Android5.0免Root截屏,錄屏
http://blog.csdn.net/wds1181977/article/details/52174840
MediaProjection介紹
MediaProjection可以用來捕捉屏幕，具體來說可以截取當前屏幕和錄制屏幕視頻。MediaProjection由MediaProjectionManager來管理和獲取。
使用步驟
首先獲取MediaProjectionManager，和其他的Manager一樣通過 Context.getSystemService() 傳入參數MEDIA_PROJECTION_SERVICE獲得實例。
接著調用MediaProjectionManager.createScreenCaptureIntent()彈出dialog詢問用戶是否授權應用捕捉屏幕，同時覆寫onActivityResult()獲取授權結果。
如果授權成功，通過MediaProjectionManager.getMediaProjection(int resultCode, Intent resultData)獲取MediaProjection實例，通過MediaProjection.createVirtualDisplay(String name, int width, int height, int dpi, int flags, Surface surface, VirtualDisplay.Callback callback, Handler handler)創建VirtualDisplay實例。實際上在上述方法中傳入的surface參數，是真正用來截屏或者錄屏的。
截屏
截屏這裏用到ImageReader類，這個類的getSurface()方法獲取到surface直接傳入MediaProjection.createVirtualDisplay()方法中，此時就可以執行截取。通過ImageReader.acquireLatestImage()方法即可獲取當前屏幕的Image，經過簡單處理之後即可保存為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, "bitmap create 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(), "截圖成功", Toast.LENGTH_SHORT).show(); } catch (IOException e) { Log.e(TAG, e.toString()); e.printStackTrace(); } } }
錄屏
錄屏需要用到上篇博文中的MediaCadec，這個類將原始的屏幕數據編碼，在通過MediaMuxer分裝為mp4格式保存。MediaCodec.createInputSurface()獲取一個surface對象講起傳入MediaProjection.createVirtualDisplay()即可獲取屏幕原始多媒體數據，之後讀取MediaCodec編碼輸出數據經過MediaMuxer封裝處理為mp4即可播放，實現錄屏。
private void recordVirtualDisplay() {//循環多去編解碼器輸出數據經過處理保存為mp4
while (!mIsQuit.get()) {
int index = mMediaCodec.dequeueOutputBuffer(mBufferInfo, 10000);
Log.i(TAG, "dequeue output buffer index=" + index);
if (index == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {//後續輸出格式變化
resetOutputFormat();
} else if (index == MediaCodec.INFO_TRY_AGAIN_LATER) {//請求超時
Log.d(TAG, "retrieving buffers time out!");
try {
// wait 10ms
Thread.sleep(10);
} catch (InterruptedException e) {
}
} else if (index >= 0) {//有效輸出
if (!mMuxerStarted) {
throw new IllegalStateException("MediaMuxer dose not call addTrack(format) ");
}
encodeToVideoTrack(index);
mMediaCodec.releaseOutputBuffer(index, false);
}
}
}
private void encodeToVideoTrack(int index) {//輸出數據為mp4文件
ByteBuffer encodedData = mMediaCodec.getOutputBuffer(index);
if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) {//是特定格式信息等配置數據，不是媒體數據
// 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 = null;
} else {
Log.d(TAG, "got buffer, info: size=" + mBufferInfo.size
+ ", presentationTimeUs=" + mBufferInfo.presentationTimeUs
+ ", offset=" + mBufferInfo.offset);
}
if (encodedData != null) {//存在編碼數據
encodedData.position(mBufferInfo.offset);
encodedData.limit(mBufferInfo.offset + mBufferInfo.size);
mMuxer.writeSampleData(mVideoTrackIndex, encodedData, mBufferInfo);//寫入
Log.i(TAG, "sent " + mBufferInfo.size + " bytes to muxer...");
}
}
private void resetOutputFormat() {
// should happen before receiving buffers, and should only happen once
if (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);
}
附錄參考
官方文檔
Android視頻錄制
Android 5.0截屏
Android錄屏代碼
本文Demo
Android5.0免Root截屏,錄屏