[안드로이드 기본] 옵션메뉴 만들기

 

 

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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

MainActiviy.java

package com.example.optionmenu2;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

    //xml로 옵션메뉴 생성

    public boolean onCreateOptionsMenu(Menu menu){
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.mymenu, menu); //각 항목이 눌러지만 토스트 메시지를 출력한다.
        return true;

    }
/*
    //코드로 옵션메뉴 생성
    public boolean onCreateOptionsMenu(Menu menu){
        super.onCreateOptionsMenu(menu);

        MenuItem item1 = menu.add(0,1,0,"사과");
        item1.setIcon(R.drawable.ic_launcher_background);
        item1.setAlphabeticShortcut('a');

        menu.add(0,2,0,"포도").setIcon(R.drawable.ic_launcher_background);
        menu.add(0,3,0,"바나나").setIcon(R.drawable.ic_launcher_background);
        return true;

    }
    */

    public boolean onOptionsItemSelected(MenuItem item){
        switch (item.getItemId()){
            case R.id.apple :
                Toast.makeText(this,"사과",Toast.LENGTH_SHORT).show();
                return true;
            case R.id.grape :
                Toast.makeText(this,"포도",Toast.LENGTH_SHORT).show();
                return true;
            case R.id.banana :
                Toast.makeText(this,"바나나",Toast.LENGTH_SHORT).show();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

 

mymenu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
    android:id="@+id/apple"
    android:icon="@drawable/ic_launcher_background"
    android:title="사과"/>
<item
    android:id="@+id/grape"
    android:icon="@drawable/ic_launcher_background"
    android:title="포도"/>
<item
    android:id="@+id/banana"
    android:icon="@drawable/ic_launcher_background"
    android:title="바나나"/>
</menu>