package com.example.playaudiotest;import java.io.File;import android.app.Activity;import android.media.MediaPlayer;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity implements OnClickListener {    private Button play;    private Button pause;    private Button stop;    private MediaPlayer mediaPlayer = new MediaPlayer();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        play = (Button) findViewById(R.id.play);        pause = (Button) findViewById(R.id.pause);        stop = (Button) findViewById(R.id.stop);        play.setOnClickListener(this);        pause.setOnClickListener(this);        stop.setOnClickListener(this);        initMediaPlayer();    }    private void initMediaPlayer() {        try {            File file = new File(Environment.getExternalStorageDirectory(), "music.mp3");            mediaPlayer.setDataSource(file.getPath());            mediaPlayer.prepare();        } catch (Exception e) {            e.printStackTrace();        }    }    @Override    public void onClick(View v) {        switch (v.getId()) {        case R.id.play:            if (!mediaPlayer.isPlaying()) {                mediaPlayer.start();            }            break;        case R.id.pause:            if (mediaPlayer.isPlaying()) {                mediaPlayer.pause();            }            break;        case R.id.stop:            if (mediaPlayer.isPlaying()) {                mediaPlayer.reset();                initMediaPlayer();            }            break;        default:            break;        }    }    @Override    protected void onDestroy() {        super.onDestroy();        if (mediaPlayer != null) {            mediaPlayer.stop();            mediaPlayer.release();        }    }}