GoogleSignInAccount getIdToken()为空

Question

嘿，我正在使用Firebase auth，并启用了Google登录功能。谷歌登录运行良好，我得到了所有的信息。但是，当我想在Firebase用户列表中保存用户时，getIdToken()是空的：

private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {       

    //here the acct.getIdToken() is null

    AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
    firebaseAuth.signInWithCredential(credential)
      .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
          @Override
          public void onComplete(@NonNull Task<AuthResult> task) {
              if (!task.isSuccessful()) {
                  Toast.makeText(SignIn.this, "Authentication failed.", Toast.LENGTH_SHORT).show();
              }

              // [START_EXCLUDE]
              progressDialog.hide();
              // [END_EXCLUDE]
          }
      });

}

Answer 1

也许您忘记了requestIdToken()对您的GoogleSignInOptions对象

试一试：

GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

Answer 2

您的Google OAuth客户端凭据应该是用于网络应用程序，而不是Android。而且您的Google登录选项应该类似于下面的代码(它是C#，但非常接近Java源代码)：

var gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DefaultSignIn)
            .RequestIdToken("OAuth Client Id goes here")
            .Build(); 

那就行了。

Answer 3

您需要在活动中重写onActivityResult方法。添加以下代码：

if (requestCode == RC_SIGN_IN) {
        GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
        if (result.isSuccess()) {
            GoogleSignInAccount account = result.getSignInAccount();
            firebaseAuthWithGoogle(account);
        }
    }

您的handleSignInResult方法应该是这样的：

private void handleSignInResult(GoogleSignInResult result) {
    if (result.isSuccess()) {
        GoogleSignInAccount googleSignInAccount = result.getSignInAccount();
        if (googleSignInAccount != null) {
            String userId = googleSignInAccount.getId();
        }
        updateUI(true);
    } else {
        updateUI(false);
    }
}

您还需要在您的Firebase帐户中启用Authentication -> SIGN-IN METHOD -> the provider。您需要启用正在使用的Email/Password、Google等。

您还需要将compile 'com.google.firebase:firebase-auth:10.2.0'放在build.gradle文件中。

在您的AndroidManifest中，必须设置以下两个权限：<uses-permission android:name="android.permission.INTERNET"/>' and '<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

您还需要设置您的SHA1。这里 --你可以看看怎么做。最后，不要忘记将你的google-services.json再次放在正确的位置。

firebaseAuthWithGoogle方法应该是这样的：

private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
    System.out.println("firebaseAuthWithGoogle:" + acct.getId());

    AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
    auth.signInWithCredential(credential)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    System.out.println("signInWithCredential:onComplete:" + task.isSuccessful());

                    if (!task.isSuccessful()) {
                        System.out.println("signInWithCredential" + task.getException());
                        Toast.makeText(MainActivity.this, "Authentication failed.",Toast.LENGTH_SHORT).show();
                    }
                }
            });
}

非常重要的是，不要忘记在onStart方法中添加以下代码：

@Override
public void onStart() {
    super.onStart();

    OptionalPendingResult<GoogleSignInResult> optionalPendingResult = Auth.GoogleSignInApi.silentSignIn(googleApiClient);
    if (optionalPendingResult.isDone()) {
        GoogleSignInResult googleSignInResult = optionalPendingResult.get();
        handleSignInResult(googleSignInResult);
    } else {
        optionalPendingResult.setResultCallback(new ResultCallback<GoogleSignInResult>() {
            @Override
            public void onResult(@NonNull GoogleSignInResult googleSignInResult) {
                handleSignInResult(googleSignInResult);
            }
        });
    }
    auth.addAuthStateListener(authListener);
}

希望能帮上忙！