Gradle 错误：任务':app:processDebugGoogleServices'执行失败，请确保首先调用 FirebaseApp.initializeApp(Context)

Question

我正在尝试使用firebase执行一个简单的电子邮件和密码活动。

我的build.gradle(应用程序(：

apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.sidharth.android.firebase3login"
minSdkVersion 21
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.firebase:firebase-core:16.0.1'
implementation 'com.google.firebase:firebase-crash:16.0.1'
implementation 'com.google.firebase:firebase-auth:16.0.2'
/*include the databse jar file*/
implementation 'com.google.firebase:firebase-database:16.0.1'
}

主要活动.java

package com.sidharth.android.firebase3login;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseApp;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
public class MainActivity extends Activity {
private EditText mEmail, mPassword;
private Button btnLogin;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener authStateListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FirebaseApp.initializeApp(this);
mAuth = FirebaseAuth.getInstance();
mEmail = findViewById(R.id.emailField);
mPassword = findViewById(R.id.passwordField);
btnLogin = findViewById(R.id.loginBtn);
authStateListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if (firebaseAuth.getCurrentUser() != null) {
startActivity(new Intent(MainActivity.this, HomeActivity.class));
}
}
};
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startSign();
}
});
}
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(authStateListener);
}
private void startSign() {
String email = mEmail.getText().toString();
String password = mPassword.getText().toString();
if (TextUtils.isEmpty(email) || TextUtils.isEmpty(password)) {
Toast.makeText(MainActivity.this, "Fields are empty", Toast.LENGTH_SHORT).show();
} else {
mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (!task.isSuccessful()) {
Toast.makeText(MainActivity.this, "Login Problem", Toast.LENGTH_SHORT).show();
}
}
});
}
}
}

尽管我在主活动文件中初始化了FirebaseApp.initializeApp(this);，但我还是收到了错误

确保首先调用FirebaseApp.initializeApp(Context(

当我在谷歌上搜索它时，在这里确保在Android 中首先调用FirebaseApp.initializeApp(Context(

我找到了一些指令，但我不能做的是，把apply plugin: 'com.google.gms.google-services'放在我的gradle文件的末尾，因为每当我这样做时，我都会得到另一个错误

Gradle错误：任务"：app:processDebugGoogleServices"执行失败

当我在谷歌上搜索时，我在这里找到了Gradle错误：任务'；的执行失败：app:processDebugGoogleServices'；这是不必要的，因为"com.android.application"包已经有了相同的包。现在我不知道该怎么办，也不知道该如何修复。

更新：这是我的构建。gradle(项目(：

buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.1.3'
classpath 'com.google.gms:google-services:4.0.2'

// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

Answer 1

您需要添加：

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

在文件末尾可以使用firebase库。

在顶级gradle文件中添加最新版本的谷歌服务插件：

dependencies {
classpath 'com.google.gms:google-services:4.0.2'
// ...
}

这样你就不会得到以下错误：

错误：任务"：app:processDebugGoogleServices"的执行失败。

请修复版本冲突。

还要检查这个：

https://developers.google.com/android/guides/google-services-plugin