Android Example-Change the Image on Activity Using Radio Button

activity_main.xml

<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"

    tools:context=".MainActivity">

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="horizontal">

        <RadioGroup
            android:id="@+id/rg1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:paddingTop="20dp"
            android:gravity="center_horizontal"
            android:orientation="horizontal">

            <RadioButton
                android:id="@+id/radioButton1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Frag 1" />

            <RadioButton
                android:id="@+id/radioButton2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Frag 2" />

            <RadioButton
                android:id="@+id/radioButton3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Frag 3" />

            <RadioButton
                android:id="@+id/radioButton4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"

                android:text="Frag 4" />

            <RadioButton
                android:id="@+id/radioButton5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"

                android:text="Frag 5" />
        </RadioGroup>


    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center">

        <ImageView
            android:id="@+id/imageView1"

            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/image1" />
    </LinearLayout>


</LinearLayout>

MainActivity.java

package in.kantapp.example4;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends AppCompatActivity implements OnCheckedChangeListener {

    RadioGroup group1, group2;
    Button gen;
    ImageView img;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        group1 = (RadioGroup) findViewById(R.id.rg1);
        group1.setOnCheckedChangeListener((OnCheckedChangeListener) this);
        img = (ImageView) findViewById(R.id.imageView1);
       }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        // TODO Auto-generated method stub
        switch (checkedId) {
            case R.id.radioButton1:
                img.setImageResource(R.drawable.image1);
                break;

            case R.id.radioButton2:
                img.setImageResource(R.drawable.image2);
                break;

            case R.id.radioButton3:
                img.setImageResource(R.drawable.image3);
                break;

            case R.id.radioButton4:
                img.setImageResource(R.drawable.image4);
                break;
            case R.id.radioButton5:
                img.setImageResource(R.drawable.image5);
                break;

            default:
                break;
        }
    }
}

Download Image: