使用毕加索下载和保存图像

Question

4.使用自定义适配器在ListView中显示图像。

我只是对步骤1和2有问题。我可以从服务器获取新闻，并在我的ListView中显示它们

并通过在我的适配器中添加以下代码显示缓存中的图像：

Picasso.with(context).load(image[position]).into(iv);

@Override
protected void onPostExecute(Void result) {
   SaveImages();
   pDialog.dismiss();
   super.onPostExecute(result);
}

String fileName = null;

public void SaveImages() {
    for(int i = 0; i < image.length; i++) {
        Picasso.with(this).load(image[i]).into(target);
        fileName = "image-" + i + ".jpg";
    }
}

Target target = new Target() {

    @Override
    public void onPrepareLoad(Drawable arg0) {
    }

    @Override
    public void onBitmapLoaded(Bitmap bitmap, LoadedFrom arg1) {
        File file = new File(Environment.getExternalStorageDirectory().getPath() +"/" + fileName);
         try {
             file.createNewFile();
             FileOutputStream ostream = new FileOutputStream(file);
             bitmap.compress(CompressFormat.JPEG, 75, ostream);
             ostream.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
    }

    @Override
    public void onBitmapFailed(Drawable arg0) {
    }
};

Answer 1

尝试将target target定义放在调用picasso.with(this).load(image[i]).into（target）；之前

附言。使用下面的代码和我保存图像非常好。不管怎样，谢谢。

我的代码：

        final String fileName = mDataset.get(i).getAid() + ".jpg";
        Target target = new Target() {

            @Override
            public void onPrepareLoad(Drawable arg0) {
                return;
            }

            @Override
            public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom arg1) {

                try {
                    File file = null;

                    // judge "imgs/.nomedia"'s existance to judge whether path available
                    if(LightCache.testFileExist(GlobalConfig.getFirstStoragePath()
                            + "imgs" + File.separator +".nomedia") == true)
                        file = new File(GlobalConfig.getFirstStoragePath()
                                + "imgs" + File.separator + fileName);

                    else file = new File(GlobalConfig.getSecondStoragePath()
                            + "imgs" + File.separator + fileName);

                    file.createNewFile();
                    FileOutputStream ostream = new FileOutputStream(file);
                    bitmap.compress(Bitmap.CompressFormat.JPEG, 80, ostream);
                    ostream.close();

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

            @Override
            public void onBitmapFailed(Drawable arg0) {
                return;
            }
        };

        Picasso.with(GlobalConfig.getContext())
                .load(Wenku8API.getCoverURL(mDataset.get(i).getAid()))
                .into(target);