Impossible de trouver le symbole: nouveau OnCompleteListener <AuthResult>()

Question

AuthResult est ROUGE. Aidez-moi, s'il vous plaît. Impossible d'importer aussi. Son dit ne peut pas trouver le symbole. Est-ce que leur problème? J'essaie beaucoup, mais rien ne trouve à le réparer.

En cliquant ALT + ENTRER il ne montre rien d'importation

LoginActivity.java

package com.rafiq.quickchat; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.content.Intent; 
import android.support.annotation.NonNull; 
import android.text.TextUtils; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ProgressBar; 
import android.widget.Toast; 

import com.google.android.gms.tasks.OnCompleteListener; 
import com.google.android.gms.tasks.Task; 
import com.google.firebase.auth.AuthResult; 
import com.google.firebase.auth.FirebaseAuth; 

public class SignupActivity extends AppCompatActivity { 

    private EditText inputEmail, inputPassword; 
    private Button btnSignIn, btnSignUp, btnResetPassword; 
    private ProgressBar progressBar; 
    private FirebaseAuth auth; 

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

     //Get Firebase auth instance 
     auth = FirebaseAuth.getInstance(); 

     btnSignIn = (Button) findViewById(R.id.sign_in_button); 
     btnSignUp = (Button) findViewById(R.id.sign_up_button); 
     inputEmail = (EditText) findViewById(R.id.email); 
     inputPassword = (EditText) findViewById(R.id.password); 
     progressBar = (ProgressBar) findViewById(R.id.progressBar); 
     btnResetPassword = (Button) findViewById(R.id.btn_reset_password); 

     btnResetPassword.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       startActivity(new Intent(SignupActivity.this, ResetPasswordActivity.class)); 
      } 
     }); 

     btnSignIn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       finish(); 
      } 
     }); 

     btnSignUp.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       String email = inputEmail.getText().toString().trim(); 
       String password = inputPassword.getText().toString().trim(); 

       if (TextUtils.isEmpty(email)) { 
        Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show(); 
        return; 
       } 

       if (TextUtils.isEmpty(password)) { 
        Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show(); 
        return; 
       } 

       if (password.length() < 6) { 
        Toast.makeText(getApplicationContext(), "Password too short, enter minimum 6 characters!", Toast.LENGTH_SHORT).show(); 
        return; 
       } 

       progressBar.setVisibility(View.VISIBLE); 
       //create user 
       auth.createUserWithEmailAndPassword(email, password) 
         .addOnCompleteListener(SignupActivity.this, new OnCompleteListener<AuthResult>() { 
          @Override 
          public void onComplete(@NonNull Task<AuthResult> task) { 
           Toast.makeText(SignupActivity.this, "createUserWithEmail:onComplete:" + task.isSuccessful(), Toast.LENGTH_SHORT).show(); 
           progressBar.setVisibility(View.GONE); 
           // If sign in fails, display a message to the user. If sign in succeeds 
           // the auth state listener will be notified and logic to handle the 
           // signed in user can be handled in the listener. 
           if (!task.isSuccessful()) { 
            Toast.makeText(SignupActivity.this, "Authentication failed." + task.getException(), 
              Toast.LENGTH_SHORT).show(); 
           } else { 
            startActivity(new Intent(SignupActivity.this, MainActivity.class)); 
            finish(); 
           } 
          } 
         }); 

      } 
     }); 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     progressBar.setVisibility(View.GONE); 
    } 
} 

Dépendance:

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', 
    { 
     exclude group: 'com.android.support', module: 'support-annotations' 
    }) 
    compile 'com.android.support:appcompat-v7:26.+' 
    testCompile 'junit:junit:4.12' 
    compile 'com.google.firebase:firebase-database:9.2.0' 
    compile 'com.google.firebase:firebase-auth:9.2.0' 
    compile 'com.google.firebase:firebase-storage:9.2.0' 
    compile 'com.google.firebase:firebase-messaging:9.6.0' 
    compile 'com.firebase:firebase-client-android:2`enter code here`.5.2+' 
    compile 'com.android.volley:volley:1.0.0' 
    compile 'com.android.support:design:26.1.0' 
} 
apply plugin: 'com.google.gms.google-services' 

Answer 1

Enfin, je résolus en changeant la version de la dépendance:

compile 'com.google.firebase:firebase-messaging:9.2.0'