package com.zhangbz.musicplayer;import java.io.File;import android.app.Activity;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;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_replay = (Button) findViewById(R.id.bt_replay);        bt_stop = (Button) findViewById(R.id.bt_stop);    }    /**     * 播放     * @param view     */    public void play(View view) {        String filepath = et_path.getText().toString().trim();        File file = new File(filepath);        if(file.exists()) {            try {                mediaPlayer = new MediaPlayer();                mediaPlayer.setDataSource(filepath);//设置播放的数据源                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);                mediaPlayer.prepare();//准备开始播放,播放的逻辑是c代码在新的线程执行。                mediaPlayer.start();                bt_play.setEnabled(false);                mediaPlayer.setOnCompletionListener(new OnCompletionListener() {                                        public void onCompletion(MediaPlayer arg0) {                        bt_play.setEnabled(true);                    }                });            } catch (Exception e) {                Toast.makeText(this, "播放失败", 0).show();                e.printStackTrace();            }        } else {            Toast.makeText(this, "文件不存在，请检查文件路径", 0).show();        }    }    /**     * 暂停     * @param view     */    public void pause(View view) {        if("继续".equals(bt_pause.getText().toString().trim())) {            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_replay.setText("暂停");    }}