java - 谷歌 Firebase 身份验证 Android Studio

Question

我正在尝试在我的应用中配置新的 google firebase 身份验证。

在按钮的 OnClickListener 中运行以下命令时，我收到 cannot resolve 'addOnCOmpleteListener'。

如果我将 firebase 调用从按钮 onClickListener 中移出，则会出现错误，

我不太明白为什么不能从按钮调用中访问该方法

任何帮助将不胜感激

package com.example.alex.test;

import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.net.Uri;
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.Button;
import android.widget.EditText;
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;
import com.google.firebase.auth.FirebaseUser;


public class LoginActivity extends AppCompatActivity {
    private FirebaseAuth mAuth;

    private FirebaseAuth.AuthStateListener mAuthListener;

    Button buttonLogin;
    EditText textEmail;
    EditText textPassword;


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

        mAuth = FirebaseAuth.getInstance();

        buttonLogin = (Button) findViewById(R.id.buttonLogin);
        textEmail = (EditText) findViewById(R.id.editEmail);
        textPassword = (EditText) findViewById(R.id.editPassword);

        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    // User is signed in
                    Log.d("LOG_Login", "onAuthStateChanged:signed_in:" + user.getUid());
                } else {
                    // User is signed out
                    Log.d("LOG_Login", "onAuthStateChanged:signed_out");
                }
                // ...
            }
        };




        buttonLogin.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on clic

                mAuth.signInWithEmailAndPassword(textEmail.getText().toString(),textPassword.getText().toString())
                        .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {
                                Log.d("LOG_Login", "signInWithEmail:onComplete:" + task.isSuccessful());

                                // 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()) {
                                    Log.w("LOG_Login", "signInWithEmail", task.getException());
                                    Toast.makeText(getApplicationContext(), "Authentication failed.", Toast.LENGTH_SHORT).show();
                                }

                                // ...
                            }
                        });
            }
        });

    }
}

我正在使用 Android Studio 2.2

我在 Firebase 中创建了一个项目

我已在 GUI 中将我的应用程序连接到此

Answer 1

If i move the firebase call out of the buttons onClickListener then the error goes,

I cant quite understand why the method is not accessible from within the button call

因为 this 是匿名类中的点击监听器。

该方法需要一个 Activity 作为 addOnCompleteListener 的第一个参数，而不是 OnClickListener。

.addOnCompleteListener(LoginActivity.this, ...