PostImages.java

//PostImages.java - class to store user images and reuse images with the same URL.

package com.apigee.model;

import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;

import android.graphics.drawable.Drawable;

public class PostImages {

	//images keeps a list of images grabbed so far.
	//imageUrls stores the corresponding url for the images stored.
	ArrayList<Drawable> images = new ArrayList<Drawable>();
	ArrayList<String> imageUrls = new ArrayList<String>();


	//Add image to list of images and add url
	public void addImage(Drawable image, String url){
		images.add(image);
		imageUrls.add(url);
	}


	//Remove all images and urls
	public void clearImages(){
		images.clear();
		imageUrls.clear();
	}


	//Return image for given url. Checks if image is already stored and 
	//if not calls function to load image from url.
	public Drawable getImage(String url) {
		if (url!=null) {
			//look for image in list
			int index = imageUrls.indexOf(url);
			if (index!=-1) {
				return images.get(index);
			} else {
				//grab from url and store in list
				Drawable image = LoadImageFromWebOperations(url);
				addImage(image,url);
				return image;
			}
		} else {
			return null;
		}
	}


	//Function to grab an image from a given url.
	private Drawable LoadImageFromWebOperations(String url)
	{
		try{
			InputStream is = (InputStream) new URL(url).getContent();
			Drawable d = Drawable.createFromStream(is, "src name");
			return d;
		}catch (Exception e) {
			System.out.println("Exc="+e);
			return null;
		}
	}
}