android - Adapter, Spinner, imageView, setOnItemSelectedListener

package com.example.it.myapplication9_6;

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.ImageView;
import android.widget.Spinner;

public class MainActivity extends AppCompatActivity {

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

        final String[] movie = { "쿵푸팬더", "짱구는 못말려", "아저씨",
                                "아바타", "대부", "국가대표",
                                "토이스토리3", "마당을 나온 암탉", "죽은 시인의 사회",
                                "서유기" };
        final Integer [] movieImg = {R.drawable.mov21,R.drawable.mov22,R.drawable.mov23,
                R.drawable.mov24,R.drawable.mov25,R.drawable.mov26,
                R.drawable.mov27,R.drawable.mov28,R.drawable.mov29,
                R.drawable.mov30};


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

        ArrayAdapter<String> adapter ;
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, movie);
        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                ImageView imgView1 = (ImageView) findViewById(R.id.imgView1);
                imgView1.setImageResource(movieImg[position]);
            }

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

            }
        });
    }
}

<?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="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/imgView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@mipmap/ic_launcher" />

</LinearLayout>