本文记录了一种实现Android后台音乐播放的方法，通过通知栏控制音乐播放。利用Service播放音乐，并使用RemoteView自定义Notification，通过PendingIntent实现点击通知栏控制音乐播放的功能。
最近要制作一个后台播放音乐的功能，可是在UI中不给控制按钮，于是只好通过通知栏来控制了，网上找了许多，没有找到相关的文章，经过不断摸索，终于实现了该功能，在此记录下来，即作为备忘，也可作为分享。
1、首先，创建一个service来播放音乐：
public class AudioService extends Service {
private MediaPlayer mediaPlayer;
private final static String TAG = "debug";
public ButtonBroadcastReceiver bReceiver;
public final static String ACTION_BUTTON = "com.weidongjian.weigan.ButtonClick";
public NotificationManager mNotificationManager;
@Override
public void onCreate() {
super.onCreate();
Log.i("debug", "oncrete");
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource("http://abv.cn/music/%E5%85%89%E8%BE%89%E5%B2%81%E6%9C%88.mp3");
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); initButtonReceiver();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("debug", "onStartCommnad");
if (!mediaPlayer.isPlaying()){
mediaPlayer.start();
}
showButtonNotify();
return START_STICKY;
}
public void onDestroy(){
Log.i("debug", "onDestory");
//super.onDestroy();
if(mediaPlayer.isPlaying()){
mediaPlayer.stop();
}
mediaPlayer.release();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}我在onCreate里面，初始化了MediaPlayer对象，并用于播放网络地址音乐，并有一个初始化Receive的公式： initButtonReceiver();，这个留到后面讲。
2、第二部是创建一个Notification了，这个在网上有许多的资源了，我这里用的是remoteView创建一个自定义的Notification，而且在控制音乐这里，只能用remoteView；
public void showButtonNotify(){
Notification.Builder mBuilder = new Notification.Builder(this);
RemoteViews mRemoteViews = new RemoteViews(getPackageName(), R.layout.view_custom_button);
mRemoteViews.setImageViewResource(R.id.custom_song_icon, R.drawable.sing_icon);
mBuilder.setContent(mRemoteViews)
.setContentIntent(getDefalutIntent(Notification.FLAG_ONGOING_EVENT))
.setWhen(System.currentTimeMillis())// 通知产生的时间，会在通知信息里显示
.setTicker("正在播放")
.setPriority(Notification.PRIORITY_DEFAULT)// 设置该通知优先级
.setOngoing(true)
.setSmallIcon(R.drawable.sing_icon);
Notification notify = mBuilder.build();
notify.flags = Notification.FLAG_ONGOING_EVENT;
//会报错，还在找解决思路
// notify.contentView = mRemoteViews;
// notify.contentIntent = PendingIntent.getActivity(this, 0, new Intent(), 0);
mNotificationManager.notify(200, notify);
}这个是RemoteView的layout：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView
android:id="@+id/custom_song_icon"
android:layout_width="64dp"
android:layout_height="64dp"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:src="@drawable/sing_icon" />
<LinearLayout
android:id="@+id/ll_custom_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginLeft="5dip"
android:gravity="center_vertical"
android:orientation="horizontal" >
<ImageButton
android:id="@+id/btn_custom_prev"
style="@style/btn_custom_style"
android:src="@drawable/btn_prev" />
<ImageButton
android:id="@+id/btn_custom_play"
style="@style/btn_custom_style"
android:contentDescription="播放"
android:src="@drawable/btn_play" />
<ImageButton
android:id="@+id/btn_custom_next"
style="@style/btn_custom_style"
android:contentDescription="下一首"
android:src="@drawable/btn_next" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginBottom="5dip"
android:layout_marginLeft="5dip"
android:layout_marginTop="5dip"
android:layout_toLeftOf="@id/ll_custom_button"
android:layout_toRightOf="@id/custom_song_icon"
android:orientation="vertical" >
<TextView
android:id="@+id/tv_custom_song_singer"
style="@style/NotificationTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="title"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_custom_song_name"
style="@style/NotificationContent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="content"
android:textSize="12sp" />
</RelativeLayout>
</RelativeLayout>现在问题来了，如何处理RemoteView上面的点击事件，并且传给service呢，原来RemoteView有一个可以发广播的方法，如下：
public void setOnClickPendingIntent (int viewId, PendingIntent pendingIntent)
Added in
API level 3
Equivalent to calling setOnClickListener(android.view.View.OnClickListener) to launch the provided PendingIntent. When setting the on-click action of items within collections (eg. ListView, StackView etc.), this method will not work. Instead, use {@link RemoteViews#setPendingIntentTemplate(int, PendingIntent) in conjunction with RemoteViews#setOnClickFillInIntent(int, Intent).
Parameters
| viewId | The id of the view that will trigger the PendingIntent when clicked |
|---|---|
| pendingIntent | The PendingIntent to send when user clicks |
<span style="white-space:pre"> </span> Intent buttonIntent = new Intent(ACTION_BUTTON);
/* 上一首按钮 */
buttonIntent.putExtra(INTENT_BUTTONID_TAG, BUTTON_PREV_ID);
//这里加了广播，所及INTENT的必须用getBroadcast方法
PendingIntent intent_prev = PendingIntent.getBroadcast(this, 1, buttonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
mRemoteViews.setOnClickPendingIntent(R.id.btn_custom_prev, intent_prev);
/* 播放/暂停 按钮 */
buttonIntent.putExtra(INTENT_BUTTONID_TAG, BUTTON_PALY_ID);
PendingIntent intent_paly = PendingIntent.getBroadcast(this, 2, buttonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
mRemoteViews.setOnClickPendingIntent(R.id.btn_custom_play, intent_paly);
/* 下一首 按钮 */
buttonIntent.putExtra(INTENT_BUTTONID_TAG, BUTTON_NEXT_ID);
PendingIntent intent_next = PendingIntent.getBroadcast(this, 3, buttonIntent, PendingIntent.FLAG_UPDATE_CURRENT);
mRemoteViews.setOnClickPendingIntent(R.id.btn_custom_next, intent_next);这样的话，只要在service里面，建立一个receiver，就可以接收广播了，从而操控音乐的播放：
public void initButtonReceiver(){
bReceiver = new ButtonBroadcastReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ACTION_BUTTON);
registerReceiver(bReceiver, intentFilter);
}
public final static String INTENT_BUTTONID_TAG = "ButtonId";
/** 上一首 按钮点击 ID */
public final static int BUTTON_PREV_ID = 1;
/** 播放/暂停 按钮点击 ID */
public final static int BUTTON_PALY_ID = 2;
/** 下一首 按钮点击 ID */
public final static int BUTTON_NEXT_ID = 3;
public class ButtonBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
if(action.equals(ACTION_BUTTON)){
//通过传递过来的ID判断按钮点击属性或者通过getResultCode()获得相应点击事件
int buttonId = intent.getIntExtra(INTENT_BUTTONID_TAG, 0);
switch (buttonId) {
case BUTTON_PREV_ID:
Log.d(TAG , "上一首01");
Toast.makeText(getApplicationContext(), "上一首", Toast.LENGTH_SHORT).show();
break;
case BUTTON_PALY_ID:
Log.d(TAG , "play");
Toast.makeText(getApplicationContext(), play_status, Toast.LENGTH_SHORT).show();
break;
case BUTTON_NEXT_ID:
Log.d(TAG , "next song);
Toast.makeText(getApplicationContext(), "下一首", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
}
}这样我们就可以在service的广播里面处理Notification的点击事件了。
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