基本创作和演奏

MediaPlayer 类可用于控制音频/视频文件和流的播放。

MediaPlayer 对象的创建可以有三种类型：

1. 来自本地资源的媒体

    placeholderCopyMediaPlayer mediaPlayer = MediaPlayer.create(context, R.raw.resource);
   mediaPlayer.start(); // no need to call prepare(); create() does that for you

2. 从本地 URI（从 ContentResolver 获取）

    placeholderCopyUri myUri = ....; // initialize Uri here
   MediaPlayer mediaPlayer = new MediaPlayer();
   mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
   mediaPlayer.setDataSource(getApplicationContext(), myUri);
   mediaPlayer.prepare();
   mediaPlayer.start();

3. 来自外部 URL

    placeholderCopyString url = "http://........"; // your URL here
   MediaPlayer mediaPlayer = new MediaPlayer();
   mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
   mediaPlayer.setDataSource(url);
   mediaPlayer.prepare(); // might take long! (for buffering, etc)
   mediaPlayer.start();