Google使用firebase在模拟器上工作但不在真实设备上登录？

Question

登录在模拟器中完美运行，但它总是在我真正的Android手机上失败 task.isSuccessful()总是在我的真实设备中返回错误结果，但在使用模拟器时没有问题。

package com.inc.mountzoft.goldencompass;

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.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.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 = "firebaseAuthentication";

//creating a GoogleSignInClient object
GoogleSignInClient mGoogleSignInClient;

//And also a Firebase Auth object
FirebaseAuth mAuth;
GoogleSignInAccount account;

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

    //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
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
            account = task.getResult(ApiException.class);

            //authenticating with firebase
            firebaseAuthWithGoogle(account);
            Toast.makeText(LoginActivity.this, "Signing In...Please Wait !", Toast.LENGTH_LONG).show();
        } catch (ApiException e) {
            Toast.makeText(LoginActivity.this, "Try again !", 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()) {

// task.isSuccessful（）总是在我的真实设备中返回一个错误的结果，但在使用模拟器时没问题。

                        Log.d(TAG, "signInWithCredential:success");
                        FirebaseUser user = mAuth.getCurrentUser();

                        Toast.makeText(LoginActivity.this, "Welcome, you are signed as "+account.getDisplayName(), Toast.LENGTH_LONG).show();
                        Intent intent = new Intent(LoginActivity.this, MapsActivity.class);
                        startActivity(intent);
                    } 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);
  }
}