android - 通知中的播放/暂停按钮图像，Android

Question

我已经实现了音乐播放器，它会在播放流式音频时触发自定义通知。

一切正常，我可以使用通知中的按钮播放/暂停音频。唯一的问题是图像按钮:它无法通过单击按钮来指示播放/暂停来更改图像。

在 RemoteReceiver 中使用 remoteViews.setImageViewResource() 无效。使用 BroadcastReceiver 完成控制，这是从播放器 Activity 触发通知的代码:

  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);
  }

notification.xml内容为

<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>

这是 RemoteRecivier 类

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);
            }
        }
    }
}

最后， list 是

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


        </receiver>

<activity android:name="PlayerActivity" />

Answer 1

您必须在更改后将 notification.contentView 设置为新的 remoteView，以便它可以更新通知 View 本身。

意思是，在您的 BroadcastReceiver 中收到操作后，使用所需的按钮显示(暂停或播放)重新构建您的通知

希望对你有帮助