Question

我想在前台服务运行时在状态栏中更改通知smallIcon，具体取决于该服务收集的状态，即“静音”或“取消静音”。

要显示smallIcons资源中的备用res.drawable，需要做什么？

在服务类的initialize方法中，我目前将静音图标设置如下，但是在启动服务后我不知道如何更改它：

NotificationCompat.Builder builder = new NotificationCompat.Builder(
        this, NOTE_CHANNEL_ID)
        .setSmallIcon(R.drawable.mute_icon)
        .setContentTitle("Calm: Running")
        .setContentText(this.getString(R.string.calm_close_txt))
        .setOngoing(true)
        .setContentIntent(stopIntent);

startForeground(NOTIFICATION_ID, builder.build());

Answer 1

您只需要保留对NotificationCompat.Builder的引用。然后使用notify(int id, Notification notification)的{{1}}方法。

示例：

NotificationManagerCompat

Answer 2

解决方法是仅创建带有新图标的新通知，以替换旧的通知。

编辑：这是一个示例代码，用于使用基于名为indicator的布尔变量的示例逻辑在每次单击按钮时创建新的通知。

findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //Create the notification builder object
        NotificationCompat.Builder builder = new NotificationCompat.Builder(v.getContext(), NOTE_CHANNEL_ID)
                .setSmallIcon(indicator ? R.drawable.icon1 : R.drawable.icon2)   //TODO: change this line with your logic
                .setContentTitle("Your notification title here")
                .setContentText("Your notificiation text here")
                .setPriority(NotificationCompat.PRIORITY_HIGH)
//                        .setContentIntent(pendingIntent)    //pendingIntent to fire when the user taps on it
                .setAutoCancel(true);   //autoremove the notificatin when the user taps on it

        //show the notification constructed above
        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(v.getContext());
        notificationManager.notify(NOTIFICATION_ID, builder.build());

        indicator = !indicator; //switch icon indicator (just for demonstration)
    }
});

服务运行时如何更改状态栏图标

2 个答案: