Create spinner with strings from the resource folder (res >> value folder). On changing spinner value, change image.

Software-required: Android Studio

Pre-requisite: Basic knowledge of Android Studio.

Theory/Logic: -

Spinner is used to select one item from menu.
It is like Drop Down Menu.
I have added items in spinner by string.xml.

Program/Solution: -

Activity_main.xml file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:weightSum="1">
    <Spinner
        android:layout_width="wrap_content"
        android:id="@+id/spinner1"
        android:layout_height="wrap_content"
        android:entries="@array/img"
        android:layout_marginTop="50dp"
        android:layout_marginLeft="100dp"
    />
    <ImageView android:src="@drawable/icon"
        android:id="@+id/imageView1"
        android:layout_height="wrap_content"
        android:layout_weight="-5"
        android:layout_width="match_parent"
    />
</LinearLayout>

MainActivity.xml file:

package com.example./*Your Package Name*/;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ImageView;
import android.widget.Spinner;

public class MainActivity extends Activity implements
        OnItemSelectedListener {
    /** Called when the activity is first created. */
    Spinner sp;
    ImageView img;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sp=(Spinner)findViewById(R.id.spinner1);
        sp.setOnItemSelectedListener(this);
        img=(ImageView)findViewById(R.id.imageView1);
    }
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        if(arg2==0)
        {
            img.setImageResource(R.drawable.img1);
        }
        if(arg2==1)
        {
            img.setImageResource(R.drawable.img2);
        }
        if(arg2==2)
        {
            img.setImageResource(R.drawable.img3);
        }
    }
    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
    }
}

strings.xml file:

<resources>
    <string name="app_name">Practical8</string>
    <string name="hello">Hello World, Tut_2_1Activity!</string>
    <string-array name="img">
        <item>Labrador Retriever</item>
        <item>Bulldog</item>
        <item>Siberian Husky</item>
    </string-array>
</resources>