接收新的FCM消息（前台和后台）时Android应用程序崩溃

Posted 2021-04-08

我正在努力在我的应用中实施FCM。我正在按照文档中的指南进行操作，并尝试按照文档中的建议实现一个简单的测试，但每当我从控制台发送通知时，应用程序崩溃，天气就在前台或后台。

**更新：我已经删除了服务类，它在gradle中的减速和实现。如果我尝试测试消息，应用程序仍会崩溃。它不应该完全不受它的影响吗？

这是我的扩展课程：

import android.util.Log
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.iid.FirebaseInstanceId
import com.google.firebase.messaging.FirebaseMessagingService
import com.google.firebase.messaging.RemoteMessage

class MyFirebaseMessagingService : FirebaseMessagingService() {

    override fun onMessageReceived(p0: RemoteMessage?) {
        super.onMessageReceived(p0)

        Log.d("newMessage", p0!!.notification!!.body)
    }

    override fun onNewToken(p0: String?) {
        super.onNewToken(p0)
        FirebaseInstanceId.getInstance().instanceId.addOnSuccessListener { idResult ->
            val uid = FirebaseAuth.getInstance().uid ?: ""

            val token = idResult.token

            val userRef = FirebaseDatabase.getInstance().getReference("/users/$uid/services/firebase-token")
            userRef.setValue(token)
        }
    }
}

这是我的表现：

    <service
            android:name=".otherClasses.MyFirebaseMessagingService"
            android:exported="false">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
    </service>

这是崩溃日志：

2019-04-18 11:45:44.007 21257-21295/co.getdere E/AndroidRuntime: FATAL EXCEPTION: Firebase-WrappedFirebaseMessagingService
    Process: co.getdere, PID: 21257
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
        at android.content.ContextWrapper.getPackageName(ContextWrapper.java:135)
        at com.google.firebase.messaging.zzb.<init>(Unknown Source:5)
        at com.google.firebase.messaging.FirebaseMessagingService.zzd(Unknown Source:58)
        at com.google.firebase.iid.zzb.run(Unknown Source:2)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
        at com.google.android.gms.common.util.concurrent.zza.run(Unknown Source:6)
        at java.lang.Thread.run(Thread.java:764)

答案

试试吧。它可能会奏效

class MyFirebaseMessagingService : FirebaseMessagingService() {
    companion object {

        private val TAG = "MyFirebaseMsgService"
    }

    override fun onNewToken(s: String?) {
        super.onNewToken(s)
        //        Displaying token on logcat
        Log.e(TAG, "Refreshed token: " + s!!)
    }

    override fun onMessageReceived(remoteMessage: RemoteMessage?) {
        Log.e(TAG, "onMessageReceived")
    }    
}

将其添加到清单文件中

 <service
     android:name=".fcm.MyFirebaseMessagingService"
      android:exported="false">
      <intent-filter>
     <action android:name="com.google.firebase.MESSAGING_EVENT" />
      </intent-filter>
    </service>