Android Program to Change the Image on the Screen

Here is source code of the Program to Change the Image Displayed on the Screen in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

Note
Remember to put your images in res/drawable-hdpi/ directory and then clean your project in order to use the images in your current working Application.

Main Activity

 
package com.example.changeiamge;
 
import android.app.Activity;
import android.graphics.Typeface;
import android.os.Bundle;
import android.renderscript.Type;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
 
public class MainActivity extends Activity implements OnCheckedChangeListener {
 
    RadioGroup group1, group2;
    Button gen;
    ImageView img;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        group1 = (RadioGroup) findViewById(R.id.rg1);
        group1.setOnCheckedChangeListener((OnCheckedChangeListener) this);
 
        group2 = (RadioGroup) findViewById(R.id.rg2);
        group2.setOnCheckedChangeListener((OnCheckedChangeListener) this);
 
        img = (ImageView) findViewById(R.id.imageView1);
        // oncheckedChanged function
        gen = (Button) findViewById(R.id.button1);
        gen.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
 
            }
        });
 
    }
 
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        // TODO Auto-generated method stub
        switch (checkedId) {
        case R.id.radioButton1:
            img.setImageResource(R.drawable.image4);
            break;
 
        case R.id.radioButton2:
            img.setImageResource(R.drawable.image5);
            break;
 
        case R.id.radioButton3:
            img.setImageResource(R.drawable.image6);
            break;
 
        case R.id.radioButton4:
            img.setImageResource(R.drawable.image7);
            break;
 
        default:
            break;
        }
    }
}

ActivityMain.xml

<RelativeLayout 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: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=".MainActivity" >
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingBottom="40px"
        android:weightSum="2" >
 
        <RadioGroup
            android:id="@+id/rg1"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="vertical" >
 
            <RadioButton
                android:id="@+id/radioButton1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_alignParentTop="true"
                android:layout_marginTop="20dp"
                android:text="Image2" />
 
            <RadioButton
                android:id="@+id/radioButton2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBaseline="@+id/radioButton1"
                android:layout_alignBottom="@+id/radioButton1"
                android:layout_alignParentLeft="true"
                android:text="Image1" />
        </RadioGroup>
 
        <RadioGroup
            android:id="@+id/rg2"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="vertical" >
 
            <RadioButton
                android:id="@+id/radioButton3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="30dp"
                android:text="Image3" />
 
            <RadioButton
                android:id="@+id/radioButton4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignBaseline="@+id/radioButton3"
                android:layout_alignBottom="@+id/radioButton3"
                android:layout_alignParentRight="true"
                android:text="Image4" />
        </RadioGroup>
    </LinearLayout>
 
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:text="Change Image" />
 
    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/button1"
        android:layout_marginTop="50dp"
        android:src="@drawable/ic_launcher" />
 
</RelativeLayout>

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