android VideoView播放视频,MediaRecorder 录音

1. 在Android系统中，是通过MediaPalyer类播放媒体文件的（包括视频和音频）。虽然这个类已经比较简单了，但是还需要控制各种状态，对于视频还需要设置输出窗口，还是需要仔细研究的。为了避免这些麻烦事儿，Android框架提供了VideoView类来封装MediaPalyer

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //全屏
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    //标题去掉
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    //要在全屏等设置完毕后再加载布局
    setContentView(R.layout.main);

    //定义UI组件
    VideoView videoView = (VideoView) findViewById(R.id.VideoView01);
    //定义MediaController对象
    MediaController mediaController = new MediaController(this);
    //设置VideoView的控制器是mediaController
    videoView.setMediaController(mediaController);

    //这两种方法都可以 videoView.setVideoPath("file:///sdcard/love_480320.mp4");
    videoView.setVideoURI(Uri.parse("/sdcard/love_480320.mp4"));
    //启动后就播放
    videoView.start();
}

 2. MediaRecorder

A common case of using MediaRecorder to record audio works as follows:

MediaRecorder recorder = new MediaRecorder();
 recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
 recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
 recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
 recorder.setOutputFile(PATH_NAME);
 recorder.prepare();
 recorder.start();   // Recording is now started
 ...
 recorder.stop();
 recorder.reset();   // You can reuse the object by going back to setAudioSource() step
 recorder.release(); // Now the object cannot be reused