我现在看到您的代码类似于 DownloadRandomPicture.java 中的代码.

I now see that your code is like in DownloadRandomPicture.java.

字符串 fnames [] = null;

String fnames [] = null;

在 doOnBackGround() 中:

In doOnBackGround():

     ArrayList<String> filenames = new ArrayList<String>();

        for (Entry ent: dirent.contents) {
            if (ent.thumbExists) {
                  filenames.add(ent.path);
             }
        }

     fnames = filenames.toArray(new String[filenames.size()]);

在 onPostExecute() 中:

in onPostExecute():

       if ( fnames != null )
        {
            ArrayAdapter<String> array = new ArrayAdapter<String>(mContext, android.R.layout.simple_list_item_1, fnames);

            listView1.setAdapter(array);
        }
       else
            showToast ( "fnames==null" );