FrescoUtils

import android.net.Uri;import android.text.TextUtils;import com.facebook.binaryresource.BinaryResource;import com.facebook.binaryresource.FileBinaryResource;import com.facebook.cache.common.CacheKey;import com.facebook.drawee.backends.pipeline.Fresco;import com.facebook.drawee.backends.pipeline.PipelineDraweeController;import com.facebook.drawee.view.SimpleDraweeView;import com.facebook.imagepipeline.cache.DefaultCacheKeyFactory;import com.facebook.imagepipeline.common.ResizeOptions;import com.facebook.imagepipeline.core.ImagePipeline;import com.facebook.imagepipeline.core.ImagePipelineFactory;import com.facebook.imagepipeline.request.ImageRequest;import com.facebook.imagepipeline.request.ImageRequestBuilder;import java.io.File;/** *  * 判断 图片有没有缓存 */public class FrescoUtils {    public static boolean isImageDownloaded(Uri loadUri) {        if (loadUri == null) {            return false;        }        CacheKey cacheKey = DefaultCacheKeyFactory.getInstance().getEncodedCacheKey(ImageRequest.fromUri(loadUri), null);        return ImagePipelineFactory.getInstance().getMainFileCache().hasKey(cacheKey) || ImagePipelineFactory.getInstance().getSmallImageFileCache().hasKey(cacheKey);    }    //return file or null    public static File getCachedImageOnDisk(Uri loadUri) {        File localFile = null;        if (loadUri != null) {            CacheKey cacheKey = DefaultCacheKeyFactory.getInstance().getEncodedCacheKey(ImageRequest.fromUri(loadUri), null);            if (ImagePipelineFactory.getInstance().getMainFileCache().hasKey(cacheKey)) {                BinaryResource resource = ImagePipelineFactory.getInstance().getMainDiskStorageCache().getResource(cacheKey);                localFile = ((FileBinaryResource) resource).getFile();            } else if (ImagePipelineFactory.getInstance().getSmallImageFileCache().hasKey(cacheKey)) {                BinaryResource resource = ImagePipelineFactory.getInstance().getSmallImageFileCache().getResource(cacheKey);                localFile = ((FileBinaryResource) resource).getFile();            }        }        return localFile;    }    /**     * 清除所有缓存     */    public static void clearCache() {        ImagePipeline imagePipeline = Fresco.getImagePipeline();        imagePipeline.clearMemoryCaches();        imagePipeline.clearDiskCaches();// combines above two lines        imagePipeline.clearCaches();    }    /**     * 清除缓存     *     * @param url     */    public static void clearCache(String url) {        if (TextUtils.isEmpty(url) || "null".equals(url)) return;        Uri uri = Uri.parse(url);        if (isImageDownloaded(uri)) {            ImagePipeline imagePipeline = Fresco.getImagePipeline();            imagePipeline.evictFromMemoryCache(uri);            imagePipeline.evictFromDiskCache(uri);// combines above two lines            imagePipeline.evictFromCache(uri);        }    }    /**     * 设置图片大小     *     * @param view     * @param uri     * @param width     * @param height     */    public static void resizeOptions(SimpleDraweeView view, String uri, int width, int height) {        ImageRequest request = ImageRequestBuilder.newBuilderWithSource(Uri.parse(uri))                .setResizeOptions(new ResizeOptions(width, height))                .build();        PipelineDraweeController controller = (PipelineDraweeController) Fresco.newDraweeControllerBuilder()                .setOldController(view.getController())                .setImageRequest(request)                .build();        view.setController(controller);    }    public static void loadUri(SimpleDraweeView view, String url) {        if (TextUtil.isEmpty(url)) return;        if (view == null) return;        Uri uri = Uri.parse(url);        if (isImageDownloaded(uri)) {            File file = getCachedImageOnDisk(uri);            if (file == null) {                view.setImageURI(Uri.parse(url));            } else {                if (file.exists()) {                    view.setImageURI(Uri.fromFile(file));                } else {                    view.setImageURI(Uri.parse(url));                }            }        }    }}