异步加载

import android.app.Application;
import android.os.Environment;

import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiscCache;
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

import java.io.File;



public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        File cachefile= new File(Environment.getExternalStorageDirectory().getPath()+"/images");
      //  ImageLoaderConfiguration configuration=new ImageLoaderConfiguration.Builder(this);
        ImageLoaderConfiguration configuration=new ImageLoaderConfiguration.Builder(this)
                .memoryCacheExtraOptions(400, 700)
                .threadPoolSize(3)
                .threadPriority(4)
                .memoryCacheSize(20*1024*1024)
                .diskCacheSize(80*1024*1024)
                .diskCache(new UnlimitedDiscCache(cachefile))
                .writeDebugLogs()
                .diskCacheFileNameGenerator(new Md5FileNameGenerator())
                .build();
        ImageLoader.getInstance().init(configuration);
    }
    }