为什么NotificationListenerService无法正常工作

Question

我在没有太多运气的情况下与NotificationListenerService作斗争.我尝试了很多在这里和那里找到的食谱,特别是这样......但它的作用相当不一致.

首先看一下代码:

清单:

<service
    android:name=".services.NLService"
    android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE" >
    <intent-filter>
        <action android:name="android.service.notification.NotificationListenerService" />
    </intent-filter>
</service>

那么服务本身:

public class NLService extends NotificationListenerService {

    private String TAG = "NLService";

    // bind and unbind seems to make it work with Android 6...
    // but is never called with Android 4.4... 
    @Override
    public IBinder onBind(Intent mIntent) {
        IBinder mIBinder = super.onBind(mIntent);
        Log.i(TAG, "onBind");
        return mIBinder;
    }

    @Override
    public boolean onUnbind(Intent mIntent) {
        boolean mOnUnbind = super.onUnbind(mIntent);
        Log.i(TAG, "onUnbind");
        isNotificationAccessEnabled = false;
        try {
        } catch (Exception e) {
            Log.e(TAG, "Error during unbind", e);
        }
        return mOnUnbind;
    }

    // onCreate is called with Android 4.4 
    // because the service is explicitly started from the MainActivity.
    // Not on Android 6 where the system binds this service itself...

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "**********  onCreate");

    @Override
    public void onNotificationPosted(StatusBarNotification sbn) {

        Log.i(TAG, "**********  onNotificationPosted");
        Log.i(TAG, "ID :" + sbn.getId() + "\t" + sbn.getNotification().tickerText + "\t" + sbn.getPackageName());
    }

    @Override
    public void onNotificationRemoved(StatusBarNotification sbn) {
        Log.i(TAG, "********** onNOtificationRemoved");
        Log.i(TAG, "ID :" + sbn.getId() + "\t" + sbn.getNotification().tickerText + "\t" + sbn.getPackageName());
    }
}

在主Activity中,服务已启动,或者我们要求用户在需要时启用该设置:

if (!Utilities.hasNotificationAccess(this)) 
{
     Intent intent = new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");
     startActivity(intent);
     Log.i(TAG,"hasNotificationAccess NO");
}
else
{
    Log.i(TAG,"hasNotificationAccess YES");

    // without this startService, it never works with Android 4.4...
    // but this is not needed in Android 6... 
    Intent mServiceIntent = new Intent(this, NLService.class);
    startService(mServiceIntent);
}

显然,启用了通知的安全设置访问权限......

在Android 6上:

在NLService本身,添加onBind和onUnbind方法使它工作,我可以查看onBind日志,并且onNotificationPosted被很好地触发.但它一直持续到下一次启动应用程序,然后没有更多绑定,没有更多onNotificationPosted,只是没有任何反应,直到我回到安全设置取消选中 - 重新检查通知访问:每次启动应用程序时重复此操作是不可能的在生产环境中.

在Android 4.4上:

与Android 6相比,在MainActivity中我需要显式启动NLService,否则它本身就不会有统计信息.但是它再次适用于第一次启动,并且在取消检查安全设置之前永远不会再次运行...

我错过了一些明显的东西吗

Answer 1

Android缓存存在问题.在设备上上传应用程序时,操作系统会将您的服务连接到Notification Manager.如果您之前运行过您的应用,Android会在缓存中创建此服务,因此不会重新连接.

解决方法:在您的设备上推送应用程序之前,重命名您的服务(Android Studio中的重构选项效果很好) - Android会将此服务识别为新服务并连接到Notification Manager.

https://developer.android.com/reference/android/service/notification/NotificationListenerService.html#onListenerConnected() - 连接到Notification Manager后将调用此方法,以便检查您的服务是否已连接.