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