Question

我目前正在尝试使用Firebases系统为我的应用程序创建登录功能。由于某种原因，行mGoogleSignInClient = GoogleSignIn.getClient(this, gso);无法正常工作。 GoogleSignIn.getClient为红色。我看了各种教程，但似乎都没有这个问题。很想得到这个问题的帮助。

编辑：链接到我的分数 https://gist.github.com/kakashidota/198e5253e168243e985be64fc93f1c9b https://gist.github.com/kakashidota/0a96ee860aff79dd70df67636d2b081f

package se.iths.apostolidis.quickmaths;


import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import android.widget.Toast;
import com.google.android.gms.common.api.ApiException;
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 LoginActivity extends AppCompatActivity {

    //a constant for detecting the login intent result
    private static final int RC_SIGN_IN = 234;

    //Tag for the logs optional
    private static final String TAG = "simplifiedcoding";

    //creating a GoogleSignInClient object
    GoogleSignInAccount mGoogleSignInClient;

    //And also a Firebase Auth object
    FirebaseAuth mAuth;

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

        //first we intialized the FirebaseAuth object
        mAuth = FirebaseAuth.getInstance();

        //Then we need a GoogleSignInOptions object
        //And we need to build it as below
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        //Then we will get the GoogleSignInClient object from GoogleSignIn class
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

        //Now we will attach a click listener to the sign_in_button
        //and inside onClick() method we are calling the signIn() method that will open
        //google sign in intent
        findViewById(R.id.sign_in_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                signIn();
            }
        });
    }

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

        //if the user is already signed in
        //we will close this activity
        //and take the user to profile activity
        if (mAuth.getCurrentUser() != null) {
            finish();
            startActivity(new Intent(this, ProfileActivity.class));
        }
    }


    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        //if the requestCode is the Google Sign In code that we defined at starting
        if (requestCode == RC_SIGN_IN) {

            //Getting the GoogleSignIn Task
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            try {
                //Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = task.getResult(ApiException.class);

                //authenticating with firebase
                firebaseAuthWithGoogle(account);
            } catch (ApiException e) {
                Toast.makeText(LoginActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
            }
        }
    }

    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d(TAG, "firebaseAuthWithGoogle:" + acct.getId());

        //getting the auth credential
        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);

        //Now using firebase we are signing in the user here
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            Log.d(TAG, "signInWithCredential:success");
                            FirebaseUser user = mAuth.getCurrentUser();

                            Toast.makeText(LoginActivity.this, "User Signed In", Toast.LENGTH_SHORT).show();
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            Toast.makeText(LoginActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();

                        }

                        // ...
                    }
                });
    }


    //this method is called on click
    private void signIn() {
        //getting the google signin intent
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();

        //starting the activity for result
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }
}

Answer 1

你这里做错了什么。 //创建GoogleSignInClient对象＆gt; GoogleSignInAccount mGoogleSignInClient; 您需要更改为Account to GoogleSigninClient，然后只有在获取客户端时才能获得此返回类型的客户端实例。 //然后我们将从GoogleSignIn类中获取GoogleSignInClient对象 mGoogleSignInClient = GoogleSignIn.getClient（this，gso）;

GoogleSignInAccount - ＆GT;更改为GoogleSignInClient

在Android应用上使用Firebase登录的问题

1 个答案: