package com.easymorse.lazyload; 

import java.net.URL; 
import java.util.concurrent.ExecutorService; 
import java.util.concurrent.Executors; 

import android.app.Activity; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.os.Handler; 
import android.widget.ImageView; 

public class LazyLoadImageActivity extends Activity { 

    private ExecutorService executorService = Executors.newFixedThreadPool(1); 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        loadImage("http://www.chinatelecom.com.cn/images/logo_new.gif", R.id.image1); 
        loadImage("http://www.baidu.com/img/baidu_logo.gif", R.id.image2); 
        loadImage("http://cache.soso.com/30d/img/web/logo.gif", R.id.image3); 
    } 

    @Override 
    protected void onDestroy() { 
        executorService.shutdown(); 
        super.onDestroy(); 
    } 

    private void loadImage(final String url, final int id) { 
        final Handler handler=new Handler(); 
        executorService.submit(new Runnable() { 
            @Override 
            public void run() { 
                try { 
                    final Drawable drawable = Drawable.createFromStream( 
                            new URL(url).openStream(), "image.png"); 
                    handler.post(new Runnable() { 

                        @Override 
                        public void run() { 
                            ((ImageView) LazyLoadImageActivity.this 
                                    .findViewById(id)) 
                                    .setImageDrawable(drawable); 
                        } 
                    }); 
                } catch (Exception e) { 
                    throw new RuntimeException(e); 
                } 
            } 
        }); 
    } 
}