Android ImageView example

image = (ImageView) findViewById(R.id.imageView1);

image.setImageResource(R.drawable.android3d);

See https://www.mkyong.com/android/android-imageview-example/
For more details

1. Add Image to Resources

Put your images into folder “res/drawable-ldpi“, “res/drawable-mdpi” or “res/drawable-hdpi“.

See figure below, no matter which folder you put, Android will find your image automatically. In this case, both “android.png” and “android3d.png” images are used for demonstration.

2. Add ImageView

Open “res/layout/main.xml” file, just add an ImageView and Button for demonstration. By default, imageView1 will display “android.png”.

File : res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/android" />

    <Button
        android:id="@+id/btnChangeImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Change Image" />

</LinearLayout>

3. Code Code

Simple, when button is clicked, change it to “android3d.png”.

File : MyAndroidAppActivity.java

package com.mkyong.android;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;
import android.view.View;
import android.view.View.OnClickListener;

public class MyAndroidAppActivity extends Activity {

 Button button;
 ImageView image;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  addListenerOnButton();

 }

 public void addListenerOnButton() {

  image = (ImageView) findViewById(R.id.imageView1);

  button = (Button) findViewById(R.id.btnChangeImage);
  button.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View arg0) {
    image.setImageResource(R.drawable.android3d);
   }

  });

 }

}