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1. 프로젝트 생성

프로젝트명 : ContextMenuTest

2. res/menu 폴더 생성

res 아래에 menu 폴더를 생성한다.

3. menu_item.xml 파일 생성

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item

        android:id="@+id/item1"

        android:title="item1"></item>

    <item

        android:id="@+id/item2"

        android:title="item2"></item>

</menu>

4. activity_main.xml 수정

버튼으로 수정한다.

<?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/button1" 

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Button1"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

5. MainActivity.kt 수정

package kr.co.leelab.contextmenutest

import androidx.appcompat.app.AppCompatActivity

import android.os.Bundle

import android.view.ContextMenu

import android.view.MenuItem

import android.view.View

import android.widget.Button

import android.widget.Toast

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        val button1 : Button = findViewById(R.id.button1)

        button1.setOnClickListener {

            it.showContextMenu()

        }

        registerForContextMenu(button1)

    }

    override fun onCreateContextMenu(

        menu: ContextMenu?,

        v: View?,

        menuInfo: ContextMenu.ContextMenuInfo?

    ) {

        super.onCreateContextMenu(menu, v, menuInfo)

        when(v?.id) {

            R.id.button1 -> {

                menu?.setHeaderTitle("메뉴 선택")

                menuInflater.inflate(R.menu.menu_item, menu)

            }

        }

    }

    override fun onContextItemSelected(item: MenuItem): Boolean {

        when(item.itemId) {

            R.id.item1 -> {

                Toast.makeText(this, "item1 선택" , Toast.LENGTH_SHORT).show()

            }

            R.id.item2 -> {

                Toast.makeText(this, "item2 선택" , Toast.LENGTH_SHORT).show()

            }

        }

        return super.onContextItemSelected(item)

    }

}

6. 실행

버튼을 누르고 ContextMenu 를 확인한다.