Android开发之ImageLoader使用详解

package com.demo.content;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.GridView;
public class MyGridView extends GridView {
public MyGridView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyGridView(Context context) {
super(context);
}
public MyGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
} 
<&＃63;xml version="1.0" encoding="utf-8"&＃63;>








 
package com.demo.activity;
import java.util.ArrayList;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONObject;
import com.demo.content.MyGridView;
import com.demo.entity.Product;
import com.demo.pullrefresh.R;
import com.demo.util.GetThread;
import com.nostra.universalimageloader.core.DisplayImageOptions;
import com.nostra.universalimageloader.core.ImageLoader;
import com.nostra.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra.universalimageloader.core.assist.ImageScaleType;
import com.nostra.universalimageloader.core.display.FadeInBitmapDisplayer;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MyMainActivity extends Activity {
// 定义的布局
private MyGridView myGridView;
private DisplayImageOptions options;
// 产品
private List products;
// 地址
private String url = ""
+ "Product/GetProductsByProType//";
@Override
protected void onCreate(Bundle arg) {
// TODO Auto-generated method stub
super.onCreate(arg);
setContentView(R.layout.mymainactivity);
optiOns= new DisplayImageOptions.Builder()
.showImageForEmptyUri(R.drawable.ic_empty)
// image连接地址为空时
.showImageOnFail(R.drawable.ic_error)
// image加载失败
.resetViewBeforeLoading(true).cacheOnDisc(true)
.imageScaleType(ImageScaleType.EXACTLY)
.bitmapConfig(Bitmap.Config.RGB_)
.displayer(new FadeInBitmapDisplayer())// 设置用户加载图片task（这里是渐现图片显示）
.build();
// 创建默认的ImageLoader的参数 不加回报java.lang.IllegalStateException
// 但不是每次用到ImageLoader都要加
ImageLoader.getInstance().init(
ImageLoaderConfiguration.createDefault(this));
myGridView = (MyGridView) findViewById(R.id.gg_mygridview);
// 开启线程
new GetThread(url, handler).start();
}
@SuppressLint("HandlerLeak")
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case GetThread.SUCCESS:
String jsOnString= (String) msg.obj;
// 用JSON来解析数据
products = getJsonProducts(jsonString);
Log.d("jiejie", "DDDDDDD" + products);
// 创建个适配器
Adapter adapter = new Adapter();
myGridView.setAdapter(adapter);
break;
default:
break;
}
};
};
protected List getJsonProducts(String jsonString) {
List resultTempList = new ArrayList();
try {
JSONArray array = new JSONArray(jsonString);
for (int i = ; i