安卓屏幕录制,MediaProjection获取屏幕信息，Mediacodec对视频流解码，最后Muxer解码并保存为视频文件-Andrews screen recording and save it as a video file

android 5.0以上无需root，使用MediaCodec和VirtualDisplay录制屏幕，并用Muxer封装成MP4文件-Android 5.0 above without root, use MediaCodec and VirtualDisplay recording screen, and use Muxer package into MP4 files