简单的音乐播放器

main.xml  :

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
    <TextView    
        android:id="@+id/name" 
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        /> 
    <SeekBar 
        android:id="@+id/seekBar" 
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:layout_marginBottom="5dp" 
        /> 
    <LinearLayout 
        android:layout_width="fill_parent"   
        android:layout_height="wrap_content"   
        android:layout_marginBottom="20dp" 
        > 
        <Button 
            android:layout_width="40dp"   
            android:layout_height="40dp"   
            android:text="|◀" 
            android:onClick="previous" 
            /> 
        <Button 
            android:id="@+id/pp" 
            android:layout_width="40dp"   
            android:layout_height="40dp"   
            android:text="▶" 
            android:onClick="pp" 
            /> 
        <Button 
            android:layout_width="40dp"   
            android:layout_height="40dp"   
            android:text="▶|" 
            android:onClick="next" 
            /> 
    </LinearLayout> 
    <ListView 
        android:id="@+id/list" 
        android:layout_width="fill_parent"   
        android:layout_height="fill_parent"   
        /> 
</LinearLayout> 


item.xml：
       
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:padding="10dp" 
    > 
    <TextView 
        android:id="@+id/mName" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:textSize="15sp" 
        /> 
</LinearLayout> 

JAVA代码：
package cn.test.audio;  
 
import java.io.File;  
import java.util.ArrayList;  
import java.util.Collections;  
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
 
import android.app.Activity;  
import android.content.BroadcastReceiver;  
import android.content.Context;  
import android.content.Intent;  
import android.content.IntentFilter;  
import android.media.MediaPlayer;  
import android.media.MediaPlayer.OnCompletionListener;  
import android.os.Bundle;  
import android.os.Environment;  
import android.os.Handler;  
import android.telephony.PhoneStateListener;  
import android.telephony.TelephonyManager;  
import android.view.View;  
import android.widget.AdapterView;  
import android.widget.Button;  
import android.widget.ListView;  
import android.widget.SeekBar;  
import android.widget.SimpleAdapter;  
import android.widget.TextView;  
import android.widget.AdapterView.OnItemClickListener;  
import android.widget.SeekBar.OnSeekBarChangeListener;  
 
public class MainActivity extends Activity {  
    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;  
 
    public void onCreate(Bundle savedInstanceState) {   
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
 
        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();  
 
        //显示音乐播放列表  
        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();  
          
        //播出电话暂停音乐播放  
        filter.addAction("android.intent.action.NEW_OUTGOING_CALL");  
        registerReceiver(new PhoneListener(), filter);  
 
        //创建一个电话服务  
        TelephonyManager manager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);  
          
        //监听电话状态，接电话时停止播放  
        manager.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE);  
    }  
 
    /* 
     * 监听电话状态 
     */ 
    private final class MyPhoneStateListener extends PhoneStateListener {  
        public void onCallStateChanged(int state, String incomingNumber) {  
            pause();  
        }  
    }  
 
    /* 
     * 播放器监听器 
     */ 
    private final class MyPlayerListener implements OnCompletionListener {  
        //歌曲播放完后自动播放下一首歌曲  
        public void onCompletion(MediaPlayer mp) {  
            next();  
        }  
    }  
 
    /* 
     * 下一首按钮 
     */ 
    public void next(View view) {  
        next();  
    }  
 
    /* 
     * 前一首按钮 
     */ 
    public void previous(View view) {  
        previous();  
    }  
 
    /* 
     * 播放前一首歌 
     */ 
    private void previous() {  
        current = current - 1 < 0 ? data.size() - 1 : current - 1;  
        play();  
    }  
 
    /* 
     * 播放下一首歌 
     */ 
    private void next() {  
        current = (current + 1) % data.size();  
        play();  
    }  
 
    /* 
     * 进度条监听器 
     */ 
    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;  
        }  
    }  
 
    /* 
     * 显示音乐播放列表 
     */ 
    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.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();  
        }  
    }  
 
    /** 
     * 查找文件路径中所有mp3文件 
     * @param file 要找的目录 
     * @param list 用来装文件的List 
     */ 
    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  
            }  
    }  
 
    /* 
     * 暂停/播放按钮 
     */ 
    public void pp(View view) {  
          
        //默认从第一首歌曲开始播放  
        if (!player.isPlaying() && !isPause) {  
            play();  
            return;  
        }  
 
        Button button = (Button) view;  
        //暂停/播放按钮  
        if ("||".equals(button.getText())) {  
            pause();  
            button.setText("▶");  
        } else {  
            resume();  
            button.setText("||");  
        }  
    }  
 
    /* 
     * 开始操作 
     */ 
    private void resume() {  
        if (isPause) {  
            player.start();  
            isPause = false;  
        }  
    }  
 
    /* 
     * 暂停操作 
     */ 
    private void pause() {  
        if (player != null && player.isPlaying()) {  
            player.pause();  
            isPause = true;  
        }  
    }  
 
    /* 
     * 收到广播时暂停 
     */ 
    private final class PhoneListener extends BroadcastReceiver {  
        public void onReceive(Context context, Intent intent) {  
            pause();  
        }  
    }  
 
    /* 
     * 恢复播放 
     * @see android.app.Activity#onResume() 
     */ 
    protected void onResume() {  
        super.onResume();  
        resume();  
    }  
} 

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
      package="cn.itcast.audio" 
      android:versionCode="1" 
      android:versionName="1.0"> 
    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
        <activity android:name=".MainActivity" 
                  android:label="@string/app_name"> 
            <intent-filter> 
                <action android:name="android.intent.action.MAIN" /> 
                <category android:name="android.intent.category.LAUNCHER" /> 
            </intent-filter> 
        </activity> 
 
    </application> 
    <uses-sdk android:minSdkVersion="8" /> 
      
    <!-- 监听电话呼出 --> 
    <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/> 
    <!-- 监听电话状态改变 --> 
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />   
 
</manifest>  

评论

1 楼 deyanglining 2012-05-15