SprinnerActivity

 

package com.example.choi.ex02;

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

public class SprinnerActivity extends AppCompatActivity {

    //1.변수 선언
    TextView txtResult;
    Spinner spinner1;
    String[] arr={"포도", "사과", "배", "귤", "딸기", "감", "대추"};


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

        //2.객체 생성
        txtResult=(TextView)findViewById(R.id.txtResult);
        spinner1=(Spinner)findViewById(R.id.spinner1);

        //3. 아답터 생성
        //new ArrayAdapter<자료형>(컨텍스트, 레이아웃, 데이터)
        //Context(컨텍스트) : 문맥, 흐름, 현재 화면
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_dropdown_item, arr);
        //4. 스피너에 아답터를 연결시킴(데이터 뷰로 변환됨)
        spinner1.setAdapter(adapter);

        //5.스피너의 아이템 선택 이벤트
        spinner1.setOnItemSelectedListener(
                new AdapterView.OnItemSelectedListener() {

                    //아이템을 선택했을 때
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                //스피너의 선택한 아이템을 텍스트뷰에 출력
                txtResult.setText(arr[position]);
            }

                    //아이템을 선택하지 않았을 때
            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });


    }







}

 

 

spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/sprinner"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.choi.ex02.SprinnerActivity">

    <TextView
        android:text="TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/txtResult" />

    <Spinner
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/spinner1"
        android:layout_below="@+id/txtResult"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="18dp" />

</RelativeLayout>