1、首先在當(dāng)前程序的Application中調(diào)用ImageLoader的初始化init()方法

private void initImageLoader() {  
    ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this).imageDownloader(  
        new BaseImageDownloader(this, 60 * 1000, 60 * 1000)) // connectTimeout超時(shí)時(shí)間  
            .build();  
    ImageLoader.getInstance().init(config);  
 }  

2、下載圖片的參數(shù)選項(xiàng)配置

/** 
  * 調(diào)用該方法下載圖片 
  * 配置imageLoader圖片選項(xiàng) 
  * @param iv  顯示圖片控件 
  * @param url  網(wǎng)絡(luò)或本地圖片地址 
  * @param defaultPic  默認(rèn)圖片 
  * @param isRound  true為圓形，false不處理 
  * @param cacheOnDisk true緩存到SD卡，false不緩存到SD卡 
  */  
public static void displayImages(ImageView iv,String url,int defaultPic,boolean isRound,boolean cacheOnDisk){  
    //配置一些圖片選項(xiàng)  
    DisplayImageOptions options = new DisplayImageOptions.Builder()  
    .showImageOnLoading(defaultPic)// 設(shè)置圖片在下載期間顯示的圖片  
    .showImageForEmptyUri(defaultPic)// 設(shè)置圖片Uri為空或是錯(cuò)誤的時(shí)候顯示的圖片  
    .showImageOnFail(defaultPic)// 設(shè)置圖片加載/解碼過(guò)程中錯(cuò)誤時(shí)候顯示的圖片  
    .cacheInMemory(false)// 設(shè)置下載的圖片是否緩存在內(nèi)存中  
    .cacheOnDisk(cacheOnDisk)// 設(shè)置下載的圖片是否緩存在SD卡中  
    .considerExifParams(true)//是否考慮JPEG圖像EXIF參數(shù)（旋轉(zhuǎn)，翻轉(zhuǎn)）  
    .displayer(isRound ? new CircleBitmapDisplayer() : new SimpleBitmapDisplayer())//FadeInBitmapDisplayer(200)listview加載閃爍問(wèn)題  
    .imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2)//圖片將降低2倍，直到下一減少步驟，使圖像更小的目標(biāo)大小  
    .bitmapConfig(Bitmap.Config.RGB_565)//圖片色彩565  
    .build();  
    imageLoader.displayImage(url, iv, options);  //加載網(wǎng)絡(luò)圖片url

3、擴(kuò)展，圖片顯示方式，圓角；CircleBitmapDisplayer()

private static class CircleBitmapDisplayer implements BitmapDisplayer {  
    final int margin ;  
    public CircleBitmapDisplayer() {  
        this(0);  
    }  
    public CircleBitmapDisplayer(int margin) {  
        this.margin = margin;  
    }  
    @Override  
    public void display(Bitmap bitmap, ImageAware imageAware, LoadedFrom loadedFrom) {  
        if (!(imageAware instanceof ImageViewAware)) {  
             throw new IllegalArgumentException("ImageAware should wrap ImageView. ImageViewAware is expected.");
        }
        imageAware.setImageBitmap(ToRoundBitmap.toRoundBitmap(bitmap));  
    }  
 }

4、返回圓形bitmap；toRoundBitmap()

public static  Bitmap toRoundBitmap(Bitmap bitmap) {  
         int width = bitmap.getWidth();  
         int height = bitmap.getHeight();  
         float roundPx;  
         float left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;  
         if (width <= height) {  
              roundPx = width / 2;  
              top = 0;  
              left = 0;  
              bottom = width;  
              right = width;  
              height = width;  
              dst_left = 0;  
              dst_top = 0;  
              dst_right = width;  
              dst_bottom = width;  
          } else {  
              roundPx = height / 2;  
              float clip = (width - height) / 2;  
              left = clip;  
              right = width - clip;  
              top = 0;  
              bottom = height;  
              width = height;  
              dst_left = 0;  
              dst_top = 0;  
              dst_right = height;  
              dst_bottom = height;  
         }  
  
            Bitmap output = Bitmap.createBitmap(width,height, Config.ARGB_8888);  
            Canvas canvas = new Canvas(output);  
              
            final int color = 0xff424242;  
            final Paint paint = new Paint();  
            final Rect src = new Rect((int)left, (int)top, (int)right, (int)bottom);  
            final Rect dst = new Rect((int)dst_left, (int)dst_top, (int)dst_right, (int)dst_bottom);  
            final RectF rectF = new RectF(dst);  
  
            paint.setAntiAlias(true);  
 
            canvas.drawARGB(0, 0, 0, 0);  
            paint.setColor(Color.WHITE);  
            paint.setStrokeWidth(4);   
            canvas.drawRoundRect(rectF, roundPx, roundPx, paint);  
            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  
            canvas.drawBitmap(bitmap, src, dst, paint);  
            return output ;   
}

5、根據(jù)圖片uri返回bitmap；此緩存位置為內(nèi)存

public static Bitmap getBitmapUtils(String imgUri){  
    return imageLoader.getMemoryCache().get(imgUri);  
 }

6、根據(jù)圖片uri返回File；此緩存位置為sd卡

public static File getFileUtils(String imgUri){  
    return imageLoader.getDiskCache().get(imgUri);  
}

7、獲取imageloader緩存所有圖片總計(jì)大小

public static long getCacheFileSize(){  
    File disCacheFile = imageLoader.getDiskCache().getDirectory();  
    long size = 0;  
    for(int i=0; i<disCacheFile.listFiles().length; i++){  
        size += disCacheFile.listFiles()[i].length();  
              }  
 return size;  
}

8、清除圖片緩存

public static void clearImageCache(){  
    imageLoader.clearDiskCache();//清除磁盤緩存  
    imageLoader.clearMemoryCache();//清除內(nèi)存緩存  
}