[안드로이드 스튜디오] 메뉴 등록하기

activtiy_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" >

    <LinearLayout
        android:id="@+id/layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="1dp">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="메뉴선택예제"
            android:gravity="center"
            tools:layout_editor_absoluteX="166dp"
            tools:layout_editor_absoluteY="355dp" />
    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

---

1. res의 menu 디렉터리 생성
2. menu 디렉터리 안에 리소스 파일 생성해서 mymenu.xml 생성

mymenu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/blue"
        android:icon="@android:drawable/btn_star_big_on"
        android:title="파랑색"
        app:showAsAction="never" />
    <item
        android:id="@+id/green"
        android:icon="@android:drawable/ic_btn_speak_now"
        android:title="초록색"
        app:showAsAction="never" />
    <item
        android:id="@+id/red"
        android:icon="@android:drawable/checkbox_on_background"
        android:title="빨강색"
        app:showAsAction="never" />
</menu>

---

MainActivity.java

package com.example.a07_14;

import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

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

public class MainActivity extends AppCompatActivity {
    View view1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        view1 = findViewById(R.id.layout);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.mymenu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        int id = item.getItemId();
        if (id==R.id.blue) {
            view1.setBackgroundColor(Color.BLUE);
            return true;
        } else if (id==R.id.green) {
            view1.setBackgroundColor(Color.GREEN);
            return true;
        } else if (id==R.id.red) {
            view1.setBackgroundColor(Color.RED);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

themes 두 파일 안에 DayNight뒤에 글자를 지워줍니다.

---

---

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/blue"
        android:icon="@android:drawable/btn_star_big_on"
        android:title="파랑색"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/green"
        android:icon="@android:drawable/ic_btn_speak_now"
        android:title="초록색"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/red"
        android:icon="@android:drawable/checkbox_on_background"
        android:title="빨강색"
        app:showAsAction="ifRoom" />
</menu>

•  app:showAsAction="ifRoom"으로 바꾸면 아이콘이 뜬다.