안드로이드스튜디오 로그인 값 검사하기 ( 입력 이벤트 리스너 addTextChangedListener )

 

 

package com.example.myapplication;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.RelativeLayout;
 
public class MainActivity extends AppCompatActivity {
 
 
    EditText TextInputEditText_email;
    EditText TextInputEditText_password;
    RelativeLayout RelativeLayout_loginButton;
 
// 전역변수 선언 ( DB가 없기때문에 변수를 통해 입력값과 비교할 것이다
    String emailOk = "eh1021@gmail.com";
    String passwordOk = "1234";
    String input_email=null, input_password=null;
 
// 변수와 입력값 비교 함수
    public boolean validation(){
        return input_email.equals(emailOk) && input_password.equals(passwordOk);
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
 
        TextInputEditText_email = findViewById(R.id.TextInputEditText_email);
        TextInputEditText_password =  findViewById(R.id.TextInputEditText_password);
        RelativeLayout_loginButton = findViewById(R.id.RelativeLayout_LoginButton);
 
 
// 로그인 버튼 비활성화
        RelativeLayout_loginButton.setEnabled(false);
 
// addTextChangesListener EditText요소에서 사용자의 입력을 감지하는 메서드 ( 입력 전, 동안, 후 3가지 내부 메서드 존재)
        TextInputEditText_email.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
 
            }
 
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
 Log.d("Texting on email part", s + " / " + count + " " + start + " , " + before );
 // 로그를 확인하여 어떤 작동이 이루어지는 지 확인할 수 있음
 
                String email = TextInputEditText_email.getText().toString();
                String password = TextInputEditText_password.getText().toString();
                input_email = email;
                input_password = password;
 
// 입력된 값이 NULL이 아닐 때 입력값과 정해준 변수값이 같을 때 LOGIN버튼을 활성화한다
 
                if( input_email != null && input_password != null ) {
                    if (input_email.equals(emailOk) && input_password.equals(passwordOk)) {
 
                        RelativeLayout_loginButton.setEnabled(true);
                    }
                }
            }
 
            @Override
            public void afterTextChanged(Editable s) {
 
            }
        });
 
 
        TextInputEditText_password.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
 
            }
 
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
 Log.d("Texting on email part", s + " / " + count + " " + start + " , " + before );
                String email = TextInputEditText_email.getText().toString();
                String password = TextInputEditText_password.getText().toString();
                input_email = email;
                input_password = password;
 
                if( input_email != null && input_password != null ) {
                    if (input_email.equals(emailOk) && input_password.equals(passwordOk)) {
 
                        RelativeLayout_loginButton.setEnabled(true);
                    }
                }
            }
 
 
            @Override
            public void afterTextChanged(Editable s) {
 
            }
        });
 
 
        RelativeLayout_loginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
 
                String email = TextInputEditText_email.getText().toString();
                String password = TextInputEditText_password.getText().toString();
 
                Intent intent = new Intent(getBaseContext(),LoginResultActivity.class);
                intent.putExtra("email",email);
                intent.putExtra("password",password);
 
                startActivity(intent);
 
            }
        });
 
 
 
    }
 
 
}

 

 

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