Question

我正在开发一个Android应用程序，我在其中使用intent服务以一定的周期更新我的firebase项目的位置。但似乎我很早就撞墙了。当我在服务中提供firebase数据库的根引用时，它会崩溃。

当我使用此代码时：

import android.app.IntentService;
import android.content.Intent;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class LocationUpdater extends IntentService{

    public LocationUpdater() {
        super("LocationUpdater");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        synchronized (this){
            try{
                wait(2000);
            }catch (InterruptedException e){
                e.printStackTrace();
            }
        }

    }
}

什么也没做，没关系。但是当我添加这一行时：

private DatabaseReference mRoot = FirebaseDatabase.getInstance().getReference();

在LocationUpdater构造函数上方，应用程序崩溃了。有关为什么会发生这种情况的任何想法？提前谢谢！

这是logcat中的错误输出：

java.lang.RuntimeException: Unable to instantiate service com.mohana.cluster.LocationUpdater: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.mohana.cluster. Make sure to call FirebaseApp.initializeApp(Context) first.
                                                                        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3168)
                                                                        at android.app.ActivityThread.-wrap5(ActivityThread.java)
                                                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1563)
                                                                        at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                        at android.os.Looper.loop(Looper.java:154)
                                                                        at android.app.ActivityThread.main(ActivityThread.java:6123)
                                                                        at java.lang.reflect.Method.invoke(Native Method)
                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
                                                                     Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.mohana.cluster. Make sure to call FirebaseApp.initializeApp(Context) first.
                                                                        at com.google.firebase.FirebaseApp.getInstance(Unknown Source)
                                                                        at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source)
                                                                        at com.mohana.cluster.LocationUpdater.<init>(LocationUpdater.java:11)
                                                                        at java.lang.Class.newInstance(Native Method)
                                                                        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3165)
                                                                        at android.app.ActivityThread.-wrap5(ActivityThread.java) 
                                                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1563) 
                                                                        at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                        at android.os.Looper.loop(Looper.java:154) 
                                                                        at android.app.ActivityThread.main(ActivityThread.java:6123) 
                                                                        at java.lang.reflect.Method.invoke(Native Method) 
                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)

Answer 1

您正试图获取Firebase的实例而不首先实际初始化它。确保在尝试调用Firebase实例之前初始化Firebase。

FirebaseApp.initializeApp(this);

Android意图服务在firebase数据库引用上崩溃

1 个答案: