音乐（部分）
PlayerService
package com.anhui.music_player.util;
import java.util.List;
import com.anhui.music_player.model.Music;
import android.app.Service;
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.media.MediaPlayer.OnPreparedListener;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
public class PlayerService extends Service {
private MediaPlayer mediaPlayer; // 媒体播放器对象
private String path; // 音乐文件路径
private boolean isPause; // 暂停状态
private int current = 0; // 记录当前正在播放的音乐
private List<Music> mp3Infos; //存放Mp3Info对象的集合
private int status = 3; //播放状态，默认为顺序播放
private MyReceiver myReceiver; //自定义广播接收器
private int currentTime; //当前播放进度
private int duration; //播放长度
//服务要发送的一些Action
public static final String UPDATE_ACTION = "com.wwj.action.UPDATE_ACTION"; //更新动作
public static final String CTL_ACTION = "com.wwj.action.CTL_ACTION"; //控制动作
public static final String MUSIC_CURRENT = "com.wwj.action.MUSIC_CURRENT"; //当前音乐播放时间更新动作
public static final String MUSIC_DURATION = "com.wwj.action.MUSIC_DURATION";//新音乐长度更新动作
/**
* handler用来接收消息，来发送广播更新播放时间
*/
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == 1) {
if(mediaPlayer != null) {
currentTime = mediaPlayer.getCurrentPosition(); // 获取当前音乐播放的位置
Intent intent = new Intent();
intent.setAction(MUSIC_CURRENT);
intent.putExtra("currentTime", currentTime);
sendBroadcast(intent); // 给PlayerActivity发送广播
handler.sendEmptyMessageDelayed(1, 1000);
}
}
};
};
@Override
public void onCreate() {
super.onCreate();
Log.d("service", "service created");
mediaPlayer = new MediaPlayer();
mp3Infos =MusicList.getMusicData(this);
/**
* 设置音乐播放完成时的监听器
*/
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp1) {
if (status == 1) { // 单曲循环
mediaPlayer.start();
}
else if (status == 2) { // 全部循环
current++;
if(current > mp3Infos.size() - 1) { //变为第一首的位置继续播放
current = 0;
}
} else if (status == 3) { // 顺序播放
current++; //下一首位置
if (current <= mp3Infos.size() - 1) {
Intent sendIntent = new Intent(UPDATE_ACTION);
sendIntent.putExtra("current", current);
// 发送广播，将被Activity组件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
path = mp3Infos.get(current).getUrl();
play(0);
}else {
mediaPlayer.seekTo(0);
current = 0;
Intent sendIntent = new Intent(UPDATE_ACTION);
sendIntent.putExtra("current", current);
// 发送广播，将被Activity组件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
}
} else if(status == 4) { //随机播放
current = getRandomIndex(mp3Infos.size() - 1);
System.out.println("currentIndex ->" + current);
Intent sendIntent = new Intent(UPDATE_ACTION);
sendIntent.putExtra("current", current);
// 发送广播，将被Activity组件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
path = mp3Infos.get(current).getUrl();
play(0);
}
}
});
myReceiver = new MyReceiver();
IntentFilter filter = new IntentFilter();
registerReceiver(myReceiver, filter);
}
/**
* 获取随机位置
* @param end
* @return
*/
protected int getRandomIndex(int end) {
int index = (int) (Math.random() * end);
return index;
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
/**
* 播放音乐
*
* @param position
*/
private void play(int currentTime) {
try {
mediaPlayer.reset();// 把各项参数恢复到初始状态
mediaPlayer.setDataSource(path);
mediaPlayer.prepare(); // 进行缓冲
mediaPlayer.setOnPreparedListener(new PreparedListener(currentTime));// 注册一个监听器
handler.sendEmptyMessage(1);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 暂停音乐
*/
private void pause() {
if (mediaPlayer != null && mediaPlayer.isPlaying()) {
mediaPlayer.pause();
isPause = true;
}
}
private void resume() {
if (isPause) {
mediaPlayer.start();
isPause = false;
}
}
/**
* 上一首
*/
private void previous() {
Intent sendIntent = new Intent(UPDATE_ACTION);
sendIntent.putExtra("current", current);
// 发送广播，将被Activity组件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
play(0);
}
/**
* 下一首
*/
private void next() {
Intent sendIntent = new Intent(UPDATE_ACTION);
sendIntent.putExtra("current", current);
// 发送广播，将被Activity组件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
play(0);
}
/**
* 停止音乐
*/
private void stop() {
if (mediaPlayer != null) {
mediaPlayer.stop();
try {
mediaPlayer.prepare(); // 在调用stop后如果需要再次通过start进行播放,需要之前调用prepare函数
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Override
public void onDestroy() {
if (mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
}
}
/**
*
* 实现一个OnPrepareLister接口,当音乐准备好的时候开始播放
*
*/
private final class PreparedListener implements OnPreparedListener {
private int currentTime;
public PreparedListener(int currentTime) {
this.currentTime = currentTime;
}
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start(); // 开始播放
if (currentTime > 0) { // 如果音乐不是从头播放
mediaPlayer.seekTo(currentTime);
}
Intent intent = new Intent();
intent.setAction(MUSIC_DURATION);
duration = mediaPlayer.getDuration();
intent.putExtra("duration", duration); //通过Intent来传递歌曲的总长度
sendBroadcast(intent);
}
}
public class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
int control = intent.getIntExtra("control", -1);
switch (control) {
case 1:
status = 1; // 将播放状态置为1表示：单曲循环
break;
case 2:
status = 2; //将播放状态置为2表示：全部循环
break;
case 3:
status = 3; //将播放状态置为3表示：顺序播放
break;
case 4:
status = 4; //将播放状态置为4表示：随机播放
break;
}
}
}
}
MusicList 获取所有歌曲
package com.anhui.music_player.util;
public class MusicList {
public static List<Music> getMusicData(Context context) {
List<Music> musicList = new ArrayList<Music>();
ContentResolver cr = context.getContentResolver();
if (cr != null) {
// 获取所有歌曲
Cursor cursor = cr.query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null,
null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
if (null == cursor) {
return null;
}
if (cursor.moveToFirst()) {
do {
Music m = new Music();
String title = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.TITLE));
String singer = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST));
if ("<unknown>".equals(singer)) {
singer = "未知艺术家";
}
String album = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ALBUM));
long size = cursor.getLong(cursor
.getColumnIndex(MediaStore.Audio.Media.SIZE));
long time = cursor.getLong(cursor
.getColumnIndex(MediaStore.Audio.Media.DURATION));
String url = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DATA));
String name = cursor
.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
String sbr = name.substring(name.length() - 3,
name.length());
if (sbr.equals("mp3")) {
m.setTitle(title);
m.setSinger(singer);
m.setAlbum(album);
m.setSize(size);
m.setTime(time);
m.setUrl(url);
m.setName(name);
musicList.add(m);
}
} while (cursor.moveToNext());
}
if (cursor != null) {
cursor.close();
}
}
return musicList;
}
}