Android编程开发音乐播放器实例

<?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>

<?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>

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>