[안드로이드 프로그래밍 7판] 예제 7-14~7-17 대화 상자 만들기

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="대화상자" />


</LinearLayout>

 

MainActivity.java

package com.example.myapplication;

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.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    Button btn1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn1 = (Button) findViewById(R.id.btn1);
        btn1.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this);
                dlg.setTitle("제목입니다.");
                dlg.setMessage("이곳이 내용입니다.");
                dlg.setIcon(R.mipmap.ic_launcher);
                dlg.setPositiveButton("확인", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "확인을 눌렀네요", Toast.LENGTH_SHORT).show();
                    }
                });
                dlg.show();
            }

        });


    }

}

 

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