录制视频等
https://blog.csdn.net/yoonerloop/article/details/107736419
LessonTwoActivity 已经试过
https://hub.fastgit.org/learnopengles/Learn-OpenGLES-Tutorials
mediacodec
https://hub.fastgit.org/cedricfung/MediaCodecDemo/blob/master/src/io/vec/demo/mediacodec/DecodeActivity.java
Environment.getExternalStorageDirectory() + "/1.mp4"; 就是sd卡目录