如何在Android Universal Image Loader中保存图像？

Question

在Lazy-List我使用此代码和我的图像存储在名为的文件夹中LazyList

ImageLoader imageLoader=new ImageLoader(context); imageLoader.DisplayImage(url, imageView);

但在Universal-Image-Loader我使用这个

 ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext())    
            .build();
    ImageLoader.getInstance().init(config);
    img = (ImageView) this.findViewById(R.id.test_id);
    ImageLoader imageLoader = ImageLoader.getInstance();
    imageLoader.displayImage(URL.RECIPE_IMG_URL,img);

但每次使用互联网来获取图像,并没有我的形象店口ASLO任何文件夹中一次添加.diskCache(new UnlimitedDiscCache(new File("myFolder")))到config ,但没有商店myFolder.任何想法？

Answer 1

您必须保存图像 onLoadingComplete

试试这个,onLoadingComplete你必须保存bitmap到一个变量bitmap

imageLoader.getInstance().displayImage(imagePath, imageView, options, new SimpleImageLoadingListener() {
        @Override
        public void onLoadingStarted(String imageUri, View view) {
            spinner.setVisibility(View.VISIBLE);
        }

        @Override
        public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
            String message = null;
            switch (failReason.getType()) {
            case IO_ERROR:
                message = "Input/Output error";
                break;
            case DECODING_ERROR:
                message = "Image can't be decoded";
                break;
            case NETWORK_DENIED:
                message = "Downloads are denied";
                break;
            case OUT_OF_MEMORY:
                message = "Out Of Memory error";
                break;
            case UNKNOWN:
                message = "Unknown error";
                break;
            }


        }

        @Override
        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {

            showedImgae = loadedImage;

        }
    });

现在的onclick上保存按钮/如果你想保存Bitmap/ Image来SDCard 使用此

 public void downloadImage(){

    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/DCIM/youfoldername");    
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "imagename-"+ n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete (); 
    try {
        FileOutputStream out = new FileOutputStream(file);
        showedImgae.compress(Bitmap.CompressFormat.JPEG, 100, out);
        Toast.makeText(MyActivity.this, "Image Saved", Toast.LENGTH_SHORT).show();
        out.flush();
        out.close();

    } catch (Exception e) {
        e.printStackTrace();
    }

    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    Uri contentUri = Uri.fromFile(file);
    mediaScanIntent.setData(contentUri);
    getApplicationContext().sendBroadcast(mediaScanIntent);
}

希望它可以帮助你..