UABAndroidExamples/ThreadingUIThread/src/org/uab/android/threading/uithread/MainActivity.java

package org.uab.android.threading.uithread;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
	
	Button		loadImageButton;
	Button		sayHelloButton;
	
	ImageView	imageView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		imageView = (ImageView) findViewById(R.id.imageView1);
		
		loadImageButton = (Button) findViewById(R.id.loadImage);
		loadImageButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				
				loadImage();
			}
		});
		
		sayHelloButton = (Button) findViewById(R.id.sayhello);
		sayHelloButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				
				Toast.makeText(MainActivity.this, "Hello class!",
						Toast.LENGTH_SHORT).show();
			}
		});
	}
	
	public void loadImage() {
		
		// Load image from drawable directory
		Bitmap bitmapImage = BitmapFactory.decodeResource(getResources(), R.drawable.grumpycat);
				
		// Simulate a long-running operation
		try {
			Thread.sleep(5000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
				
		// Set the decoded bitmap as the ImageView's source
		if ( bitmapImage != null ) 
			imageView.setImageBitmap(bitmapImage);
		
	}
}