모르니까 검색할거야

package grocery.gohool.loginnregister;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

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

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
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.GoogleAuthProvider;

import org.json.JSONException;
import org.json.JSONObject;

public class LoginActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener {

    private EditText login_id, login_password;
    private Button login_btn, login_registerBtn;
    //구글 로그인
    private SignInButton google_btn; //로그인 버튼
    private FirebaseAuth firebaseAuth; //파이어베이스 인증관련 객체
    private GoogleApiClient googleApiClient; // 구글 API클라이언트 객체
    private final static int REQ_CODE = 100; // 구글 로그인 결과코드 : 값 반환 받기 위해.

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

        login_id = (EditText) findViewById(R.id.login_id);
        login_password = (EditText) findViewById(R.id.login_password);
        login_btn = (Button) findViewById(R.id.login_btn);
        login_registerBtn = (Button) findViewById(R.id.login_registerBtn);

        //로그인 페이지 => 회원가입페이지
        login_registerBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivity(intent);
            }
        });

        //로그인 요청에대한 응답;
        login_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userID = login_id.getText().toString();
                String userPassword = login_password.getText().toString();

                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            boolean success = jsonObject.getBoolean("success");
                            if(success){
                                String userID = jsonObject.getString("userID");
                                String userPassword = jsonObject.getString("userPassword");
                                Toast.makeText(getApplicationContext(), "로그인성공!", Toast.LENGTH_SHORT).show();
                                Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                                intent.putExtra("userID",userID);
                                intent.putExtra("userPASS", userPassword); startActivity(intent);

                            } else {
                                Toast.makeText(getApplicationContext(), "로그인실패ㅠㅠ", Toast.LENGTH_SHORT).show();
                                return;
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }
                };
                LoginRequest loginRequest = new LoginRequest(userID,userPassword,responseListener);
                RequestQueue queue = Volley.newRequestQueue(LoginActivity.this);
                queue.add(loginRequest);
            }
        });

        //구글 로그인
        GoogleSignInOptions googleSignInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        googleApiClient = new GoogleApiClient.Builder(this) //fragement라면 getApplicationContext로
                .enableAutoManage(this,this)
                .addApi(Auth.GOOGLE_SIGN_IN_API,googleSignInOptions)
                .build();

        firebaseAuth = FirebaseAuth.getInstance();

        google_btn = findViewById(R.id.google_btn);
        google_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = Auth.GoogleSignInApi.getSignInIntent(googleApiClient);
                startActivityForResult(intent,REQ_CODE); //인증받고 다시 돌아옴
            }
        });

    }

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

        if(requestCode == REQ_CODE){
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            if(result.isSuccess()){
                GoogleSignInAccount account = result.getSignInAccount();
                resultLogin(account);
            }
        }

    }

    private void resultLogin(GoogleSignInAccount account){
        AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(),null);
        firebaseAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if(task.isSuccessful()){
                            Toast.makeText(LoginActivity.this, "로그인성공", Toast.LENGTH_SHORT).show();
                            Intent intent = new Intent(getApplicationContext(),MainActivity.class);
                            intent.putExtra("email",account.getEmail());
                            intent.putExtra("name",account.getDisplayName());
                            startActivity(intent);

                        } else {
                            Toast.makeText(LoginActivity.this, "로그인실패", Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }


    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }

}

package grocery.gohool.loginnregister;

import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private TextView id,password;

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

        id = (TextView) findViewById(R.id.id);
        password = (TextView) findViewById(R.id.password);
        Intent intent = getIntent();
        String userId = intent.getStringExtra("userID");
        String userPass = intent.getStringExtra("userPass");
        id.setText(userId);
        password.setText(userPass);

        String email = intent.getStringExtra("email");
        String name = intent.getStringExtra("name");

        id.setText(email);
        password.setText(name);


    }
}

기존에 만들어두었던 로그인 회원가입 기능에 구글 연동만 추가해 주었다.

잘 된다.

아이디와 비밀번호 대신, 이메일과 닉네임만 가져왔다.

여기서 변경하고 싶으면 textView를 invisible로해서 변경하면 된다.

그럼 각각 값을 가져오니, 불편함없이 볼 수 있다.