Spinner 드롭 다운

아코디언 형식으로 펼쳐지는 메뉴를 드롭다운 메뉴라고 함 android studio에선 Spinner라고 부름

 

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activity_main.xml

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

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="150dp"
        android:layout_height="40dp"
        android:entries="@array/test">
    </Spinner>

    <TextView
        android:id="@+id/tv_result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="드롭다운 결과"/>

</LinearLayout>

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app 폴더 안에 res 폴더에서 values 폴더 우클릭 후 array.xml 파일 생성

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array.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="test">
        <item>khon01</item>
        <item>khon02</item>
        <item>khon03</item>
    </string-array>

</resources>

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MainActivity.java

package com.example.spinner;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private Spinner spinner;
    private TextView tv_result;

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

        spinner = (Spinner)findViewById(R.id.spinner);
        tv_result = (TextView)findViewById(R.id.tv_result);

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                tv_result.setText(parent.getItemAtPosition(position).toString());
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }
}