无法在Android中设置Firebase数据库

我最近开始使用Google Firebase for Android。我有some trouble with it.但我尝试手动设置Firebase，现在我收到了一个新错误。我相信它必须对gradle做些什么。无法在Android中设置Firebase数据库

我的build.gradle（APP）：

apply plugin: 'com.android.application' 
//apply plugin: 'com.google.gms.google-services' 

android { 
    compileSdkVersion 23 
    buildToolsVersion "24.0.1" 
    defaultConfig { 
     applicationId "com.example.nirmal.ilistensinch" 
     minSdkVersion 16 
     targetSdkVersion 23 
     versionCode 1 
     versionName "1.0" 
     testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 
     multiDexEnabled true 
    } 
    buildTypes { 
     release { 
      minifyEnabled false 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 

     } 
    } 
} 

dependencies { 
    compile fileTree(include: ['*.jar'], dir: 'libs') 
    /*androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 
     exclude group: 'com.android.support', module: 'support-annotations' 
    })*/ 
    compile 'com.google.firebase:firebase-database:10.0.1' 
    compile 'com.android.support:appcompat-v7:23.0.0' 
    compile 'com.android.support:design:23.0.0' 
    compile 'com.android.support:support-v4:23.0.0' 
    compile 'com.android.support:cardview-v7:23.0.1' 
    compile 'com.android.support:recyclerview-v7:23.0.1' 
    testCompile 'junit:junit:4.12' 
    compile files('/media/win/Android Apps/IlistenSinch/sinch-android-rtc-3.9.10.jar') 
}

我的build.gradle（项目）：

buildscript { 
    repositories { 
     jcenter() 
    } 
    dependencies { 
     classpath 'com.android.tools.build:gradle:2.2.3' 
     classpath 'com.google.gms:google-services:3.0.0' 
//  apply plugin: 'com.google.gms.google-services' 
     // NOTE: Do not place your application dependencies here; they belong 
     // in the individual module build.gradle files 
    } 
} 

allprojects { 
    repositories { 
     jcenter() 
    } 
} 

task clean(type: Delete) { 
    delete rootProject.buildDir 
}

但是当我运行的代码我收到以下错误

Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.nirmal.ilistensinch. 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.example.nirmal.ilistensinch.SinchLoginActivity.onCreate(SinchLoginActivity.java:46) 
                        at android.app.Activity.performCreate(Activity.java:5264) 
                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088) 
                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302) 
                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)  
                        at android.app.ActivityThread.access$800(ActivityThread.java:151)  
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)  
                        at android.os.Handler.dispatchMessage(Handler.java:110)  
                        at android.os.Looper.loop(Looper.java:193)  
                        at android.app.ActivityThread.main(ActivityThread.java:5292)  
                        at java.lang.reflect.Method.invokeNative(Native Method)  
                        at java.lang.reflect.Method.invoke(Method.java:515)  
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)  
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)  
                        at dalvik.system.NativeStart.main(Native Method)

如果您发现我的build.gradle(app)您可以看到我已注释apply plugin: 'com.google.gms.google-services'

如果我拿出这一评论我收到此错误：

Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'. 
> com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/google/android/gms/common/api/zza.class

如何解决这个问题的任何想法？

来源

2017-01-04 Tyson

你下载/'包括谷歌services.json'在您的项目（按https：//开头firebase.google.com/docs/android/setup）？ –

@ JohnO'Reilly我在我的应用程序中有'google-services.json' – Tyson

把apply plugin: 'com.google.gms.google-services'在您的应用程序的build.gradle

... 
    testCompile 'junit:junit:4.12' 
    compile files('/media/win/Android Apps/IlistenSinch/sinch-android-rtc-3.9.10.jar') 
} 
apply plugin: 'com.google.gms.google-services'

下你应该阅读this official Firebase setup guide for Android

来源

2017-01-04 14:18:09 Wilik

它工作正常.....但你能解释一下发生了什么吗？ – Tyson

对不起，我不明白gradle是如何工作的。 :) 我只是按照官方文档。 – Wilik

你可以帮助与这个问题链接的其他问题 – Tyson

无法在Android中设置Firebase数据库

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