Android_java(13) - AlertDialogApp

대화 상자(dialog)
    1) 사용자에게 메시지를 출력하고 사용자로부터 입력을 받아들이는 아주 보편적인 UI임 
    2) 종류 
        - AlertDialog
            - 구성 
                - 제목
                - 콘텐츠 영역(메시지, 리스트, 커스텀 레이아웃 표시)
                - 액션 버튼(3개 이내의 버튼 - ok, cancel)
            - 생성 
                - AlertDialog.Builder 클래스로 생성 
        - DatePickerDialog
        - TimePickerDialog

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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="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tvName"
        android:hint="사용자 이름"
        android:textSize="20dp"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tvEmail"
        android:hint="이메일"
        android:textSize="20dp"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:hint="여기를 클릭하세요."/>

</LinearLayout>

<dialog.xml>

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="사용자 이름"
        android:textSize="20dp"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/dlgEdt1"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="이메일"
        android:textSize="20dp"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/dlgEdt2"/>

</LinearLayout>

<toast.xml>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ff0000"
    android:gravity="center">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView1"
        android:src="@drawable/btn_star_big_on"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/toastText"
        android:text="TextView.."
        android:textSize="20dp"/>
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView2"
        android:src="@drawable/btn_star_big_on"/>
</LinearLayout>

<MainActivity.java>

package kr.co.alertdialog;

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

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Display;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    TextView tvName, tvEmail;
    Button button;
    EditText dlgEdtName, dlgEdtEmail;
    TextView toastText;
    View dialogView, toastView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
        getSupportActionBar().setIcon(R.drawable.ic_launcher);
        setTitle("사용자 정보 입력(수정)");

        tvName = findViewById(R.id.tvName);
        tvEmail = findViewById(R.id.tvEmail);
        button = findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dialogView = View.inflate(MainActivity.this, R.layout.dialog, null);

                //대화상자 생성(빌더 객체 생성)
                AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this);
                //용도에 따른 설정
                dlg.setTitle("사용자 정보 입력");                      //제목 설정
                dlg.setIcon(R.drawable.ic_menu_allfriends);        //아이콘 설정
                dlg.setView(dialogView);

                dlgEdtName = dialogView.findViewById(R.id.dlgEdt1);
                dlgEdtEmail = dialogView.findViewById(R.id.dlgEdt2);

                dlgEdtName.setText(tvName.getText().toString());
                dlgEdtEmail.setText(tvEmail.getText().toString());

                //대화상자의 'OK' 버튼 부분 설정
                dlg.setPositiveButton("확인", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        tvName.setText(dlgEdtName.getText().toString());
                        tvEmail.setText(dlgEdtEmail.getText().toString());
                    }
                });

                //대화상자의 'Cancel' 버튼 부분 설정
                dlg.setNegativeButton("취소", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Toast toast = new Toast(MainActivity.this);

                        //토스트가 화면의 임의 위치에 나타내기 위해서임
                        Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
                        int xOffset = (int)(Math.random()*display.getWidth());
                        int yOffset = (int)(Math.random()*display.getHeight());

                        toast.setGravity(Gravity.TOP | Gravity.LEFT, xOffset, yOffset);
                        toastView = View.inflate(MainActivity.this, R.layout.toast, null);
                        toastText = toastView.findViewById(R.id.toastText);
                        toastText.setText("취소했습니다!");

                        toast.setView(toastView);
                        toast.show();
                    }
                });

                dlg.show();
            }
        });
    }
}

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