ListFragment的onCreateView（）如何强制调用？

Question

我正在使用android示例应用程序FragmentPagerSupport.java来实现页面之间的幻灯片效果。每个页面都包含一个由线程加载的HTTP图像。我的片段的onCreateView（）正在为图像加载东西。现在我的问题是，我不知道如何将加载的图像位图绘制到在onCreateView中创建的ImageView，任何强制Fragment的onCreateView被调用的想法？

 @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.fragment_pager_list, container, false); 
     View tv = v.findViewById(R.id.text); 
     ((TextView)tv).setText("第 #" + mNum + " 篇"); 
     ImageView iv = (ImageView)v.findViewById(R.id.imageView); 
     final String pic = FragmentPagerSupport.items.get(mNum).thumb; 
     Log.e("tag ", "on create view on"); 
     MyItem mi = FragmentPagerSupport.items.get(mNum); 
     if (mi.bm != null) { 
      Log.e("tag", "setbitmap for " + mNum); 
      iv.setImageBitmap(mi.bm); 
     } else { 
      new Thread(new Runnable() { 
       public void run() { 
        int m = mNum; 
        final Bitmap bm = loadBitmap(pic); 
        MyItem mi = FragmentPagerSupport.items.get(m); 
        mi.bm = bm;     
        Log.e("tab", "finishing load bitmap for " + m); 
        // here I want the bitmap can be drawn to the ImageView which is inside the fragment. 
       } 
      }).start(); 
     } 

     return v; 
    } 

Answer 1

你可以使用这个类的AsyncTask：

public class DownloadImageTask extends AsyncTask<String, Void, Bitmap> { 
ImageView bmImage; 

public DownloadImageTask(ImageView bmImage) { 
    this.bmImage = bmImage; 
} 

protected Bitmap doInBackground(Strings... args) { 
    Bitmap mIcon11 = null; 
       int m = Integer.parse(args[0]); 
       String pic = args[1]; 
    try { 
       final Bitmap bm = loadBitmap(pic); 
       MyItem mi = FragmentPagerSupport.items.get(m); 
       mi.bm = bm;     
       Log.e("tab", "finishing load bitmap for " + m); 
    } catch (Exception e) { 
     Log.e("Error", e.getMessage()); 
     e.printStackTrace(); 
    } 
    return mIcon11; 
} 

protected void onPostExecute(Bitmap result) { 
    bmImage.setImageBitmap(result); 
} 
} 

和使用：

new DownloadImageTask(iv).execute(mNum.toString(),pic);