Android的 - ViewRootImpl $ CalledFromWrongThreadException

问题描述

我是用这个，来显示图像从互联网但它抛出一个错误如下：
04-12 13：45：05.337：E / AndroidRuntime（27897）：android.view.ViewRootImpl $ CalledFromWrongThreadException：所致。只有创建视图层次可以触摸其观点原来的线程

 公共类订单扩展活动{
        @覆盖
        公共无效的onCreate（包savedInstanceState）{
            super.onCreate（savedInstanceState）;
            新DownloadFilesTask（）执行（）。
        }
        私有类DownloadFilesTask扩展的AsyncTask＆LT;虚空，虚空，虚空＆GT; {
            保护无效onPostExecute（无效的结果）{
            }
             @覆盖
             保护无效doInBackground（虚空...... PARAMS）{
                 的setContentView（R.layout.order）;
                    ImageView的ImageView的=（ImageView的）findViewById（R.id.imgView）;
                    imageView.setImageDrawable（createDrawableFromURL（http://savagelook.com/misc/sl_drop2.png））;
                    返回null;
             }
        }
        私人绘制对象createDrawableFromURL（字符串urlString）{
            绘制的图像= NULL;
        尝试 {
            网址URL =新的URL（urlString）;
            InputStream的是=（的InputStream）url.getContent（）;
            图像= Drawable.createFromStream（是，SRC）;
        }赶上（MalformedURLException异常E）{
            图像= NULL;
        }赶上（IOException异常E）{
            图像= NULL;
        }
        返回形象;
        }

}
 

解决方案

将这个在的onCreate（）

 的ImageView ImageView的;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.order）;
        ImageView的=（ImageView的）findViewById（R.id.imgView）;
        新DownloadFilesTask（）执行（）。
    }
 

和您的的AsyncTask 类应该是这样的，

 私有类DownloadFilesTask扩展的AsyncTask＆LT;虚空，虚空，虚空＆GT; {
             绘制对象绘制;

             @覆盖
             保护无效doInBackground（虚空...... PARAMS）{
             绘制= createDrawableFromURL（
                                   http://savagelook.com/misc/sl_drop2.png）;
              返回null;
             }
             保护无效onPostExecute（无效的结果）{
                    imageView.setImageDrawable（绘制）;
            }
        }
 

I was using this, to DISPLAY IMAGES FROM THE INTERNET but it throws an error as below:
04-12 13:45:05.337: E/AndroidRuntime(27897): Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

public class Order extends Activity {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            new DownloadFilesTask().execute();       
        }    
        private class DownloadFilesTask extends AsyncTask<Void, Void, Void> {
            protected void onPostExecute(Void result) {
            }
             @Override
             protected Void doInBackground(Void... params) {
                 setContentView(R.layout.order);
                    ImageView imageView = (ImageView)findViewById(R.id.imgView);  
                    imageView.setImageDrawable(createDrawableFromURL("http://savagelook.com/misc/sl_drop2.png"));
                    return null;
             }          
        }     
        private Drawable createDrawableFromURL(String urlString) {
            Drawable image = null;
        try {
            URL url = new URL(urlString);
            InputStream is = (InputStream)url.getContent();
            image = Drawable.createFromStream(is, "src");
        } catch (MalformedURLException e) {
            image = null;
        } catch (IOException e) {
            image = null;
        } 
        return image;
        }

}

解决方案

Put this in onCreate()

ImageView imageView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.order);
        imageView = (ImageView)findViewById(R.id.imgView);
        new DownloadFilesTask().execute();       
    } 

And your AsyncTask class should be like this,

        private class DownloadFilesTask extends AsyncTask<Void, Void, Void> {
             Drawable drawable;

             @Override
             protected Void doInBackground(Void... params) {
             drawable = createDrawableFromURL(
                                   "http://savagelook.com/misc/sl_drop2.png");
              return null;
             }
             protected void onPostExecute(Void result) {
                    imageView.setImageDrawable(drawable);
            }          
        } 

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