play/pause button image in notification ,Android

问题:

I have implemented music player which fires a custom notification when stream audio is playing.

Everything is working and I can play/pause the audio using the button in the notification. The only problem is the image button: it can't change the image on a click of a button to indicate play/pause.

Using remoteViews.setImageViewResource() in RemoteReceiver is not working. The control is done using BroadcastReceiver and this is the code of firing the notification from the player activity:

  public void setNotification(String songName){
      String ns = Context.NOTIFICATION_SERVICE;
      NotificationManager notificationManager = (NotificationManager) getSystemService(ns);

      @SuppressWarnings("deprecation")
      Notification notification = new Notification(R.drawable.ic_launcher, null, System.currentTimeMillis());

      RemoteViews notificationView = new RemoteViews(getPackageName(), R.layout.notification_view);
      notificationView.setImageViewResource(R.id.button1, R.drawable.pause);
      notificationView.setTextViewText(R.id.textView1, songName);

      //the intent that is started when the notification is clicked (works)
      Intent notificationIntent = new Intent(this, PlayerActivity.class);
      PendingIntent pendingNotificationIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

      notification.contentView = notificationView;
      notification.contentIntent = pendingNotificationIntent;     

      Intent switchIntent = new Intent("com.example.test.ACTION_PLAY");
      PendingIntent pendingSwitchIntent = PendingIntent.getBroadcast(this, 0, switchIntent, PendingIntent.FLAG_UPDATE_CURRENT);

      notificationView.setOnClickPendingIntent(R.id.play_pause, pendingSwitchIntent);
      notificationManager.notify(1, notification);
  }

The notification.xml content is

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">


    <ImageView
        android:layout_alignParentLeft="true"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:src="@drawable/ic_launcher"
        android:id="@+id/imgAppIc" />



    <TextView
        android:layout_toRightOf="@id/imgAppIc"
        android:singleLine="true"
        android:id="@+id/textView1"
        android:ellipsize="marquee"
        android:layout_marginLeft="7dp"
        android:layout_marginTop="10dp"
        android:marqueeRepeatLimit ="marquee_forever"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:scrollHorizontally="true"
        android:layout_width="170dp"
        android:layout_height="wrap_content"/>


    <ImageButton
        android:id="@+id/play_pause"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@+id/play"

         />

</RelativeLayout>

this is the RemoteRecivier class

public class RemoteControlReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {

        RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
                R.layout.notification_view);    

        if(action.equalsIgnoreCase("com.example.test.ACTION_PLAY")){
            if(mediaplayer.isPlaying()){
                mediaplayer.pause();

                remoteViews.setImageViewResource(R.id.button1, R.drawable.play);
            }
            else {
                mediaplayer.start();
                remoteViews.setImageViewResource(R.id.button1, R.drawable.pause);
            }
        }
    }
}

and finally, the manifest is

 <receiver android:name=".RemoteControlReceiver">
            <intent-filter>
                <action android:name="com.Music.app.ACTION_PLAY" />
            </intent-filter>


        </receiver>

<activity android:name="PlayerActivity" />

回答1:

You have to set your notification.contentView to the new remoteView after it was changed so it can update the notification view itself.

Meaning, after you receive the action in your BroadcastReceiver, re-build your notification with the desired button display ( pause or play )

Hope this helps

回答2:

This should work. Just make your notification and notificationManager a static global variable.

public class RemoteControlReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {  

        if(action.equalsIgnoreCase("com.example.test.ACTION_PLAY")){
            if(mediaplayer.isPlaying()){
                mediaplayer.pause();
                notificationView.setImageViewResource(R.id.button1, R.drawable.play);
                notification.contentView = notificationView;
                notificationManager.notify(1, notification);
            }
            else {
                mediaplayer.start();
                notificationView.setImageViewResource(R.id.button1, R.drawable.pause);
                notification.contentView = notificationView;
                notificationManager.notify(1, notification);
            }
        }
    }
}

回答3:

Why not using an ImageView instead of ImageButton? With ImageView, you can simply change its appearance with removeViews.setImageViewResource(R.id.button1, R.drawable.pause);