无法使用异步任务加载从URL图像 [英] Unable to load image from URL by using async task

问题描述

我试图从URL加载图像文本视图，但无法做到这一点，他们是没有错误，进度条也显示，但图像没有加载到图像视图，请大家帮忙，先谢谢了。

我的code ..

1。 XML：

 ＆LT; ImageView的
    机器人：ID =@ + ID / ImageView的
    机器人：layout_width =70dp
    机器人：layout_height =70dp
    机器人：layout_gravity =CENTER_HORIZONTAL
    机器人：layout_marginTop =5DP
     /＆GT;
 

2。 java的code ....

 私有类Load_Product_Image扩展
AsyncTask的＆LT;无效，可绘制，绘制对象＆GT; {     私有对象fetch_image（字符串webaddress）
    抛出MalformedURLException的，IOException异常{
网址URL =新的URL（webaddress）;
对象内容= url.getContent（）;
返回的内容;
}在preExecute保护无效（）{
    super.on preExecute（）;
    progressDialog =新ProgressDialog（getActivity（），ProgressDialog.THEME_TRADITIONAL）;
    progressDialog.setMessage（正在加载...）;
    progressDialog.setIndeterminate（假）;
    progressDialog.setCancelable（假）;
    progressDialog.show（）;
}@覆盖
保护可绘制doInBackground（虚空...... PARAMS）{    InputStream为= NULL;
    尝试{
        为=（InputStream的）this.fetch_image（IMAGE_URL）; //图像URI
                                                        // 地址
                                                        // 得到
                                                        //从
                                                        // previous
                                                        // toplist
                                                        //活动
                                                        //使用
                                                        //意图    }赶上（MalformedURLException的E）{        e.printStackTrace（）;
    }赶上（IOException异常五）{        e.printStackTrace（）;
    }
    可绘制平局= Drawable.createFromStream（是，SRC）;
    回到平局;
}    保护无效onPostExecute（最终可绘制的结果）{
        尝试{
            //显示图片...
            runOnUiThread（新的Runnable（）{
                公共无效的run（）{
                    profile_image.setImageDrawable（结果）;                }
            }）;
            progressDialog.dismiss（）;
        }赶上（例外五）{
            // 没有
        }
    }
 

解决方案

毕加索 允许在您无忧图像加载应用程序经常在code的一行！

  Picasso.with（上下文）.load（http://i.imgur.com/DvpvklR.png）.into（ImageView的）;
 

Android上的图像加载的

许多常见的陷阱是由 毕加索

• 处理ImageView的回收和下载取消在适配器。


• 复杂的图像转换以最小的内存使用。


• 自动内存和磁盘高速缓存。

I am trying to load image from url to text view , but unable to do it, their is no error, progress bar is also appearing ,but image is not loading to image view , please help, thanks in advance

my code..

1. XML :

<ImageView
    android:id="@+id/imageView"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:layout_gravity="center_horizontal"
    android:layout_marginTop="5dp"
     />

2. java code....

private class Load_Product_Image extends
AsyncTask<Void, Drawable, Drawable> {

     private Object fetch_image(String webaddress)
    throws MalformedURLException, IOException {
URL url = new URL(webaddress);
Object content = url.getContent();
return content;
}

protected void onPreExecute() {
    super.onPreExecute();
    progressDialog = new ProgressDialog(getActivity(),ProgressDialog.THEME_TRADITIONAL);
    progressDialog.setMessage("Loading...");
    progressDialog.setIndeterminate(false);
    progressDialog.setCancelable(false);
    progressDialog.show();
}

@Override
protected Drawable doInBackground(Void... params) {

    InputStream is = null;
    try {
        is = (InputStream) this.fetch_image(image_url);// image uri
                                                        // address
                                                        // getting
                                                        // from
                                                        // previous
                                                        // toplist
                                                        // activity
                                                        // using
                                                        // intent

    } catch (MalformedURLException e) {

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

        e.printStackTrace();
    }
    Drawable draw = Drawable.createFromStream(is, "src");
    return draw;
}

    protected void onPostExecute(final Drawable result) {
        try {
            // Display Image...
            runOnUiThread(new Runnable() {
                public void run() {


                    profile_image.setImageDrawable(result);

                }
            });
            progressDialog.dismiss();
        } catch (Exception e) {
            // nothing
        }
    }

解决方案

Picasso allows for hassle-free image loading in your application—often in one line of code!

Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

Many common pitfalls of image loading on Android are handled automatically by Picasso

• Handling ImageView recycling and download cancelation in an adapter.
• Complex image transformations with minimal memory use.
• Automatic memory and disk caching.

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