Android-接入谷歌登录

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1.登录分类

授权登录 和 一键登录
一键登录在部分设备会登录不了报白名单错误国外的大多数应用使用的是授权登录建议使用授权登录

2.申请key

在FireBase中直接创建Android 项目会在Google Cloud 直接生成相关的key不需要在GoogleCloud手动创建。
会生成一个Android 和一个 Web 的配置需要使用 Web 的 Key。

3.授权登录

class LoginActivity : BaseActivity() {
    companion object {
        private const val SIGN_LOGIN = 901

        /**
         * google自动登录使用的是Web的key。web项目会在Android项目生成的时候自动生成
         */
        private const val SERVER_CLIENT_ID = "xxx"
    }
    
    private lateinit var auth: FirebaseAuth
    private var mGoogleSignInClient: GoogleSignInClient? = null

    private fun signInClient() {
        if (mGoogleSignInClient == null) {
            val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .requestIdToken(SERVER_CLIENT_ID)
                .build();
            mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
        }
    }


    private fun getGoogleIntent(): Intent {
        var signInInten: Intent
        if (mGoogleSignInClient == null) {
            signInClient();
        }
        signInInten = mGoogleSignInClient!!.signInIntent;
        return signInInten
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        ...
        auth = FirebaseAuth.getInstance()
        btnLoginGoogle.setOnClickListener {
                signInClient()
                startActivityForResult(getGoogleIntent(), SIGN_LOGIN)
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        when (requestCode) {
            SIGN_LOGIN -> {
                val task = GoogleSignIn.getSignedInAccountFromIntent(data);
                if (task == null) {
                    Log.d("tag", "tasknull")
                }
                try {
                    val account = task.getResult(ApiException::class.java)
                    Log.d("tag", "id:" + account.idToken)
                    val firebaseCredential = GoogleAuthProvider.getCredential(account.idToken, null)
                    auth.signInWithCredential(firebaseCredential)
                        .addOnCompleteListener(this@LoginActivity) { task ->
                            if (task.isSuccessful) {
                                // Sign in success, update UI with the signed-in user's information
                                Log.d("tag", "signInWithCredential:success")
                                val user = auth.currentUser
                                user?.getIdToken(true)
                                    ?.addOnCompleteListener(OnCompleteListener<GetTokenResult?> { task ->
                                        if (task.isSuccessful) {
                                            val idToken: String? = task.result.token
                                           // 和后台交互进行登录
                                        } else {
                                            // Handle error -> task.getException();
                                        }
                                    })
                            } else {
                                // If sign in fails, display a message to the user.
                                Log.w("tag", "signInWithCredential:failure", task.exception)
                            }
                        }
                } catch (e: ApiException) {
                    Log.d("tag", "task" + e.localizedMessage)
                }
            }
        }
    }
}

4.一键登录

    private val REQ_ONE_TAP = 2  // Can be any integer unique to the Activity
    private lateinit var oneTapClient: SignInClient
    private lateinit var signInRequest: BeginSignInRequest


        oneTapClient = Identity.getSignInClient(this)
        signInRequest = BeginSignInRequest.builder()
            .setPasswordRequestOptions(BeginSignInRequest.PasswordRequestOptions.builder().setSupported(true).build())
            .setGoogleIdTokenRequestOptions(
                BeginSignInRequest.GoogleIdTokenRequestOptions.builder()
                    .setSupported(true)
                    .setServerClientId(ServerClientId)
                    .setFilterByAuthorizedAccounts(false)
                    .build()
            ).setAutoSelectEnabled(true).build()

//https://developers.google.com/identity/one-tap/android/get-saved-credentials
                oneTapClient.beginSignIn(signInRequest)
                    .addOnSuccessListener(this@LoginActivity) { result ->
                        try {
                            startIntentSenderForResult(
                                result.pendingIntent.intentSender, REQ_ONE_TAP,
                                null, 0, 0, 0, null
                            )
                        } catch (e: IntentSender.SendIntentException) {
                            Log.e("tag", "Couldn't start One Tap UI: ${e.localizedMessage}")
                        }
                    }
                    .addOnFailureListener(this@LoginActivity) { e ->
                        // No saved credentials found. Launch the One Tap sign-up flow, or
                        // do nothing and continue presenting the signed-out UI.
                        Log.d("tag", e.localizedMessage)
                     
                    }

onActivityResult

REQ_ONE_TAP -> {
                try {
                    val credential = oneTapClient.getSignInCredentialFromIntent(data)
                    val idToken = credential.googleIdToken
                    val username = credential.id
                    val password = credential.password
                    when {
                        idToken != null -> {
                            // Got an ID token from Google. Use it to authenticate
                            // with your backend.
                            Log.d("tag", "Got ID token:" + idToken)
                            val firebaseCredential = GoogleAuthProvider.getCredential(idToken, null)
                            auth.signInWithCredential(firebaseCredential)
                                .addOnCompleteListener(this@LoginActivity) { task ->
                                    if (task.isSuccessful) {
                                        // Sign in success, update UI with the signed-in user's information
                                        Log.d("tag", "signInWithCredential:success")
                                        val user = auth.currentUser
                                        user?.getIdToken(true)
                                            ?.addOnCompleteListener(OnCompleteListener<GetTokenResult?> { task ->
                                                if (task.isSuccessful) {
                                                    val idToken: String? = task.result.token
                                                    Log.d("tag", "uid: " + user.uid)
                                                    Log.d("tag", "IDToken: " + idToken)
                                                } else {
                                                    // Handle error -> task.getException();
                                                }
                                            })
                                    } else {
                                        // If sign in fails, display a message to the user.
                                        Log.w("tag", "signInWithCredential:failure", task.exception)
                                     
                                    }
                                }
                        }
                        password != null -> {
                            // Got a saved username and password. Use them to authenticate
                            // with your backend.
                            Log.d("tag", "Got password.")
                        }
                        else -> {
                            // Shouldn't happen.
                            Log.d("tag", "No ID token or password!")
                        }
                    }
                } catch (e: ApiException) {
                    // ...
                }
            }