android firebase认证谷歌登录

本文概述

Firebase身份验证提供了易于使用的SDK和内置UI库的后端服务,以在应用程序中对用户进行身份验证。大多数应用程序需要用户的身份,并且在知道其状态后,该应用程序会将用户的数据安全地保存在云中。它旨在建立一个安全的身份验证系统。

使用Firebase身份验证,我们将对Google,Facebook,GitHub,Twitter等的登录进行身份验证。

在本教程中,我们将使用Google和Firebase API将用于Google登录功能的Firebase身份验证集成到我们的Android应用程序中。

在Google Firebase帐户上创建和配置Android应用的步骤

1.通过https://firebase.google.com/创建一个Firebase开发人员帐户,然后单击“转到控制台”。

2.单击“添加项目”。

3.填写项目名称,然后选择分析位置,Cloud Firestore位置,接受控制器条款并单击“创建项目”。

4.新项目成功准备就绪后,单击“继续”。

5.选择“ Android”平台SDK。

6.通过提供所需的应用程序信息将你的应用程序注册到Firebase,然后单击“注册应用程序”。

我们可以通过以下步骤获取应用程序证书SHA-1密钥:

  1. 打开Android项目。
  2. 从右侧面板打开“ Gradle”选项卡。
  3. 双击“ signingReport”。
  4. 我们将在“ Gradle Console”上找到我们的应用SHA-1键。

7.现在下载“ google-services.json”文件,将其集成到Android应用程序中,然后单击“下一步”。

8.在应用程序的.gradle文件中添加firebase SDK依赖项,然后在IDE中单击“立即同步”,然后单击“下一步”。

build.gradle(项目)

dependencies {
    classpath 'com.android.tools.build:gradle:3.0.1'
    classpath 'com.google.gms:google-services:4.0.1'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}

build.gradle(模块)

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    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-auth:16.0.3'
    implementation 'com.google.firebase:firebase-core:16.0.3'
    implementation 'com.google.android.gms:play-services-auth:16.0.0'
    implementation 'com.github.bumptech.glide:glide:3.7.0'
}
apply plugin: 'com.google.gms.google-services'

AndroidManifest.xml

在AndroidManifest.xml文件中添加Internet权限以访问网络连接。

<uses-permission android:name="android.permission.INTERNET" />

9.运行你的应用以验证安装配置,如果一切正常,它将显示一条成功消息,然后单击“继续至控制台”。

10.在控制台页面上,选择Authentication -gt;登录方法-gt; Google -gt;启用并单击“保存”。

带有Google登录示例的Android Firebase身份验证

在此示例中,我们将在我们的Android应用中将Firebase身份验证与Google登录进行集成。用户成功通过Google登录成功登录后,我们将使用Firebase身份验证对其进行身份验证,然后将用户重定向到下一个活动(ProfileActivity)并显示其详细信息。

我们需要将下载的“ google-services.json”文件粘贴到我们的Android项目应用目录中。

activity_main.xml

在activity_main.xml文件中添加以下代码。在此活动中,我们实现自定义Google登录按钮。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="example.srcmini02.com.firebasegooglelogin.MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:textSize="20dp"
        android:text="This is main activity, sign in to move next activity." />

    <com.google.android.gms.common.SignInButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/sign_in_button"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="20dp">

    </com.google.android.gms.common.SignInButton>


</RelativeLayout>

strings.xml

在string.xml文件中添加你的Web客户端ID。即使你可以在程序中使用默认的Google Web客户端ID。

<resources>
    <string name="app_name">Firebase Google Login</string>
    <string name="web_client_id">xxxxxxxx..place your web client id here</string>
</resources>

MainActivity.java

在MainActivity.java类中添加以下代码。 MainActivity.java类中使用的类和方法的功能如下:

  1. 新的FirebaseAuth.AuthStateListener(){}用作身份验证侦听器,以检查用户是否登录。如果用户成功登录,我们将放置其他firebase逻辑。
  2. 新的GoogleSignInOptions.Builder()方法将Google登录配置为使用requestEmail选项获取用户数据。
  3. 单击“登录”按钮,它将调用Auth.GoogleSignInApi.getSignInIntent(googleApiClient),并使用startActivityForResult()启动该意图。
  4. onActivityResult()我们获取Google登录请求的结果。
  5. 如果handleSignInResult(result)返回true,则使用idToken获得Google身份验证。
  6. 调用firebaseAuthWithGoogle(credential)进行Google的Firebase身份验证。

如果Firebase身份验证成功,则将用户重定向到下一个活动(ProfileActivity.java)。

package example.srcmini02.com.firebasegooglelogin;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;

public class MainActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener {

    private static final String TAG = "MainActivity";
    private SignInButton signInButton;
    private GoogleApiClient googleApiClient;
    private static final int RC_SIGN_IN = 1;
    String name, email;
    String idToken;
    private FirebaseAuth firebaseAuth;
    private FirebaseAuth.AuthStateListener authStateListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        firebaseAuth = com.google.firebase.auth.FirebaseAuth.getInstance();
        //this is where we start the Auth state Listener to listen for whether the user is signed in or not
        authStateListener = new FirebaseAuth.AuthStateListener(){
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                // Get signedIn user
                FirebaseUser user = firebaseAuth.getCurrentUser();

                //if user is signed in, we call a helper method to save the user details to Firebase
                if (user != null) {
                    // User is signed in
                    // you could place other firebase code
                    //logic to save the user details to Firebase
                    Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
                } else {
                    // User is signed out
                    Log.d(TAG, "onAuthStateChanged:signed_out");
                }
            }
        };

        GoogleSignInOptions gso =  new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.web_client_id))//you can also use R.string.default_web_client_id
                .requestEmail()
                .build();
        googleApiClient=new GoogleApiClient.Builder(this)
                .enableAutoManage(this, this)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

        signInButton = findViewById(R.id.sign_in_button);
        signInButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = Auth.GoogleSignInApi.getSignInIntent(googleApiClient);
                startActivityForResult(intent, RC_SIGN_IN);
            }
        });
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode==RC_SIGN_IN){
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            handleSignInResult(result);
        }
    }

    private void handleSignInResult(GoogleSignInResult result){
        if(result.isSuccess()){
            GoogleSignInAccount account = result.getSignInAccount();
            idToken = account.getIdToken();
            name = account.getDisplayName();
            email = account.getEmail();
            // you can store user data to SharedPreference
            AuthCredential credential = GoogleAuthProvider.getCredential(idToken, null);
            firebaseAuthWithGoogle(credential); 
        }else{
            // Google Sign In failed, update UI appropriately
            Log.e(TAG, "Login Unsuccessful. "+result);
            Toast.makeText(this, "Login Unsuccessful", Toast.LENGTH_SHORT).show();
        }
    }
    private void firebaseAuthWithGoogle(AuthCredential credential){

        firebaseAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());
                        if(task.isSuccessful()){
                            Toast.makeText(MainActivity.this, "Login successful", Toast.LENGTH_SHORT).show();
                            gotoProfile();
                        }else{
                            Log.w(TAG, "signInWithCredential" + task.getException().getMessage());
                            task.getException().printStackTrace();
                            Toast.makeText(MainActivity.this, "Authentication failed.", Toast.LENGTH_SHORT).show();
                        }

                    }
                });
    }




    private void gotoProfile(){
        Intent intent = new Intent(MainActivity.this, ProfileActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        startActivity(intent);
        finish();
    }
    @Override
    protected void onStart() {
        super.onStart();
        if (authStateListener != null){
            FirebaseAuth.getInstance().signOut();
        }
        firebaseAuth.addAuthStateListener(authStateListener);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (authStateListener != null){
            firebaseAuth.removeAuthStateListener(authStateListener);
        }
    }

}

profile_activity.xml

在profile_activity.xml文件中添加以下代码。 ImageView用于显示用户个人资料图像,TextView用于名称,电子邮件,ID和用于注销的按钮。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="example.srcmini02.com.firebasegooglelogin.ProfileActivity">


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical">
            <ImageView
                android:layout_width="80dp"
                android:layout_height="80dp"
                android:id="@+id/profileImage"
                />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/name"
                android:text="name"
                android:textSize="20dp"
                android:layout_marginTop="20dp"/>
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/email"
                android:textSize="20dp"
                android:text="email"
                android:layout_marginTop="20dp"/>
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/userId"
                android:textSize="20dp"
                android:text="id"
                android:layout_marginTop="20dp"/>
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/logoutBtn"
                android:text="Logout"
                android:layout_marginTop="30dp"/>
        </LinearLayout>
</RelativeLayout>

ProfileActivity.java

在这个ProfileActivity.java类中,我们获取用户信息并显示它们。 GoogleSignInResult类实现了Result接口,该接口表示调用Google Play服务的API方法的最终结果。

GoogleSignInAccount类保留用户的必要信息。

package example.srcmini02.com.firebasegooglelogin;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.OptionalPendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.firebase.auth.FirebaseAuth;

public class ProfileActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener {
    Button logoutBtn;
    TextView userName, userEmail, userId;
    ImageView profileImage;
    private GoogleApiClient googleApiClient;
    private GoogleSignInOptions gso;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile);

        logoutBtn = findViewById(R.id.logoutBtn);
        userName = findViewById(R.id.name);
        userEmail = findViewById(R.id.email);
        userId = findViewById(R.id.userId);
        profileImage = findViewById(R.id.profileImage);

        gso =  new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();

        googleApiClient=new GoogleApiClient.Builder(this)
                .enableAutoManage(this, this)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();


        logoutBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FirebaseAuth.getInstance().signOut();
                Auth.GoogleSignInApi.signOut(googleApiClient).setResultCallback(
                        new ResultCallback<Status>() {
                            @Override
                            public void onResult(Status status) {
                                if (status.isSuccess()){
                                    gotoMainActivity();
                                }else{
                                    Toast.makeText(getApplicationContext(), "Session not close", Toast.LENGTH_LONG).show();
                                }
                            }
                        });
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        OptionalPendingResult<GoogleSignInResult> opr= Auth.GoogleSignInApi.silentSignIn(googleApiClient);
        if(opr.isDone()){
            GoogleSignInResult result=opr.get();
            handleSignInResult(result);
        }else{
            opr.setResultCallback(new ResultCallback<GoogleSignInResult>() {
                @Override
                public void onResult(@NonNull GoogleSignInResult googleSignInResult) {
                    handleSignInResult(googleSignInResult);
                }
            });
        }
    }
    private void handleSignInResult(GoogleSignInResult result){
        if(result.isSuccess()){
            GoogleSignInAccount account=result.getSignInAccount();
            userName.setText(account.getDisplayName());
            userEmail.setText(account.getEmail());
            userId.setText(account.getId());
            try{
                Glide.with(this).load(account.getPhotoUrl()).into(profileImage);
            }catch (NullPointerException e){
                Toast.makeText(getApplicationContext(), "image not found", Toast.LENGTH_LONG).show();
            }

        }else{
            gotoMainActivity();
        }
    }
    private void gotoMainActivity(){
        Intent intent=new Intent(this, MainActivity.class);
        startActivity(intent);
    }
    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }
}

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