网络音乐播放器

1.      加权限

2..      同步代码：方法是顺序执行

          异步代码：开新的线程执行代码

2.       同步的准备方法：需要等待时间

3.       异步的准备方法：不需要等待-------准备完毕监听器

4.        一般用服务的方式播放

代码：

public class MainActivity extends Activity {
	private EditText et_path;
	
	private MediaPlayer mediaPlayer;
	
	private Button bt_play,bt_pause,bt_stop,bt_replay;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		et_path = (EditText) findViewById(R.id.et_path);
		bt_play = (Button) findViewById(R.id.bt_play);
		bt_pause = (Button) findViewById(R.id.bt_pause);
		bt_stop = (Button) findViewById(R.id.bt_stop);
		bt_replay = (Button) findViewById(R.id.bt_replay);
	}
	/**
	 * 播放
	 * @param view
	 */
	public void play(View view) {
		String filepath = et_path.getText().toString().trim();
		//http://
		if(filepath.startsWith("http://")){
			try {
				mediaPlayer = new MediaPlayer();
				mediaPlayer.setDataSource(filepath);//设置播放的数据源。
				mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
				//mediaPlayer.prepare();//同步的准备方法。
				mediaPlayer.prepareAsync();//异步的准备
				mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
					@Override
					public void onPrepared(MediaPlayer mp) {
						mediaPlayer.start();
						bt_play.setEnabled(false);
					}
				});
				mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
					@Override
					public void onCompletion(MediaPlayer mp) {
						bt_play.setEnabled(true);
					}
				});
			} catch (Exception e) {
				e.printStackTrace();
				Toast.makeText(this, "播放失败", 0).show();
			}
		}else{
			Toast.makeText(this, "请检查文件的路径", 0).show();
		}
	}
	/**
	 * 暂停
	 * @param view
	 */
	public void pause(View view) {
		if("继续".equals(bt_pause.getText().toString())){
			mediaPlayer.start();
			bt_pause.setText("暂停");
			return;
		}
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.pause();
			bt_pause.setText("继续");
		}
	}
	/**
	 * 停止
	 * @param view
	 */
	public void stop(View view) {
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.stop();
			mediaPlayer.release();
			mediaPlayer = null;
		}
		bt_pause.setText("暂停");
		bt_play.setEnabled(true);
	}
	/**
	 * 重播
	 * @param view
	 */
	public void replay(View view) {
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.seekTo(0);
		}else{
			play(view);
		}
		bt_pause.setText("暂停");
	}

}