AlertDialog (알림 대화상자) 예시

MainActivity.java

package com.example.mydialog;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.AlphabetIndexer;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.material.snackbar.Snackbar;

public class MainActivity extends AppCompatActivity {
    TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = findViewById(R.id.textView);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showMessage();
            }
        });

    }
    public void showMessage(){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("안내");
        builder.setMessage("종료하시겠습니다?");
        builder.setIcon(android.R.drawable.ic_dialog_alert);
        builder.setPositiveButton("예", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Snackbar.make(textView, "예 버튼이 눌렸습니다.",Snackbar.LENGTH_LONG).show();
            }
        });
        builder.setNegativeButton("아니오", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Snackbar.make(textView, "아니오 버튼이 눌렸습니다.",Snackbar.LENGTH_LONG).show();
            }
        });
        AlertDialog dialog = builder.create();
        dialog.show();
    }
}

 

: AlertDialog의 경우 Builder를 이용해서 만들어줌