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// Product.java
package com.example.mysamples;
public class Product{
public String id;
public String title;
public String img_url;
public Product(String p_title, String p_img_url) {
title = p_title;
img_url = p_img_url;
}
}
<!--
layout/grid_item.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/image"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_margin="dp"
android:contentDescription="icon"
android:layout_gravity="center"
/>
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_gravity="center"
/>
</LinearLayout>
<!--
layout/main_grid.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" >
<GridView
android:id="@+id/grid_products"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:gravity="center"
android:background="@android:color/transparent"
android:columnWidth="90dp"
android:verticalSpacing="8dp"
android:horizontalSpacing="8dp"
/>
</LinearLayout>
// Main Activity
package com.example.mysamples;
import android.app.Activity;
import android.os.Bundle;
import android.widget.AbsListView;
import android.widget.GridView;
import java.util.ArrayList;
import java.util.List;
public class MyActivityGrid extends Activity implements AbsListView.OnScrollListener {
List products;
GridView gvProducts = null;
ProductListAdapterWithCache adapterProducts;
private boolean lvBusy = false;
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_grid);
// populate data
products = new ArrayList();
products.add(new Product("Orange","http://farm5.staticflickr.com/4142/4787427683_3672f1db9a_s.jpg"));
products.add(new Product("Apple","http://farm4.staticflickr.com/3139/2780642603_8d2c90e364_s.jpg"));
products.add(new Product("Pineapple","http://farm2.staticflickr.com/1008/1420343003_13eeb0f9f3_s.jpg"));
products.add(new Product("Appricot","http://farm5.staticflickr.com/4118/4784687474_0eca8226b0_z.jpg"));
//
gvProducts = (GridView) findViewById( R.id.grid_products);
adapterProducts = new ProductListAdapterWithCache(this, products);
gvProducts.setAdapter(adapterProducts);
}
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
}
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:
lvBusy = false;
adapterProducts.notifyDataSetChanged();
break;
case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
lvBusy = true;
break;
case AbsListView.OnScrollListener.SCROLL_STATE_FLING:
lvBusy = true;
break;
}
}
public boolean isLvBusy(){
return lvBusy;
}
}
// ProductListAdapterWithCache.java
package com.example.mysamples;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.List;
public class ProductListAdapterWithCache extends ArrayAdapter<Product> {
private Context mContext;
List<Product> mylist;
public ProductListAdapterWithCache(Context _context, List<Product> _mylist) {
super(_context, R.layout.list_item, _mylist);
mContext = _context;
this.mylist = _mylist;
}
public View getView(int position, View convertView, ViewGroup parent) {
Product product = getItem(position);
ProductViewHolder holder;
if (convertView == null) {
convertView = new LinearLayout(getContext());
String inflater = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater vi = (LayoutInflater)getContext().getSystemService(inflater);
convertView = vi.inflate(R.layout.grid_item, parent, false);
//
holder = new ProductViewHolder();
holder.img = (ImageView)convertView.findViewById(R.id.image);
holder.title = (TextView)convertView.findViewById(R.id.title);
//
convertView.setTag(holder);
}
else{
holder = (ProductViewHolder) convertView.getTag();
}
//
holder.populate(product, ((MyActivityGrid)mContext).isLvBusy());
//
return convertView;
}
static class ProductViewHolder {
public ImageView img;
public TextView title;
void populate(Product p) {
title.setText(p.title);
//
ImageDownloader imageDownloader = new ImageDownloader();
imageDownloader.download(p.img_url, img);
}
void populate(Product p, boolean isBusy) {
title.setText(p.title);
if (!isBusy){
// download from internet
ImageDownloader imageDownloader = new ImageDownloader();
imageDownloader.download(p.img_url, img);
}
else{
// set default image
img.setImageResource(R.drawable.spinner);
}
}
}
}
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