Android开发音乐播放器

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音乐播放器中综合了以下内容：

SeekBar、ListView、广播接收者(以代码的形式注册Receiver)、系统服务、MediaPlayer

实现的功能：

1.暂停/播放、下一首/上一首，点击某一首时播放

2.支持拖动进度条快进

3.列表排序

4.来电话时，停止播放，挂断后继续播放

5.可在后台播放

效果图：

界面：

main.xml：

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<?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：

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<?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>  

MainActivity:

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();}}

注册权限：

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<?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>   

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