mp3播放器

public class MainActivity extends Activity implements OnClickListener{private EditText et_path;private Button bt_play, bt_replay, bt_pause, bt_stop;private MediaPlayer mp;@Overrideprotected 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_replay = (Button)findViewById(R.id.bt_replay);bt_stop = (Button)findViewById(R.id.bt_stop);bt_play.setOnClickListener(this);bt_pause.setOnClickListener(this);bt_replay.setOnClickListener(this);bt_stop.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch(v.getId()){case R.id.bt_play:play();break;case R.id.bt_pause:pause();break;case R.id.bt_replay:replay();break;case R.id.bt_stop:stop();break;}}public void play(){String path = et_path.getText().toString().trim();File file = new File(path);if(file.exists()&&file.length()>0){try {//Uri myUri = Uri.parse("/data/data/com.example.player/a.mp3"); // initialize Uri hereif(mp == null){mp = new MediaPlayer();mp.setAudioStreamType(AudioManager.STREAM_MUSIC);mp.setDataSource(path);mp.prepare();mp.start();}} catch (Exception e) {Toast.makeText(this, "播放失败", 1).show();e.printStackTrace();} }else{Toast.makeText(this, "音频文件不存在", 1).show();}/*if(mp == null){mp = new MediaPlayer();mp.create(getApplicationContext(), R.raw.a);mp.start();}*/}public void pause(){//mp.pause();if((bt_pause.getText().toString().trim()).equals("暂停")){if(mp!=null&&mp.isPlaying()){bt_pause.setText("继续");mp.pause();}}else{bt_pause.setText("暂停");mp.start();}}/** * 重新播放 */public void replay(){if(mp!=null&&mp.isPlaying()){mp.seekTo(0);return;}play();}/** * 停止播放 */public void stop(){if(mp!=null&&mp.isPlaying()){mp.stop();mp.release();mp = null;}}}