Bitmap getBitmap() { Bitmap bitmap = cutoutFrame(); if (bitmap == null) { getBitmap(); } return bitmap; } /** * 通过底层来获取下一帧的图像 * * @return bitmap */ public Bitmap cutoutFrame() { Image image = mImageReader.acquireLatestImage(); if (image == null) { return null; } 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); return Bitmap.createBitmap(bitmap, 0, 0, width, height); } public class RecordBinder extends Binder { public ScreenService getRecordService() { return ScreenService.this; } }

demo下载

github

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