Question

我正在我的应用程序中集成Firebase实时数据库，我按照添加说明操作，但它总是抛出异常

没有虚拟方法

FATAL EXCEPTION: main
  Process: appsTest.test, PID: 17680
  java.lang.NoSuchMethodError: No virtual method zzcnu()Z in class Lcom/google/firebase/FirebaseApp; or its super classes (declaration of 'com.google.firebase.FirebaseApp' appears in /data/app/appsTest.test-2/base.apk:classes15.dex)
      at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source)
      at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source)
      at appsTest.test.inAppViews.newsFeedScreen.NewsFeedFragment.<init>(NewsFeedFragment.java:31)
      at appsTest.test.inAppViews.BaseActivity.onClickOnTab(BaseActivity.java:144)
      at appsTest.test.inAppViews.BaseActivity.onTabSelected(BaseActivity.java:258)
      at com.ashokvarma.bottomnavigation.BottomNavigationBar.sendListenerCall(BottomNavigationBar.java:578)
      at com.ashokvarma.bottomnavigation.BottomNavigationBar.selectTabInternal(BottomNavigationBar.java:558)
      at com.ashokvarma.bottomnavigation.BottomNavigationBar.access$000(BottomNavigationBar.java:44)
      at com.ashokvarma.bottomnavigation.BottomNavigationBar$1.onClick(BottomNavigationBar.java:502)
      at android.view.View.performClick(View.java:6213)
      at android.view.View$PerformClick.run(View.java:23645)
      at android.os.Handler.handleCallback(Handler.java:751)
      at android.os.Handler.dispatchMessage(Handler.java:95)
      at android.os.Looper.loop(Looper.java:154)
      at android.app.ActivityThread.main(ActivityThread.java:6692)
      at java.lang.reflect.Method.invoke(Native Method)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)

Project gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.2'
        classpath 'com.google.gms:google-services:3.0.0'
    }
}

App模块gradle：

compile "com.google.firebase:firebase-messaging:+"
compile "com.google.firebase:firebase-core:9.6.1"
compile 'com.google.firebase:firebase-database:9.6.1'
apply plugin: 'com.google.gms.google-services' // this code at the end of gradle file

在OnCreate方法中在片段内初始化FireBase数据库：

    DatabaseReference mRootRefernce = FirebaseDatabase.getInstance().getReference(); // at this line the exception happened
    DatabaseReference reference = mRootRefernce.child("feed");

Answer 1

由以下内容确定：

将相同版本用于Google Play服务（3.1.0）
更新所有依赖旧版Google Play服务的图书馆，在我的案例中，OneSignal图书馆为最新版本

Answer 2

尝试使用最新版本的firebase。

compile 'com.google.firebase:firebase-database:11.2.0'
compile 'com.google.firebase:firebase-core:11.2.0'

谷歌服务：

classpath 'com.google.gms:google-services:3.1.0'

app / build.gradle中的

到底有没有？

apply plugin: 'com.google.gms.google-services'

Firebase getInstance总是抛出没有虚方法异常

2 个答案: