public class MyApplication extends Application {@Overridepublic void onCreate() {super.onCreate();initImageLoader();}public void initImageLoader(){ImageLoaderConfiguration.Builder config = new ImageLoaderConfiguration.Builder(getApplicationContext());config.threadPriority(Thread.NORM_PRIORITY - 2);config.denyCacheImageMultipleSizesInMemory();config.diskCacheFileNameGenerator(new Md5FileNameGenerator());config.diskCacheSize(50*1024*1024);config.tasksProcessingOrder(QueueProcessingType.LIFO);config.writeDebugLogs();ImageLoader.getInstance().init(config.build());}
}

public class MyImageListActivity extends Activity {@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.fr_image_list);ListView listView = findViewById(R.id.listview);listView.setAdapter(new ImageAdapter());listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){@Overridepublic void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {Log.i("test","click "+i);}});}@Overrideprotected void onDestroy() {//回收缓存在内存中的图片
        ImageLoader.getInstance().clearMemoryCache();super.onDestroy();}private class ImageAdapter extends BaseAdapter{private String[] IMAGES_URI = new String[]{"http://mowin.org/wp-content/uploads/2017/07/arborists-forestry.jpg","http://s1.1zoom.me/big0/506/Sky_Grasslands_Rainbow_502473.jpg",};// 创建DisplayImageOptions对象private DisplayImageOptions options;public ImageAdapter() {options = new DisplayImageOptions.Builder().showImageOnLoading(R.drawable.dog)  // 下载期间显示的图片.showImageForEmptyUri(R.drawable.dog)//Uri为空或是错误的时候显示的图片.showImageOnFail(R.drawable.ic_launcher_background)//发生错误显示的图片.cacheInMemory(true)//载的图片是否缓存在内存中.cacheOnDisk(true)//载的图片是否缓存在sdcard中.considerExifParams(true).displayer(new CircleBitmapDisplayer(Color.WHITE,5))//图片
                    .build();}@Overridepublic int getCount() {return IMAGES_URI.length;}@Overridepublic Object getItem(int i) {return IMAGES_URI[i];}@Overridepublic long getItemId(int i) {return i;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {ViewHolder holder;if(view == null){holder = new ViewHolder();view = LayoutInflater.from(MyImageListActivity.this).inflate(R.layout.item_list_image,null);holder.imageView = (ImageView)view.findViewById(R.id.item_image);holder.textView = (TextView)view.findViewById(R.id.item_name);view.setTag(holder);}else{holder = (ViewHolder)view.getTag();}holder.textView.setText("Item " + (i + 1));//
            ImageLoader.getInstance().displayImage(IMAGES_URI[i],holder.imageView,options);return view;}}static  class ViewHolder{ImageView imageView;TextView textView;}
}

public static final Bitmap.Config ALPHA_8
public static final Bitmap.Config ARGB_4444
public static final Bitmap.Config ARGB_8888
public static final Bitmap.Config RGB_565