有人能帮我使用安卓遥控客户端吗

Question

我正在尝试设置RemoteControlClient，以便我的应用程序的音乐可以由锁屏上弹出的小部件控制(如SoundCloud、Google Play music和其他音乐/视频应用程序)。我不确定我的代码出了什么问题，也不确定为什么它没有正确挂钩，但以下是我迄今为止所掌握的。。。

一个名为MusicService的类，它试图处理对RemoteControlClient 的更新

public class MusicService extends Service
{
public static final String ACTION_PLAY = "com.stfi.music.action.PLAY";
private RemoteController controller = null;
@Override
public void onCreate()
{
super.onCreate();
System.out.println("Creating the service.");
if(controller == null)
{
controller = new RemoteController();
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
String action = intent.getAction();
System.out.println("Got an action of " + action);
/* Logic to get my Song cur */
controller.register(this);
controller.updateMetaData(cur);
return START_STICKY;
}
@Override
public void onDestroy()
{
super.onDestroy();
System.out.println("Destorying MusicService");
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}

这使用了一个我称之为RemoteController的类，其中包含我的RemoteControlClient。

public class RemoteController { 
private RemoteControlClient remoteControlClient;
private Bitmap dummyAlbumArt;

public void register(Context context)
{
if (remoteControlClient == null)
{
System.out.println("Trying to register it.");
dummyAlbumArt = BitmapFactory.decodeResource(context.getResources(), R.drawable.dummy_album_art);
AudioManager audioManager = (AudioManager) context.getSystemService(context.AUDIO_SERVICE);
ComponentName myEventReceiver = new ComponentName(context.getPackageName(), MediaButtonReceiver.class.getName());
audioManager.registerMediaButtonEventReceiver(myEventReceiver);
// build the PendingIntent for the remote control client 
Intent mediaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON);
mediaButtonIntent.setComponent(myEventReceiver);
// create and register the remote control client 
PendingIntent mediaPendingIntent = PendingIntent.getBroadcast(context, 0, mediaButtonIntent, 0);
remoteControlClient = new RemoteControlClient(mediaPendingIntent);
remoteControlClient.setTransportControlFlags(RemoteControlClient.FLAG_KEY_MEDIA_PLAY_PAUSE
| RemoteControlClient.FLAG_KEY_MEDIA_NEXT
| RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS
| RemoteControlClient.FLAG_KEY_MEDIA_PLAY
| RemoteControlClient.FLAG_KEY_MEDIA_PAUSE
);
audioManager.registerRemoteControlClient(remoteControlClient);

}
} 
/** 
* Update the state of the remote control. 
*/ 
public void updateState(boolean isPlaying)
{
if(remoteControlClient != null)
{
if (isPlaying)
{
remoteControlClient.setPlaybackState(RemoteControlClient.PLAYSTATE_PLAYING);
}
else
{ 
remoteControlClient.setPlaybackState(RemoteControlClient.PLAYSTATE_PAUSED);
} 
} 
} 
/** 
* Updates the state of the remote control to "stopped". 
*/ 
public void stop()
{ 
if (remoteControlClient != null)
{
remoteControlClient.setPlaybackState(RemoteControlClient.PLAYSTATE_STOPPED);
} 
} 
public void updateMetaData(Song song)
{
if (remoteControlClient != null && song != null)
{
System.out.println("Updating metadata");
MetadataEditor editor = remoteControlClient.editMetadata(true);
editor.putBitmap(MetadataEditor.BITMAP_KEY_ARTWORK, dummyAlbumArt);
editor.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION, (long)1000);
editor.putString(MediaMetadataRetriever.METADATA_KEY_ARTIST, "Artist");
editor.putString(MediaMetadataRetriever.METADATA_KEY_TITLE, "Title");
editor.apply();
updateState(true);
}
}
/** 
* Release the remote control. 
*/ 
public void release() { 
remoteControlClient = null;
} 
} 

每次我想更新小部件时，我都会调用startService(new Intent(MusicService.ACTION_PLAY));。看起来它正确地创建了服务，而且它总是说"更新元数据"，但由于某种原因，当我锁定屏幕并解锁它时，我在锁定屏幕上看不到任何小部件。

以下也是我清单的重要部分，因为这可能会以某种方式导致问题。。。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.stfi"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<application
android:hardwareAccelerated="true"
android:allowBackup="true"
android:icon="@drawable/stfi"
android:label="@string/app_name"
android:largeHeap="true"
android:theme="@style/MyActionBarTheme" >
<meta-data
android:name="android.app.default_searchable"
android:value=".activities.SearchActivity" />
<activity
android:name=".StartingToFeelIt"
android:configChanges="orientation|keyboardHidden"
android:label="@string/app_name"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.app.searchable"
android:resource="@xml/searchable" />
</activity>
...other activities listed
<service
android:name=".helpers.MyNotificationService"
android:enabled="true"
android:label="MyNotificationServiceLabel" >
</service>
<service
android:name=".music.MusicService"
android:exported="false" >
<intent-filter>
<action android:name="com.stfi.music.action.PLAY" />
</intent-filter>
<intent-filter>
<action android:name="com.example.android.musicplayer.action.URL" />
<data android:scheme="http" />
</intent-filter>
</service>
<receiver
android:name=".music.MediaButtonReceiver"
android:exported="false" >
</receiver>
</application>

现在，我的MediaButtonReceiver并没有真正做什么。我只是想把钩子搭好。如果你愿意，这是我的MediaButtonReceiver类。。。

public class MediaButtonReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
System.out.println("Receiving something.");
if (intent.getAction().equals(Intent.ACTION_MEDIA_BUTTON))
{
final KeyEvent event = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
if (event != null && event.getAction() == KeyEvent.ACTION_UP)
{
if (event.getKeyCode() == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE)
{
System.out.println("You clicked pause.");
}
else if(event.getKeyCode() == KeyEvent.KEYCODE_MEDIA_PLAY)
{
System.out.println("You clicked play.");
}
else if (event.getKeyCode() == KeyEvent.KEYCODE_MEDIA_NEXT)
{
System.out.println("You clicked next.");
}
else if (event.getKeyCode() == KeyEvent.KEYCODE_MEDIA_PREVIOUS)
{
System.out.println("You clicked previous.");
}
}
}
}

}

Answer 1

如果在锁定屏幕上看不到remoteControlClient，则必须实现音频聚焦。你可以看看这里