Android多媒体-MediaPlayer使用模式

先不多说，直接上代码

public class SimpleMediaPlayerActivity extends Activity {		//private static final Uri mMusicUri = Uri.fromFile(new File("/sdcard/sound_file_1.mp3"));	private static final Uri mMusicUri = Uri.parse("http://czanxi.azone.artron.net/users_info/88/czanxi/2009121322260351292.mp3");	private MediaPlayer mMediaPlayer = null;		@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		playMusic1();	}		/**	 * 第一种方式,通过create创建	 */	private void playMusic1() {		stopCurrentMediaPlayer();		mMediaPlayer = MediaPlayer.create(this, mMusicUri);  //prepared		mMediaPlayer.start(); // no need to call prepare(); create() does that for you	}	/**	 * 第二种方式，通过new MediaPlayer()创建，通过prepare	 */	private void playMusic2() {		stopCurrentMediaPlayer();		mMediaPlayer = new MediaPlayer();  //idle		mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);		try {			mMediaPlayer.setDataSource(getApplicationContext(), mMusicUri);			mMediaPlayer.prepare();					} catch (IllegalArgumentException e) {			e.printStackTrace();		} catch (SecurityException e) {			e.printStackTrace();		} catch (IllegalStateException e) {			e.printStackTrace();		} catch (IOException e) {			e.printStackTrace();		}		mMediaPlayer.start();	}		/**	 * 第三种方式，通过new MediaPlayer()创建，通过prepareAsync	 */	private void playMusic3() {		mMediaPlayer = new MediaPlayer()  ;		mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC)  ;		mMediaPlayer.setOnPreparedListener(new OnPreparedListener()		{			@Override			public void onPrepared(MediaPlayer mediaPlayer) {				mediaPlayer.start()  ;			}					}) ;		try {			mMediaPlayer.setDataSource(getApplicationContext(), mMusicUri);			mMediaPlayer.prepareAsync()  ;//异步加载		} catch (IllegalArgumentException e) {			e.printStackTrace();		} catch (SecurityException e) {			e.printStackTrace();		} catch (IllegalStateException e) {			e.printStackTrace();		} catch (IOException e) {			e.printStackTrace();		}	}			@Override	protected void onDestroy() {		stopCurrentMediaPlayer();		super.onDestroy();	}		private void stopCurrentMediaPlayer() {		if (mMediaPlayer != null) {			mMediaPlayer.stop();			mMediaPlayer.release();			mMediaPlayer = null;		}	}	}

new 之后是idle状态 ，create之后是 prepared状态。这也是为何我们在调用create之后不需要再手动调用prepare()方法去更改状态。

第一种、第二种和第三种的区别是：

前两种为同步方式，因为涉及到识别及解码等IO耗时操作，容易引起主线程堵塞。第三种为异步方式，不会引发此问题，推荐此方式。