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1. 레이아웃 추가

파일명 : 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/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Show Popup"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

2. res/menu 디렉토리 생성

3. popup_menu.xml 추가

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

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

    <item

        android:id="@+id/one"

        android:title="One"/>

    <item

        android:id="@+id/two"

        android:title="Two"/>

    <item

        android:id="@+id/three"

        android:title="Three"/>

</menu>

4. 엑티비티 수정

파일명 : MainActivity.kt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        val button1 = findViewById<Button>(R.id.button1)

        button1.setOnClickListener {

            val popup = PopupMenu(this, button1)

            popup.menuInflater.inflate(R.menu.poupup_menu, popup.menu)

            popup.setOnMenuItemClickListener {

                Toast.makeText( this, "clicked : "+it.title, Toast.LENGTH_SHORT).show()

                return@setOnMenuItemClickListener true

            }

            popup.show()

        }

    }

}

5. 실행