在调试模式下运行时，Notification Listener Service未启动 [英] Notification Listener Service not started when running in debug mode

问题描述

我正在使用NotificationListenerService构建应用程序.但总是在以调试模式运行该应用程序时，该服务不会启动.我将代码简化为以下内容:

I am building an app using the NotificationListenerService. But always when I run the app in debug mode the Service is not started. I reduced my code to the following:

我的行为:

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val intent = Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS")
        startActivity(intent)
    }

    override fun onResume() {
        super.onResume()
        val isServiceRunning = isMyServiceRunning(NLService::class.java)
        Log.i("MainActivity", "service running: " + isServiceRunning)

    }

    private fun isMyServiceRunning(serviceClass: Class<*>): Boolean {
        val manager = getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
        for (service in manager.getRunningServices(Integer.MAX_VALUE)) {
            if (serviceClass.name == service.service.className) {
                return true
            }
        }
        return false
    }
}

服务:

class NLService : NotificationListenerService() {

    private val TAG: String? = "NLService"

    override fun onBind(intent: Intent): IBinder? {
        Log.i(TAG, "onBind()")
        return super.onBind(intent)
    }

    override fun onCreate() {
        super.onCreate()
        Log.i(TAG, "onCreate()")
    }

    override fun onDestroy() {
        super.onDestroy()
    }

    override fun onNotificationPosted(sbn: StatusBarNotification?) {
        Log.i(TAG, "onNotificationPosted() sbn: $sbn")
        super.onNotificationPosted(sbn)
    }
}

我当然在清单中添加了它:

Of course I added this in manifest:

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

</service>

在调试模式下启动应用程序时，我总是在onResume中获得日志输出service running: false.正常启动且未调试时，该值为true.发生了什么问题以及如何解决?

When starting the app in debug mode then I always get the log output service running: false in onResume. The value is true when starting normally, without debug. What is going wrong and how to fix that?

推荐答案

好吧，最后我没有一个完整的解决方案，但有一种接近于可行解决方案的改进.

Okay, finally I don't have a complete solution but a kind of improvement which is close to a working solution.

那么我原始的应用程序代码中实际存在哪些技术问题?而我该如何解决呢?

So what are actually the technical problems in my original app code? And how did I solve them?

1. 我在NLService类的onConnect()方法中进行了一些初始化.我将所有初始化都移到了onListenerConnected()，并添加了handler.postDelayed(runnable, 500);.
2. 我在NLService类中创建了一个类的对象(我们称其为MyHandlerClass)，并向其中传递了对Service的引用.这不是一个好的解决方案，因为Android

1. I made some initialization in NLService class' onConnect() method. I moved all this initialization to onListenerConnected(), adding a handler.postDelayed(runnable, 500);.
2. I created an object of a class (Let's call it MyHandlerClass) within the NLService class and passed a reference to the Service into it. This is not a good solution because Android documentation says something about many methods within the NotificationListenerService:

服务应在执行此操作之前等待onListenerConnected()事件.

The service should wait for the onListenerConnected() event before performing this operation.

因此在MyHandlerClass中，我称nlService.getActiveNotifications().在Android呼叫NLService s'onListenerConnected之前，此呼叫是也许进行的.因此，我为NLService中的方法制作了包装器，例如:

So in MyHandlerClass I called a nlService.getActiveNotifications(). This call was made maybe before Android called NLServices' onListenerConnected. So I made wrappers for methods inside NLService, like e.g.:

fun getActiveNotifications(): Array<StatusBarNotification>?
{
    return if (isConnected)
    {
        super.getActiveNotifications()
    }
    else
    {
        null
    }
}

然后我在onListenerConnected()和onListenerDisconnected()

现在，在调试模式下运行应用程序时，服务仍会崩溃.但是在正常模式下运行，可以通过上述改进来减少崩溃的数量.

Now the service still crashes when running app in debug mode. But running in normal mode the amount of crashes could be reduced by the described improvements.

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