Android5.0免Root截屏,录屏 _Android

古人已用三冬足，年少今开万卷余。这篇文章主要讲述Android5.0免Root截屏,录屏相关的知识，希望能为你提供帮助。
http://blog.csdn.net/wds1181977/article/details/52174840

文章图片
MediaProjection介绍【Android5.0免Root截屏,录屏】MediaProjection可以用来捕捉屏幕，具体来说可以截取当前屏幕和录制屏幕视频。MediaProjection由MediaProjectionManager来管理和获取。
使用步骤
首先获取MediaProjectionManager，和其他的Manager一样通过 Context.getSystemService() 传入参数MEDIA_PROJECTION_SERVICE获得实例。
接着调用MediaProjectionManager.createScreenCaptureIntent()弹出dialog询问用户是否授权应用捕捉屏幕，同时覆写onActivityResult()获取授权结果。
如果授权成功，通过MediaProjectionManager.getMediaProjection(int resultCode, Intent resultData)获取MediaProjection实例，通过MediaProjection.createVirtualDisplay(String name, int width, int height, int dpi, int flags, Surface surface, VirtualDisplay.Callback callback, Handler handler)创建VirtualDisplay实例。实际上在上述方法中传入的surface参数，是真正用来截屏或者录屏的。
截屏截屏这里用到ImageReader类，这个类的getSurface()方法获取到surface直接传入MediaProjection.createVirtualDisplay()方法中，此时就可以执行截取。通过ImageReader.acquireLatestImage()方法即可获取当前屏幕的Image，经过简单处理之后即可保存为Bitmap。

private void startCapture() {mImageName = System.currentTimeMillis() + ".png"; Log.e(TAG, "image name is : " + mImageName); 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(); if (bitmap != null) {Log.e(TAG, "bitmapcreate success "); try {File fileFolder = new File(mImagePath); if (!fileFolder.exists())fileFolder.mkdirs(); File file = new File(mImagePath, mImageName); if (!file.exists()) {Log.e(TAG, "file create success "); file.createNewFile(); }FileOutputStream out = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); out.flush(); out.close(); Log.e(TAG, "file save success "); Toast.makeText(this.getApplicationContext(), "截图成功", Toast.LENGTH_SHORT).show(); } catch (IOException e) {Log.e(TAG, e.toString()); e.printStackTrace(); }}}

录屏录屏需要用到上篇博文中的MediaCadec，这个类将原始的屏幕数据编码，在通过MediaMuxer分装为mp4格式保存。MediaCodec.createInputSurface()获取一个surface对象讲起传入MediaProjection.createVirtualDisplay()即可获取屏幕原始多媒体数据，之后读取MediaCodec编码输出数据经过MediaMuxer封装处理为mp4即可播放，实现录屏。

private void recordVirtualDisplay() {//循环多去编解码器输出数据经过处理保存为mp4while (!mIsQuit.get()) {int index = mMediaCodec.dequeueOutputBuffer(mBufferInfo, 10000); Log.i(TAG, "dequeue output buffer index=" + index); if (index == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {//后续输出格式变化resetOutputFormat(); } else if (index == MediaCodec.INFO_TRY_AGAIN_LATER) {//请求超时Log.d(TAG, "retrieving buffers time out!"); try {// wait 10msThread.sleep(10); } catch (InterruptedException e) {}} else if (index > = 0) {//有效输出if (!mMuxerStarted) {throw new IllegalStateException("MediaMuxer dose not call addTrack(format) "); }encodeToVideoTrack(index); mMediaCodec.releaseOutputBuffer(index, false); }}}private void encodeToVideoTrack(int index) {//输出数据为mp4文件ByteBuffer encodedData = https://www.songbingjia.com/android/mMediaCodec.getOutputBuffer(index); if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) {//是特定格式信息等配置数据，不是媒体数据// The codec config data was pulled out and fed to the muxer when we got// the INFO_OUTPUT_FORMAT_CHANGED status.// Ignore it.Log.d(TAG,"ignoring BUFFER_FLAG_CODEC_CONFIG"); mBufferInfo.size = 0; }if (mBufferInfo.size == 0) {Log.d(TAG, "info.size == 0, drop it."); encodedData = https://www.songbingjia.com/android/null; } else {Log.d(TAG,"got buffer, info: size=" + mBufferInfo.size+ ", presentationTimeUs=" + mBufferInfo.presentationTimeUs+ ", offset=" + mBufferInfo.offset); }if (encodedData != null) {//存在编码数据encodedData.position(mBufferInfo.offset); encodedData.limit(mBufferInfo.offset + mBufferInfo.size); mMuxer.writeSampleData(mVideoTrackIndex, encodedData, mBufferInfo); //写入Log.i(TAG, "sent " + mBufferInfo.size + " bytes to muxer..."); }}private void resetOutputFormat() {// should happen before receiving buffers, and should only happen onceif (mMuxerStarted) {throw new IllegalStateException("output format already changed!"); }MediaFormat newFormat = mMediaCodec.getOutputFormat(); Log.i(TAG, "output format changed.\n new format: " + newFormat.toString()); mVideoTrackIndex = mMuxer.addTrack(newFormat); mMuxer.start(); mMuxerStarted = true; Log.i(TAG, "started media muxer, videoIndex=" + mVideoTrackIndex); }

附录参考官方文档
Android视频录制
Android 5.0截屏
Android录屏代码
本文Demo