Android] Dialog를 사용하여 알림 창 띄우기

Dialog 를 이용하여 알림창 띄우는 방법

알림창을 띄우기 위해서 AlertDialog를 사용 하면 된다.

 

1. activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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/DialogBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="알림창 띄우기"

        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

기본 버튼 하나 생성

2. MainActivity.java

package com.example.dialog;

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

import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

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

        Button DialogBtn = (Button) findViewById(R.id.DialogBtn);
        DialogBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
                
                dialog.setPositiveButton("닫기", new DialogInterface.OnClickListener() { // 버튼 생성
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                    }
                });
                dialog.setTitle("알림창"); // 타이틀 설정
                dialog.setMessage("메세지");// 메세지 설정
                dialog.show(); //알림창 출력
            }
        });

    }
}

AlertDialog 객체를 생성한뒤 set~ 명령어를 통해 알림 창을 설정 할 수 있다.

 

3. 출력화면

버튼 클릭시)

 

---

-정보를 입력받아 입력창으로 출력하기

1. 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"
    tools:context=".MainActivity"
    android:orientation="vertical">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="이름 : "
            android:textSize="30dp"/>
        <EditText
            android:id="@+id/nameEdit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="10"
            android:hint="이름을 입력하십시오."
            />

    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="나이 : "
            android:textSize="30dp"/>
        <EditText
            android:id="@+id/ageEdit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="10"
            android:hint="나이를 입력하십시오."
            />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="성별 : "
            android:textSize="30dp"/>
        <EditText
            android:id="@+id/sexEdit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="10"
            android:hint="성별을 입력하십시오."
            />

    </LinearLayout>

    <Button
        android:id="@+id/DialogBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="정보 보기"
        android:layout_gravity="center"
       />

</LinearLayout>

2. MainActivity.java

package com.example.dialog;

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

import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

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

        EditText nameEdit = (EditText)findViewById(R.id.nameEdit);
        EditText ageEdit = (EditText)findViewById(R.id.ageEdit);
        EditText sexEdit = (EditText)findViewById(R.id.sexEdit);

        Button DialogBtn = (Button) findViewById(R.id.DialogBtn);
        DialogBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);

                dialog.setPositiveButton("닫기", new DialogInterface.OnClickListener() { // 버튼 생성
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                    }
                });
                dialog.setTitle("알림창"); // 타이틀 설정
                dialog.setMessage("이름 : "+nameEdit.getText().toString()+System.lineSeparator()+
                        "나이 : " +ageEdit.getText().toString()+System.lineSeparator()+
                        "성별 : " +sexEdit.getText().toString()+System.lineSeparator());// 메세지 설정
                dialog.show(); //알림창 출력
            }
        });

    }
}

3. 실행 화면

버튼 클릭시)