Question

我有一个通知，支持播放，前进和后退。

private static Notification createNotification(String interpret, String title, boolean paused) {
//  if (builder == null)
       builder = new NotificationCompat.Builder(context);

    builder.setPriority(Notification.PRIORITY_MAX);
    builder.setAutoCancel(false);
    builder.setContentTitle(title);
    builder.setContentText(interpret);
    builder.setOngoing(true);
    builder.setOnlyAlertOnce(true);
    builder.setSmallIcon(R.drawable.ic_launcher);
    builder.setContentIntent(PendingIntent.getActivity(context, 9, new Intent(context, ApplicationActivity.class), Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT));
    builder.addAction(R.drawable.av_previous, "", PendingIntent.getBroadcast(context.getApplicationContext(), 0, new Intent(NotificationPlayerControlReceiver.MUSIC_PLAYER_INTENT).putExtra("resultcode", NotificationPlayerControlReceiver.PREVIOUS), PendingIntent.FLAG_CANCEL_CURRENT));

    if (paused)
        builder.addAction(R.drawable.av_play, "", PendingIntent.getBroadcast(context.getApplicationContext(), 2, new Intent(NotificationPlayerControlReceiver.MUSIC_PLAYER_INTENT).putExtra("resultcode", NotificationPlayerControlReceiver.PLAY), PendingIntent.FLAG_CANCEL_CURRENT));
    else
        builder.addAction(R.drawable.av_pause, "", PendingIntent.getBroadcast(context.getApplicationContext(), 3, new Intent(NotificationPlayerControlReceiver.MUSIC_PLAYER_INTENT).putExtra("resultcode", NotificationPlayerControlReceiver.PAUSE), PendingIntent.FLAG_CANCEL_CURRENT));

    builder.addAction(R.drawable.av_next, "", PendingIntent.getBroadcast(context.getApplicationContext(), 1, new Intent(NotificationPlayerControlReceiver.MUSIC_PLAYER_INTENT).putExtra("resultcode", NotificationPlayerControlReceiver.NEXT), PendingIntent.FLAG_CANCEL_CURRENT));

    Notification notification = builder.build();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
        notification.tickerView = null;

    return notification;
}

更新通知：

 public static void update(String interpret, String title, boolean paused) {
    NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, createNotification(interpret, title, paused));
}

为避免更新时闪烁，我将构建器设置为全局变量，并在每次更新时重复使用它，这非常有用。但重用它，意味着我添加的所有按钮都被重复使用，并且不可能删除我之前添加的操作。

按钮更改仅在每次更新时重新初始化NotificationCompat.Builder时才有效，这意味着我再次闪烁。

如何避免闪烁，但让按钮改变？

编辑：刚刚检查过Rocket Player，他们也没有解决问题，但Google Play Music确实

Answer 1

就像鲍里斯所说，问题是每次更新都会建立一个新的通知。我的解决方案涵盖相同的逻辑，但我使用NotificationBuilder ...

这是代码：

if (mNotificationBuilder == null) {
            mNotificationBuilder = new NotificationCompat.Builder(this)
                    .setSmallIcon(iconId)
                    .setContentTitle(title)
                    .setContentText(message)
                    .setLargeIcon(largeIcon)
                    .setOngoing(true)
                    .setAutoCancel(false);
        } else {
            mNotificationBuilder.setContentTitle(title)
                    .setContentText(message);
        }

请记住，mNotificationBuilder是班级中的私人字段。

Answer 2

问题是您每次要更新时都会创建新通知。我遇到了同样的问题，并且在我执行以下操作时修复了该问题：

在createNotification。
每次将此实例从通知栏中删除时，将此实例设置为null。
执行以下代码：

代码：

private static Notification createNotification(String interpret, String title, boolean paused) {
   if (mNotification == null) {
       // do the normal stuff you do with the notification builder
   } else {
      // set the notification fields in the class member directly
      ... set other fields.
      // The below method is deprecated, but is the only way I have found to set the content title and text
      mNotification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
   }
   return mNotification;
}

现在当你拨打notify时，不会出现闪烁：

manager.notify(0, createNotification(interpret, title, paused));

PS：我还遇到了一个问题，即如果我执行了setLatestEventInfo，那么大小图标就会被淹没。这就是我做的原因：

int tmpIconResourceIdStore = mNotification.icon;
// this is needed to make the line below not change the large icon of the notification
mNotification.icon = 0;
// The below method is deprecated, but is the only way I have found to set the content title and text
mNotification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
mNotification.icon = tmpIconResourceIdStore;

查看Adnroid ccode此行mNotification.icon = 0;会禁用图标搞砸。

如何在更改按钮时避免闪烁通知更新

2 个答案: