안드로이드 // firebase - email 가입 및 로그인

 

처음오셨다면 아래링크를 먼저 확인하세요

https://ondolroom.tistory.com/741

안드로이드 // firebase로 구글로그인하기

 

아래 사이트를 먼저 확인

https://firebase.google.com/docs/auth/android/start?authuser=0

Android에서 Firebase 인증 시작하기

 

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AndroidManifest.xml

인터넷 권한 획득을 위해 아래코드 추가

<uses-permission android:name="android.permission.INTERNET"/>

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프로젝트 단위 build.gradle

'com.google.gms:google-services:4.3.3' 코드를 추가(3.0.0도 가능)

    dependencies {
        classpath "com.android.tools.build:gradle:4.0.0"
        classpath 'com.google.gms:google-services:4.3.3' // 추가

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }

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앱 단위 build.gradle

맨 바깥에 아래코드 추가

// firebase
apply plugin: 'com.google.gms.google-services'

dependencies 안에 아래코드 추가

    //firebase create account
    implementation 'com.google.firebase:firebase-auth:19.3.2'

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activity_main.xml

아래와 같이 뷰를 짜준다

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MainActivity

package com.jaybon.firebasecreateaccounttest;

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

import android.os.Bundle;
import android.text.TextUtils;
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.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 MainActivity extends AppCompatActivity {

    private static final String TAG = "Main_Activity";
    private MainActivity mContext = MainActivity.this;

    private FirebaseAuth mAuth;
    private TextView tv;
    private TextView tv1;
    private EditText email1;
    private EditText password1;
    private Button sign;
    private Button login;
    private Button logout;

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

        // Initialize Firebase Auth
        mAuth = FirebaseAuth.getInstance();

        tv = findViewById(R.id.tv);
        tv1 = findViewById(R.id.tv1);

        email1 = findViewById(R.id.email);
        password1 = findViewById(R.id.password);

        sign = findViewById(R.id.sign);
        sign.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                createAccount(email1.getText().toString(), password1.getText().toString());
            }
        });



        login = findViewById(R.id.login);
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                signIn(email1.getText().toString(), password1.getText().toString());
            }
        });


        logout = findViewById(R.id.logout);
        logout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                logout();
            }
        });
    }

    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
    }

    private void createAccount(String email, String password) {
        Log.d(TAG, "createAccount:" + email);
        if (!validateForm()) {
            return;
        }

        mAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                Log.d(TAG, "onComplete: 들어옴");
                if (task.isSuccessful()) {
                    // Sign in success, update UI with the signed-in user's information
                    Log.d(TAG, "createUserWithEmail:success");
                    FirebaseUser user = mAuth.getCurrentUser();
                    tv.setText(user.getEmail());
                    tv1.setText("회원가입됨");
                } else {
                    // If sign in fails, display a message to the user.
                    Log.w(TAG, "createUserWithEmail:failure", task.getException());
                    Toast.makeText(mContext, "Authentication failed.",
                            Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    private void signIn(String email, String password) {
        Log.d(TAG, "signIn:" + email);
        if (!validateForm()) {
            return;
        }

        mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                Log.d(TAG, "onComplete: 들어옴");
                if (task.isSuccessful()) {
                    // Sign in success, update UI with the signed-in user's information
                    Log.d(TAG, "signInWithEmail:success");
                    FirebaseUser user = mAuth.getCurrentUser();
                    tv.setText(user.getEmail());
                    tv1.setText("로그인됨");
                } else {
                    // If sign in fails, display a message to the user.
                    Log.w(TAG, "signInWithEmail:failure", task.getException());
                    Toast.makeText(mContext, "Authentication failed.",
                            Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    private void logout() {
        mAuth.signOut();
        Log.d(TAG, "signOut: 사인아웃!!!!!!!!!!!!!"+mAuth.getCurrentUser());
    }

    private boolean validateForm() {
        boolean valid = true;

        String email = email1.getText().toString();
        if (TextUtils.isEmpty(email)) {
            email1.setError("Required.");
            valid = false;
        } else {
            email1.setError(null);
        }

        String password = password1.getText().toString();
        if (TextUtils.isEmpty(password)) {
            password1.setError("Required.");
            valid = false;
        } else {
            password1.setError(null);
        }

        return valid;
    }
}

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입력한 이메일과 비번이 공백인지 확인

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회원가입을 진행하는 함수

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로그인을 진행하는 함수

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로그아웃을 하는 로직

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회원가입 테스트