android:music

　　　

 package com.terry;

 import java.io.File;
 import java.io.FileFilter;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;

 import android.app.ListActivity;
 import android.media.MediaPlayer;
 import android.media.MediaPlayer.OnCompletionListener;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.ListView;
 import android.widget.Toast;

 public class myActivity2 extends ListActivity implements OnClickListener {
     Button play;
     Button pause;
     Button next;
     Button last;
     // ListView listViews;
     List<String> list;
     MediaPlayer mediaplayer;
     String PATH_ROOT = "/sdcard/";
     //当前项目名称
     String CURRENT_ITME = "";
     //当前位置
     int CURRENT_POSITON = 0;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);
         // Intent intent = new Intent();
         setContentView(R.layout.main2);

         initViews();
         initListViews();
         mediaplayer = new MediaPlayer();
     }

     private void initViews() {
         // TODO Auto-generated method stub
         play = (Button) findViewById(R.id.start2);
         pause = (Button) findViewById(R.id.pause2);
         next = (Button) findViewById(R.id.next2);
         last = (Button) findViewById(R.id.last2);
         play.setOnClickListener(this);
         pause.setOnClickListener(this);
         next.setOnClickListener(this);
         last.setOnClickListener(this);
     }

     private void initListViews() {
         // 初始化ListViews
         // listViews
         list = new ArrayList<String>();
         ArrayAdapter<String> musiclistadapter;
         File file = new File(PATH_ROOT);
         if (file != null) {
             if (file.isDirectory()) {
                 File[] listfiles = file.listFiles();
                 if (listfiles != null) {
                     for (int i = 0; i < listfiles.length; i++) {
                         String name = listfiles[i].getName();
                         if (name.endsWith(".mp3")) {
                             list.add(name);
                         }
                     }
                 }
             }
         }
         musiclistadapter = new ArrayAdapter<String>(this, R.layout.musicitme,
                 list);
         setListAdapter(musiclistadapter);
     }

     @Override
     public void onClick(View v) {
         switch (v.getId()) {
         case R.id.start2:
             // mediaplayer.p
             playMusic(PATH_ROOT + CURRENT_ITME);

             break;

         case R.id.pause2:
             if (mediaplayer.isPlaying()) {
                 mediaplayer.pause();
             } else {
                 Toast.makeText(this, "没有正在播放的音乐,我自动播放咯。。。。", 100).show();
                 playMusic(PATH_ROOT + CURRENT_ITME);
             }
             break;
         case R.id.next2:
             System.out.println("xiayishou....");
             CURRENT_POSITON += 1;
             CURRENT_ITME = list.get(CURRENT_POSITON);
             playMusic(PATH_ROOT + CURRENT_ITME);
             System.out.println("path:" + PATH_ROOT + CURRENT_ITME);
             Toast.makeText(this, "下一首音乐,path:" + PATH_ROOT + CURRENT_ITME, 100)
                     .show();
             break;
         case R.id.last2:
             System.out.println("shangyishou....");
             CURRENT_POSITON -= 1;
             CURRENT_ITME = list.get(CURRENT_POSITON);
             playMusic(PATH_ROOT + CURRENT_ITME);
             System.out.println("path:" + PATH_ROOT + CURRENT_ITME);
             Toast.makeText(this, "shang一首音乐,path:" + PATH_ROOT + CURRENT_ITME, 100)
                     .show();
             break;
         }
     }

     private void playMusic(String path) {
         mediaplayer.reset();
         try {
             mediaplayer.setDataSource(path);
             mediaplayer.prepare();
             mediaplayer.start();
             mediaplayer
                     .setOnCompletionListener(new myOnCompleteMusicListener());
         } catch (IllegalArgumentException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (SecurityException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IllegalStateException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

     }

     public class myOnCompleteMusicListener implements OnCompletionListener {

         @Override
         public void onCompletion(MediaPlayer mp) {
             // TODO
             // playMusic(P);
         }

     }

     @Override
     protected void onListItemClick(ListView l, View v, int position, long id) {
         // TODO Auto-generated method stub
         super.onListItemClick(l, v, position, id);
         CURRENT_POSITON = position;
         CURRENT_ITME = list.get(position);//获取当前位置的String字符串，即文件名
         playMusic(PATH_ROOT + CURRENT_ITME);
         Toast.makeText(this, "PATH:" + PATH_ROOT + CURRENT_ITME, 100).show();
         System.out.println("path:" + PATH_ROOT + CURRENT_ITME);
     }

 }