AdapterView: Spinner

Spinner (스피너)

1. values에 배열 타입 xml을 만든다. (arrays.xml)

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="plants_array">
        <item>Mercury</item>
        <item>Venus</item>
        <item>Earth</item>
        <item>Mars</item>
    </string-array>
</resources>

2. layout에서 Spinner를 사용하여 불러와준다. (activity_main.xml)

스피너의 ID는 spinner1로 지정해줬다.

글자색이 흰색이라 보이지 않으므로 스피너에 백그라운드를 지정해줬다.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <Spinner
        android:background="#d2d2d2"
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/plants_array"
        />


</LinearLayout>

3. 스피너의 객체를 반환 받아올 실행 클래스 (MainActivity.java)

package com.progdv.app04_spinner;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

import com.progdv.app04_spinner.R;

public class MainActivity extends AppCompatActivity {
    Spinner spinner;

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

        spinner = (Spinner)findViewById(R.id.spinner1);

        ArrayAdapter adapter =
                ArrayAdapter.createFromResource(getApplicationContext(),
                        R.array.plants_array, android.R.layout.simple_spinner_item);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){


            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                Log.i("MyTag", "인덱스:"+position);
            }

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

            }
        });
    }
}