Android中从SD卡中读取歌曲

先看看我的效果图吧

Activity类

         private TextView nameTextView;
     private SeekBar seekBar;
     private ListView listView;
     private List<Map<String, String>> data;
     private int current;
     private MediaPlayer player;
     private Handler handler = new Handler();
     private Button ppButton;
     private boolean isPause;
     private boolean isStartTrackingTouch;
         protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.mainb);
                 ib3=(ImageButton) findViewById(R.id.ib3);
         ib3.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent it=new Intent(Music_b.this,Music_gc.class);
                 String name=data.get(current).get("name");
                 it.putExtra("name", name);
                 startActivityForResult(it, 1);
             }
         });
         tv=(TextView)findViewById(R.id.tvbb);
         sp=(Spinner) findViewById(R.id.sp);
         sp.setOnItemSelectedListener(new OnItemSelectedListener() {
             @Override
             public void onItemSelected(AdapterView<?> arg0, View view,
                     int arg2, long arg3) {
                 TextView tv1=(TextView)view;
                 String str=tv1.getText().toString();
                 tv.setText(str);
             }
             @Override
             public void onNothingSelected(AdapterView<?> arg0) {
             }
         });
         sp1=(Spinner) findViewById(R.id.sp1);
         sp1.setOnItemSelectedListener(new OnItemSelectedListener() {

             @Override
             public void onItemSelected(AdapterView<?> arg0, View view,
                     int arg2, long arg3) {
                 TextView tv1=(TextView)view;
                 String str=tv1.getText().toString();
                 tv.setText(str);
             }
             @Override
             public void onNothingSelected(AdapterView<?> arg0) {

             }
         });
             nameTextView = (TextView) findViewById(R.id.name);
         seekBar = (SeekBar) findViewById(R.id.seekBar);
         listView = (ListView) findViewById(R.id.list);
         ppButton = (Button) findViewById(R.id.pp);
         //创建一个音乐播放器
         player = new MediaPlayer();
         //显示音乐播放器
         generateListView();
         //进度条监听器
         seekBar.setOnSeekBarChangeListener(new MySeekBarListener());
         //播放器监听器
         player.setOnCompletionListener(new MyPlayerListener());
         //意图过滤器
         IntentFilter filter = new IntentFilter();
     }
     private final class MyPlayerListener implements OnCompletionListener {
         //歌曲播放完后自动播放下一首歌区
         public void onCompletion(MediaPlayer mp) {
             next();
         }
     }
     public void next(View view) {
         next();
     }
     public void previous(View view) {
         previous();
     }
     private void previous() {
         current = current - 1 < 0 ? data.size() - 1 : current - 1;
         play();
     }
     private void next() {
         current = (current + 1) % data.size();
         play();
     }
     private final class MySeekBarListener implements OnSeekBarChangeListener {
         //移动触发
         public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
         }
         //起始触发
         public void onStartTrackingTouch(SeekBar seekBar) {
             isStartTrackingTouch = true;
         }
         //结束触发
         public void onStopTrackingTouch(SeekBar seekBar) {
             player.seekTo(seekBar.getProgress());
             isStartTrackingTouch = false;
         }
     }
     private void generateListView() {
         List<File> list = new ArrayList<File>();
         //获取sdcard中的所有歌曲
         findAll(Environment.getExternalStorageDirectory(), list);
         //播放列表进行排序，字符顺序
         Collections.sort(list);
         data = new ArrayList<Map<String, String>>();
         for (File file : list) {
             Map<String, String> map = new HashMap<String, String>();
             map.put("name", file.getName());
             map.put("path", file.getAbsolutePath());
             data.add(map);
         }
         SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.mainmp3_item, new String[] { "name" }, new int[] { R.id.mName });
         listView.setAdapter(adapter);
         listView.setOnItemClickListener(new MyItemListener());
     }
     private final class MyItemListener implements OnItemClickListener {
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
             current = position;
             play();
         }
     }
     private void play() {
         try {
             //重播
             player.reset();
             //获取歌曲路径
             player.setDataSource(data.get(current).get("path"));
             //缓冲
             player.prepare();
             //开始播放
             player.start();
             //显示歌名
             nameTextView.setText(data.get(current).get("name"));
             //设置进度条长度
             seekBar.setMax(player.getDuration());
             //播放按钮样式
             ppButton.setText("||");
             //发送一个Runnable，handler收到之后就会执行run()方法
             handler.post(new Runnable() {
                 public void run() {
                     // 更新进度条状态
                     if (!isStartTrackingTouch)
                         seekBar.setProgress(player.getCurrentPosition());
                     // 1秒之后再次发送
                     handler.postDelayed(this, 1000);
                 }
             });
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
     private void findAll(File file, List<File> list) {
         File[] subFiles = file.listFiles();
         if (subFiles != null)
             for (File subFile : subFiles) {
                 if (subFile.isFile() && subFile.getName().endsWith(".mp3"))
                     list.add(subFile);
                 else if (subFile.isDirectory())//如果是目录
                     findAll(subFile, list); //递归
             }
     }
     public void pp(View view) {
         //默认从第一首歌开始播放
         if (!player.isPlaying() && !isPause) {
             play();
             return;
         }
         Button button = (Button) view;
         //暂停/播放按钮
         if ("||".equals(button.getText())) {
             pause();
             button.setText("|>");
         }else if("|>".equals(button.getText())) {
             resume();
             button.setText("||");
         }
     }
     private void resume() {
         if (isPause) {
             player.start();
             isPause = false;
         }
     }
     private void pause() {
         if (player != null && player.isPlaying()) {
             player.pause();
             isPause = true;
         }
         }
         } 

示例代码

xml类

 <TableLayout
         android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
         <TableRow>
             <ListView
                 android:id="@+id/list"
                   android:layout_width="wrap_content"
                   android:layout_height="fill_parent"
             />
         </TableRow>
     </TableLayout>
     <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="50px"
      />
     <RelativeLayout
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         >
         <ImageButton
             android:id="@+id/ib3"
             android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:src="@drawable/b"
              android:background="#00000000"
             android:layout_alignParentBottom="true"
         />
         <SeekBar
             android:id="@+id/seekBar"
             style="?android:attr/progressBarStyleHorizontal"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:paddingLeft="88dip"
             android:progressDrawable="@drawable/seekbar"
             android:thumb="@drawable/thumb"
             android:layout_alignTop="@id/ib3"
             android:max="100"
             android:maxHeight="2.0dip"
             android:minHeight="2.0dip"
           />
         <Button
             android:id="@+id/bt021"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="|▶"
             android:onClick="previous"
             android:layout_toRightOf="@id/ib3"
             android:background="#00000000"
             android:layout_marginRight="30px"
             android:paddingLeft="20dip"
             android:layout_alignParentBottom="true"
         />
         <Button
             android:id="@+id/pp"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="▶"
             android:onClick="pp"
             android:layout_toRightOf="@id/bt021"
             android:background="#00000000"
             android:layout_marginRight="30px"
             android:layout_alignParentBottom="true"
         />
         <Button
               android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="▶|"
             android:onClick="next"
             android:layout_toRightOf="@id/pp"
             android:background="#00000000"
             android:layout_marginTop="20dip"
             android:layout_alignParentBottom="true"
         />
      </RelativeLayout>

示例代码

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="horizontal"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:background="#FFFFFF"
     >
     <TableLayout
         android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
         <TableRow>
             <TextView
                 android:id="@+id/textview"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 />
         </TableRow>
     </TableLayout>

 </LinearLayout>

第二个xml