[問題] DialogFragment+BaseAdapter+AsyncTask

[comteken ([CR])]

public class CustomAdapter extends BaseAdapter {
        private static final String TAG = "CustomAdapter";
        ArrayList<Bitmap> _bitmapList;
        LayoutInflater inflater;

        public CustomAdapter(Context context) {
                _bitmapList = new ArrayList<Bitmap>();
                inflater = LayoutInflater.from(context);
        }

        public void addBitmap(Bitmap bitmap) {
                try {
                        _bitmapList.add(bitmap);
                        Log.d(TAG, "_bitmapList.size() = " + _bitmapList.size());
                } catch (Exception e) {
                        Log.e(TAG, e.toString());
                }
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
                ViewHolder viewHolder = new ViewHolder();
                if (convertView == null) {
                        convertView = inflater.inflate(
                                        R.layout.custom_adapter_listview_item, null);

                        viewHolder.iv = (ImageView) convertView
                                        .findViewById(R.id.custom_adapter_listview_item_imageView);
                        convertView.setTag(viewHolder);
                } else {
                        viewHolder.iv = (ImageView) convertView.getTag();
                }
                viewHolder.iv.setImageBitmap(_bitmapList.get(position));

                return convertView;
        }

        class ViewHolder {
                ImageView iv;
        }

}


public class MorePhotoDialog extends DialogFragment {
        private static final String TAG = "MorePhotoDialog";
        private CustomAdapter _customAdapter;
        private Context _context;
        private ListView _listView;

        public MorePhotoDialog(Context context) {
                Log.d(TAG, "new MorePhotoDialog");
                _customAdapter = new CustomAdapter(context);
                _context = context;
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
                LayoutInflater inflater = getActivity().getLayoutInflater();
                View view = inflater.inflate(R.layout.custom_adapter, null);

                _listView = (ListView) view.findViewById(R.id.custom_adapter_listView);
                _listView.setAdapter(_customAdapter);

                AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                builder.setView(view);
                builder.setTitle(R.string.more_photo_dialog_more);

                return builder.create();
        }

        public void addImageLoaderTask(String... urls) {

                ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
                // Log.d(TAG, "imageLoaderTask.execute: " + urls[i]);
                imageLoaderTask.execute(urls);

        }

        private class ImageLoaderTask extends AsyncTask<String, Void, Bitmap[]> {
                // private class ImageLoaderTask extends AsyncTask<String, Void, Void> {

                @Override
                protected Bitmap[] doInBackground(String... url) {
                        // protected Void doInBackground(String... url) {

                        Bitmap[] bitmaps = new Bitmap[url.length];
                        for (int i = 0; i < url.length - 1; i++) {
                                String imgUrl = url[i];
                                Log.w(TAG, "url[0] = " + url[i]);

                                // Getting Caching directory
                                File cacheDirectory = _context.getCacheDir();

                                // Temporary file to store the downloaded image
                                File tmpFile = new File(cacheDirectory.getPath(),
                                                FunctionUtility.getLastString(imgUrl));

                                Log.d(TAG, "imgUrl(" + tmpFile.getName() + ") = " + imgUrl);
                                if (!tmpFile.exists()) {
                                        Log.w(TAG, tmpFile.getPath() + " not exists");
                                        BitmapFuntions.downloadBitmapFromUrl(imgUrl, tmpFile);
                                }
                                // Load bitmap and put in adapter
                                bitmaps[i] = BitmapFuntions.decodeFile(tmpFile, 300, 200);

                                // Show Logs
                                Log.d(TAG,
                                                "bitmap.getByteCount() = " + bitmaps[i].getByteCount());
                                Log.d(TAG, tmpFile.getPath());
                                Log.d(TAG, tmpFile.getName() + " = " + tmpFile.length() / 1024
                                                + " Kb");
                                Log.d(TAG, "imageLoaderTask.execute: " + url[i]);
                        }

                        return bitmaps;
                }

                @Override
                protected void onPostExecute(Bitmap[] result) {

                        try {

                                Log.d(TAG, "onPostExecute");

                                for (int i = 0; i < result.length; i++) {
                                        _customAdapter.addBitmap(result[i]);
                                }
//                              _customAdapter.notifyDataSetChanged();

                        } catch (Exception e) {
                                Log.e(TAG, e.toString());
                        }
                }
}


不知道為什麼用了 _customAdapter.notifyDataSetChanged();
這一行，就crash了..
在加了這行之前都沒有問題
還是有別的方式可以更新UI嗎?

希望有大大可以幫小弟解答一下>"<


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推 givemepass:Log是?

07-24 10:21:24.740: E/AndroidRuntime(20656): java.lang.ClassCastException:
com.gundam.cool.component.CustomAdapter$ViewHolder cannot be cast to
android.widget.ImageView
※ 編輯: comteken (114.36.155.148), 07/24/2014 22:25:18
推 givemepass:訊息就是為什麼了!
ViewHolder 不能這樣用嗎
直接用ImageView 是可以過的0.0
※ 編輯: comteken (114.36.155.148), 07/24/2014 22:32:31
推 kewang:你的tag是存ViewHolder，可是你getTag的時候卻是casting成
→ kewang:ImageView，你不覺得哪些有問題嗎？
恩，腦袋突然卡住了，po上來之後就通惹0.0
※ 編輯: comteken (114.36.155.148), 07/25/2014 03:06:55