Android-Universal-Image-Loader使用demo,超详细！！！

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

public class MyApplication extends Application {

@Override
public void onCreate() {
super.onCreate();
initImageLoader(getApplicationContext());
}

public static void initImageLoader(Context context) {
// 缓存文件的目录
File cacheDir = StorageUtils.getOwnCacheDirectory(context, "mycache");//sdcard目录
ImageLoaderConfiguration config =
new ImageLoaderConfiguration.Builder(context).memoryCacheExtraOptions(480, 800) // max
// height，即保存的每个缓存文件的最大长宽
.threadPoolSize(3)
// 线程池内加载的数量
.threadPriority(Thread.NORM_PRIORITY - 2)
.denyCacheImageMultipleSizesInMemory()
//
.discCacheFileNameGenerator(new Md5FileNameGenerator())
// 将保存的时候的URI名称用MD5 加密
.memoryCache(new UsingFreqLimitedMemoryCache(2 * 1024 * 1024))
// You can pass your own memory cache
// implementation/你可以通过自己的内存缓存实现
.memoryCacheSize(2 * 1024 * 1024)
// 内存缓存的最大值
.discCacheSize(50 * 1024 * 1024)
// 50 Mb sd卡(本地)缓存的最大值
.tasksProcessingOrder(QueueProcessingType.LIFO)
// 由原先的discCache -> diskCache
.discCache(new UnlimitedDiscCache(cacheDir))
// 自定义缓存路径
.imageDownloader(new BaseImageDownloader(context, 5 * 1000, 30 * 1000))
// connectTimeout (5 s), readTimeout (30 s)超时时间
.writeDebugLogs()
// Remove for release app
.build();
// 全局初始化此配置
ImageLoader.getInstance().init(config);
}
}

package com.example.imageloader;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.ImageLoadingProgressListener;

public class MainActivity extends Activity {

private GridView gridView;
private List<String> urlList = new ArrayList<String>();

private ImageLoader imageLoader;

private DisplayImageOptions options; // 设置图片显示相关参数

private String uri1 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3063552411,3030228420&fm=111&gp=0.jpg";
private String uri2 =
"https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2546610023,3120506294&fm=111&gp=0.jpg";
private String uri3 =
"https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=4236942158,2307642402&fm=116&gp=0.jpg";
private String uri4 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1589956140,1606448699&fm=116&gp=0.jpg";
private String uri5 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1017606633,46849118&fm=111&gp=0.jpg";
private String uri6 =
"https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1861283441,1807800896&fm=111&gp=0.jpg";
private String uri7 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=2033765348,1346395611&fm=116&gp=0.jpg";
private String uri8 =
"https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=731307697,3873909574&fm=111&gp=0.jpg";
private String uri9 =
"https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=4271053251,2424464488&fm=116&gp=0.jpg";
private String uri10 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=161888459,1712714238&fm=116&gp=0.jpg";
private String uri11 = // 改路径错误，为了测试加载失败的时候显示的图片
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/=2189035302,1073444789&fm=111&gp=0.jpg";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

urlList.add(uri1);
urlList.add(uri2);
urlList.add(uri3);
urlList.add(uri4);
urlList.add(uri5);
urlList.add(uri6);
urlList.add(uri7);
urlList.add(uri8);
urlList.add(uri9);
urlList.add(uri10);
urlList.add(uri11);
gridView = (GridView) findViewById(R.id.gridView);

gridView.setAdapter(new GridAdapter(getApplicationContext()));

imageLoader = ImageLoader.getInstance();
// 使用DisplayImageOptions.Builder()创建DisplayImageOptions
options = new DisplayImageOptions.Builder().showImageOnLoading(R.drawable.ic_stub) // 设置图片下载期间显示的图片
.showImageForEmptyUri(R.drawable.bg_img)
// 设置图片Uri为空或是错误的时候显示的图片
.showImageOnFail(R.drawable.bg_img)
// 设置图片加载或解码过程中发生错误显示的图片
.cacheInMemory(true)
// 设置下载的图片是否缓存在内存中
.cacheOnDisc(true)
// 设置下载的图片是否缓存在SD卡中
// .displayer(new RoundedBitmapDisplayer(20))
// 设置成圆角图片
.build(); // 构建完成

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

class GridAdapter extends BaseAdapter {

private Context context;

public GridAdapter(Context context) {
this.context = context;
}

@Override
public int getCount() {
return urlList.size();
}

@Override
public Object getItem(int position) {
return urlList.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder viewHolder = null;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.img_item, null);
viewHolder = new ViewHolder();
viewHolder.imgItem = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(viewHolder);
}
else {
viewHolder = (ViewHolder) convertView.getTag();
}

// !!!加载图片
imageLoader.displayImage(urlList.get(position), viewHolder.imgItem, options, new ImageLoadingListener() {

// 该参数可选

@Override
public void onLoadingStarted(String arg0, View arg1) {
// 开始加载
}

@Override
public void onLoadingFailed(String arg0, View arg1, FailReason arg2) {
// 加载失败
}

@Override
public void onLoadingComplete(String arg0, View arg1, Bitmap arg2) {
// 加载完成
}

@Override
public void onLoadingCancelled(String arg0, View arg1) {
// 加载取消
}
}, new ImageLoadingProgressListener() {

// 该参数可选

@Override
public void onProgressUpdate(String arg0, View arg1, int arg2, int arg3) {
// 更新进度条
}
});

return convertView;
}

class ViewHolder {
ImageView imgItem;
}

}

}