Question

在我的主页面中，我正在调用AsyncTask，它是自己的类。

new DownloadFileAsync(context, icon, resultp.get(PublicProfilePage.REVIEWCREATORFBOOKID),"300").execute();

下面是我的AsyncTask。我正在读JSON试图获取图像的URL。一旦我捕获了该URL，我就使用ImageLoader对其进行缓存，但它不起作用。

public class DownloadFileAsync extends AsyncTask<Void, Void, String> {

//private Context context;
CircularImageView bmImage;
ImageLoader imageLoader;
String fbook_id;
String jsonobject;
String image_size;
String size_url;

public DownloadFileAsync(Context context, CircularImageView bmImage, String fbook_id, String size) 
{
//this.context = context;
this.bmImage = bmImage;
this.fbook_id = fbook_id;
this.image_size = size;

//Image Loader Initialization
imageLoader = new ImageLoader(context);

if(image_size.equalsIgnoreCase("150")) {
    size_url = "https://graph.facebook.com/v2.1/" + fbook_id + "/picture?redirect=0&height=150&width=150";
}else if(image_size.equalsIgnoreCase("300")) {
    size_url = "https://graph.facebook.com/v2.1/" + fbook_id + "/picture?redirect=0&height=300&width=300";
}
}


protected String doInBackground(Void... urls) {
    String result = null;
    String queryResponse = null;
    String resultTwo = null;

        // Create a new HttpClient and Post Header
        HttpClient httpclientBankCheck = new DefaultHttpClient();
        HttpGet httppostBankCheck = new HttpGet(size_url);

        try {
            // Execute HTTP Post Request
            HttpResponse responseBankCheck = httpclientBankCheck.execute(httppostBankCheck);
            HttpEntity responseText = responseBankCheck.getEntity();
            queryResponse = EntityUtils.toString(responseText);             

            // Retrive JSON Objects from the given website URL in
            // JSONfunctions.class
            jsonobject = queryResponse;

            // Locate the array name
            JSONObject arr = new JSONObject(jsonobject);

            result = arr.getString("data");

            JSONObject arrTwo = new JSONObject(result);

            resultTwo = arrTwo.getString("url");

        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
        } catch (IOException e) {
            // TODO Auto-generated catch block
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    return resultTwo;

}

protected void onPostExecute(String resultTwo) {
    //bmImage.setImageBitmap(result);

    imageLoader.DisplayImage(resultTwo, bmImage);

}



}

如果我将URL硬编码到主页面内的ImageLoader中，它确实有效。问题是我正在使用带有ImageLoader的AsyncTask吗？它不应该是对的吗？

非常感谢帮助！

-M

带有AsyncTask的图像加载器

0 个答案: