[Android Studio] (Dialog 다이얼로그 팝업창)

화면에 팝업창 띄우고 싶을 때

 

activity_main.xml

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

    <Button
        android:id="@+id/btn_dialog"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="다이얼로그 "/>

    <TextView
        android:id="@+id/tv_result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="40sp"
        android:text="테스트"/>


</LinearLayout>

 

MainActivity.java

 

package com.example.dialogexample;

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

import android.annotation.SuppressLint;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    Button btn_dialog;
    TextView tv_result;

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

        btn_dialog = (Button) findViewById(R.id.btn_dialog);
        tv_result = (TextView) findViewById(R.id.tv_result);//id 찾아 주는 것임

        btn_dialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder ad = new AlertDialog.Builder(MainActivity.this);
                ad.setIcon(R.mipmap.ic_launcher); //dialog창에서 ImageView로 조그맣게 띄울 아이콘
                ad.setTitle("제목");
                ad.setMessage("홍드로이드는 존잘입니까?");

                final EditText et = new EditText(MainActivity.this);
                ad.setView(et);//dialog 안에 et라는 객체 add 해줘라. View로 추가를 해줘라

                ad.setPositiveButton("확인", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String result = et.getText().toString();
                        tv_result.setText(result);
                        dialog.dismiss();//현재 dialog 닫아라
                    }
                });


                ad.setNegativeButton("취소", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
                ad.show();
            }
        });
    }
}