mp3播放器（六）（播放功能实现）

  1 package com.example.mp3player00;
  2 
  3 import java.io.File;
  4 
  5 import model.Mp3Info;
  6 import android.app.Activity;
  7 import android.content.Intent;
  8 import android.media.MediaPlayer;
  9 import android.net.Uri;
 10 import android.os.Bundle;
 11 import android.os.Environment;
 12 import android.view.View;
 13 import android.view.View.OnClickListener;
 14 import android.widget.ImageButton;
 15 
 16 public class PlayerActivity extends Activity{
 17     ImageButton startButton=null;
 18     ImageButton pauseButton=null;
 19     ImageButton stopButton=null;
 20     MediaPlayer mediaPlayer=null;
 21     private boolean isPlaying=false;
 22     private boolean isPause=false;
 23     private boolean isReleased=false;
 24     Mp3Info mp3Info=null;
 25     @Override
 26     protected void onCreate(Bundle savedInstanceState) {
 27         // TODO Auto-generated method stub
 28         super.onCreate(savedInstanceState);
 29         setContentView(R.layout.player);
 30         Intent intent=getIntent();
 31          mp3Info=(Mp3Info) intent.getSerializableExtra("mp3Info");
 32         startButton=(ImageButton)findViewById(R.id.start);
 33         pauseButton=(ImageButton)findViewById(R.id.pause);
 34         stopButton=(ImageButton)findViewById(R.id.stop);
 35         startButton.setOnClickListener(new startButtonListener());
 36         pauseButton.setOnClickListener(new pauseButtonListener());
 37         stopButton.setOnClickListener(new stopButtonListener());
 38         
 39         
 40     }
 41     class startButtonListener implements OnClickListener{
 42 
 43         @Override
 44         public void onClick(View arg0) {
 45             // TODO Auto-generated method stub
 46             if(!isPlaying){//如果不在播放
 47                 String path=getMp3Path(mp3Info);
 48                 mediaPlayer=MediaPlayer.create(PlayerActivity.this, Uri.parse("file://"+path));
 49                 mediaPlayer.setLooping(false);
 50                 mediaPlayer.start();
 51                 isPlaying=true;
 52                 isReleased=false;
 53             }
 54         }
 55         
 56     }
 57     class pauseButtonListener implements OnClickListener{
 58 
 59         @Override
 60         public void onClick(View v) {
 61             // TODO Auto-generated method stub
 62             if(!isPause){
 63                 //如果当前不在暂停
 64                 mediaPlayer.pause();
 65                 isPause=true;
 66                 isPlaying=false;
 67             }
 68             //如果当前在暂停的状态
 69             else{
 70                 mediaPlayer.start();
 71                 isPause=false;
 72                 isPlaying=true;
 73             }
 74         }
 75         
 76     }
 77     class stopButtonListener implements OnClickListener{
 78 
 79         @Override
 80         public void onClick(View v) {
 81             // TODO Auto-generated method stub
 82             if(isPlaying){
 83                 if(!isReleased){
 84                     mediaPlayer.stop();
 85                     mediaPlayer.release();//释放掉资源，当不再使用mediaPlayer
 86                     isReleased=true;
 87                 }
 88                 isPlaying=false;
 89             }
 90             
 91         }
 92         
 93     }
 94     private String getMp3Path(Mp3Info mp3Info)
 95     {
 96         String SDCardRoot=Environment.getExternalStorageDirectory().getAbsolutePath();
 97         String Path=SDCardRoot+File.separator+"mp3"+File.separator+mp3Info.getMp3Name();
 98         return Path;
 99         
100     }
101     
102     
103     
104 
105 }