[안드로이드 앱] 실습7-1 배경색 변경 앱 만들기

• activity_main.xml

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

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="오른쪽 위 메뉴를 클릭하세요"
        android:textSize="20dp"
        android:layout_gravity="center"/>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:textSize="20dp"
        android:text="이건 버튼"/>

</LinearLayout>

 

• menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/itemRed"
        android:title="배경색(빨강)"/>
    <item
        android:id="@+id/itemGreen"
        android:title="배경색(초록)"/>
    <item
        android:id="@+id/itemBlue"
        android:title="배경색(파랑)"/>

    <item
        android:title="버튼 변경>> ">
        <menu>
            <item
                android:id="@+id/subRotate"
                android:title="버튼 45도 회전"/>
            <item
                android:id="@+id/subSize"
                android:title="버튼 2배 확대"/>
        </menu>
    </item>


</menu>

 

• MainActivity.java

package com.example.exam7_1;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {
    //변수선언
    LinearLayout baseLayout;
    Button button1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("배경색 바꾸기 - 양다연(23/5/18)");

        baseLayout = (LinearLayout) findViewById(R.id.baseLayout);
        button1 = (Button) findViewById(R.id.button1);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        //메뉴파일 코드 삽입
        MenuInflater mInflater = getMenuInflater();
        mInflater.inflate(R.menu.menu1,menu);
        return true;
    }

    //메뉴 선택시 동작할 내용을 코딩
    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch(item.getItemId()) {
            case R.id.itemRed:
                baseLayout.setBackgroundColor(Color.RED);
                return true;
            case R.id.itemGreen:
                baseLayout.setBackgroundColor(Color.GREEN);
                return true;
            case R.id.itemBlue:
                baseLayout.setBackgroundColor(Color.BLUE);
                return true;
            case R.id.subRotate:
                button1.setRotation(45);
                return true;
            case R.id.subSize:
                button1.setScaleX(2);
                return true;
        }
        return false;
    }
}

 

• 실행 화면

0123

그냥 따라 쓰기만 한 코드지만 menu사용을 첨 해봐서 우선 기록...