Google身份验证卡在同一活动上

Question

我一直在使用google身份验证方法来获取用户身份验证，但是当我单击Google登录按钮时，它向我显示了要选择的Google电子邮件ID，但单击该按钮则无法进行其他活动。因此，从何处获取该特定令牌以进行验证或如何解决此问题。我有两个活动LoginActivity和HomeActivity，这是在LoginActivity上执行的，我想使用HomeActivity。

package com.example.firebasedemo;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;


import android.content.Intent;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.SignInButton;
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 {
    EditText emailId, password;
    Button btnSignIn;
    TextView tvSignUp;
    FirebaseAuth mFirebaseAuth;
    private FirebaseAuth.AuthStateListener mAuthStateListener;
    GoogleSignInClient mGoogleSignInClient;
    SignInButton signInButton;

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


        mFirebaseAuth = FirebaseAuth.getInstance();
        emailId = findViewById(R.id.username1);
        password = findViewById(R.id.password1);
        btnSignIn = findViewById(R.id.btn_signin);
        tvSignUp = findViewById(R.id.txt);
        signInButton=(SignInButton)findViewById(R.id.googlebutton);

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

        signInButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent  signIn=mGoogleSignInClient.getSignInIntent();
                startActivityForResult(signIn,101);
                Toast.makeText(LoginActivity.this,"Logging",Toast.LENGTH_SHORT).show();


            }
        });


        mAuthStateListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser mFirebaseUser = mFirebaseAuth.getCurrentUser();
                if( mFirebaseUser != null ){
                    Toast.makeText(LoginActivity.this,"You are logged in",Toast.LENGTH_SHORT).show();
                    Intent i = new Intent(LoginActivity.this, HomeActivity.class);
                    startActivity(i);
                }
                else{
                    Toast.makeText(LoginActivity.this,"Please Login",Toast.LENGTH_SHORT).show();
                }
            }
        };
        mGoogleSignInClient= GoogleSignIn.getClient(this,gso);


        btnSignIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = emailId.getText().toString();
                String pwd = password.getText().toString();
                if(email.isEmpty()){
                    emailId.setError("Please enter email id");
                    emailId.requestFocus();
                }
                else  if(pwd.isEmpty()){
                    password.setError("Please enter your password");
                    password.requestFocus();
                }
                else  if(email.isEmpty() && pwd.isEmpty()){
                    Toast.makeText(LoginActivity.this,"Fields Are Empty!",Toast.LENGTH_SHORT).show();
                }
                else  if(!(email.isEmpty() && pwd.isEmpty())){
                    mFirebaseAuth.signInWithEmailAndPassword(email, pwd).addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {
                            if(!task.isSuccessful()){
                                Toast.makeText(LoginActivity.this,"Login Error, Please Login Again",Toast.LENGTH_SHORT).show();
                            }
                            else{
                                Intent intToHome = new Intent(LoginActivity.this,HomeActivity.class);
                                startActivity(intToHome);
                            }
                        }
                    });
                }
                else{
                    Toast.makeText(LoginActivity.this,"Error Occurred!",Toast.LENGTH_SHORT).show();

                }

            }
        });

        tvSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intSignUp = new Intent(LoginActivity.this, MainActivity.class);
                startActivity(intSignUp);
            }
        });

    }

    @Override
    protected void onStart() {
        super.onStart();
        mFirebaseAuth.addAuthStateListener(mAuthStateListener);
    }

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

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == 101) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            try {
                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = task.getResult(ApiException.class);
                firebaseAuthWithGoogle(account);

            } catch (ApiException e) {
                // Google Sign In failed, update UI appropriately
                // ...
            }
        }
    }

    private void firebaseAuthWithGoogle(GoogleSignInAccount acct)
    {
       AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mFirebaseAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            // Sign in success, update UI with the signed-in user's information
                            FirebaseUser user = mFirebaseAuth.getCurrentUser();
                          finish();
                            Intent intent=new Intent(getApplicationContext(),ProfileActivity.class);
                            startActivity(intent);
                            Toast.makeText(getApplicationContext(),"User logged in suceessfully",Toast.LENGTH_SHORT).show();
                        } else {
                            // If sign in fails, display a message to the user.
                    Toast.makeText(getApplicationContext(),"Error to login",Toast.LENGTH_SHORT).show();
                        }

                        // ...
                    }
                });

    }
}