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;  
        }  
        }  
        } 

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>

<?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>