NotificationListenerService:getActiveNotifications 上的 NullPointerException [英] NotificationListenerService: NullPointerException on getActiveNotifications

问题描述

我正在尝试根据本教程在我的应用程序中实现 NotificationListenerService:http://www.kpbird.com/2013/07/android-notificationlistenerservice.html，但我在调用 getActiveNotifications 时遇到 NullPointerException.

I'm trying to implement the NotificationListenerService in my application according to this tutorial: http://www.kpbird.com/2013/07/android-notificationlistenerservice.html ,but i'm having a NullPointerException when calling getActiveNotifications.

Caused by: java.lang.NullPointerException
at android.os.Parcel.readException(Parcel.java:1437)
at android.os.Parcel.readException(Parcel.java:1385)


at android.app.INotificationManager$Stub$Proxy.getActiveNotificationsFromListener(INotificationManager.java:500)
at android.service.notification.NotificationListenerService.getActiveNotifications(NotificationListenerService.java:149)
at com.rootsoft.rsnotificationservice.RSNotificationService.activeNot(RSNotificationService.java:85)
at com.rootsoft.rsnotificationservice.RSNotificationService.access$0(RSNotificationService.java:81)
at com.rootsoft.rsnotificationservice.RSNotificationService$1.onReceive(RSNotificationService.java:105)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:763)
... 9 more

我正在向服务发送广播，该广播应该生成所有通知的列表:

I'm sending a broadcast to the service which should generate a list of all Notifications:

private void activeNot () {
    List l = new List();
    l.Initialize();

    for (StatusBarNotification sbn : getActiveNotifications() ) { <---- Error happens here
        l.Add(sbn);
    }

    Log.i("B4A", "List created.");


    }
}

推荐答案

从那以后，我了解了更多关于这个的知识并开始工作！

注意:首先，请确保您已在 Android 设备的通知访问设置面板中启用您的应用.

直到现在我遇到了完全相同的问题.事实证明，覆盖 onBind 是危险的.如果确实覆盖了 onBind，则必须返回 super.onBind(intent) 返回的相同 IBinder.如果您想返回自己的自定义绑定器，请确保使用唯一的 Intent，并且仅在收到自定义 Intent 时才返回您的自定义绑定器.

I had the exact same problem until now. Turns out, overriding onBind is dangerous. If you do override onBind, you have to return the same IBinder that super.onBind(intent) returns. If you want to return your own custom binder, make sure you use a unique intent, and only return your custom binder when the custom intent is received.

@Override
public IBinder onBind(Intent intent)
{
    if (intent.getAction().equals("custom_intent"))
    {
        return customBinder;
    }
    else
    {
        return super.onBind(intent);
    }
}

一旦您授予它读取通知的权限，系统就会在您的服务上调用 onBind.如果您的 onBind 向系统返回自定义绑定器，系统将不会给您通知，并且可能导致空指针或安全异常.

The system calls onBind on your service, once you have granted it permission to read Notifications. If your onBind returns a custom binder to the system, the system will not give you the notifications, and could lead to Null Pointer or Security Exceptions.

希望这有帮助！

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