Question

在我的android应用程序中，我使用扩展ArrayAdapter的适配器在片段中有一个列表。每当您持有行项目很长时间，您可以通过在警报对话框上单击是来删除该行。但是，当您单击是时，似乎删除了最后一行。当您关闭该片段并返回该片段时，视图就可以删除正确的行。经过这么多天的调试后，我无法解决这个问题。任何人都可以搞清楚什么是错的？提前谢谢。

AdapterClass

public class DuasListAdapter extends ArrayAdapter<String> {

    // class variables
        private final Context context;// to save context
        private final List<String> duas;// to save list of stores
        LayoutInflater inflater;// so save layout inflater for the view

        public DuasListAdapter(Context ctx, List<String> duasList) {

            super(ctx, R.layout.adapter_list_duas, duasList);
            context = ctx;// save context
            duas = duasList;// save list of stores
            inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);// save inflater layout
        }



    @Override
        public View getView(int position, View convertView, ViewGroup parent) {



            ViewHolder holder;
            // if view is not loaded
            if (!(convertView instanceof View)) {
                convertView = inflater.inflate(R.layout.adapter_list_duas, parent, false);
                // load the view from holder class
                holder = new ViewHolder(convertView);
                // set the tag for future use
                convertView.setTag(holder);
            }
            // if view is loaded
            else
                // get view from tag
                holder = (ViewHolder) convertView.getTag();

            holder.duaIndex = position;

convertView.setOnLongClickListener(new OnLongClickListener() {

                    @Override
                    public boolean onLongClick(View v) {
                        final View view = v;
                        DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                switch (which) {
                                    case DialogInterface.BUTTON_POSITIVE:
                                        ViewHolder holder = (ViewHolder) view.getTag();
                                        int index = holder.duaIndex;
                                        ((MainActivity) context).removeItemFromList(index);
                                        Toast.makeText(view.getContext(), "Deleted", Toast.LENGTH_LONG).show();
                                        break;

                                    case DialogInterface.BUTTON_NEGATIVE:
                                        // No button clicked
                                        break;
                                }
                            }
                        };

                        AlertDialog.Builder builder = new AlertDialog.Builder(context);
                        builder.setMessage("Delete Dua from Favorites?").setPositiveButton("Yes", dialogClickListener).setNegativeButton("No", dialogClickListener).show();

                        return false;
                    }
                });
return convertView;
        }

ListFragment

public void removeItemFromList(int index) {
        String verses = new SharedPreferencesSupplication().read(SingletonClass.keyListOfVerses, "a1");
        String[] versesList = verses.split(",");
        String identifier = versesList[index];
        new FavoriteDuas().removeDua(identifier);
        updatedData();
    }

    @Override
    public void onResume() {
        lvDuaas.setAdapter(duasAdapter);
        updatedData();
        super.onResume();
    }

    @Override
    public void onPause() {
        // TODO Auto-generated method stub
        lvDuaas.setAdapter(duasAdapter);
        updatedData();
        super.onPause();
    }

    public void updatedData() {
        boolean keyIsFavSel = new SharedPreferencesSupplication().read(SingletonClass.keyIsFavSelected, false);
        if (keyIsFavSel)
            new SharedPreferencesSupplication().save(SingletonClass.keyListOfVerses, new SharedPreferencesSupplication().read(SingletonClass.keyFavVerses, "a1"));
        String verses = new SharedPreferencesSupplication().read(SingletonClass.keyListOfVerses, "a1");
        String[] versesList = verses.split(",");
        ArrayList<String> duas = new ArrayList<String>();
        for (int i = 0; i < versesList.length; i++) {
            if (versesList[i].length() > 0)
                duas.add(versesList[i]);
        }

        duasAdapter.clear();

        if (duas.size() > 0) {

            for (String object : duas) {

                duasAdapter.insert(object, duasAdapter.getCount());
            }
        }

        duasAdapter.notifyDataSetChanged();


    }

删除-方法

public void removeDua(String duaIdentifier) {
        String verses = new SharedPreferencesSupplication().read(SingletonClass.keyFavVerses, "");
        String[] versesList = verses.split(",");
        int indexFound = -1;
        for (int i = 0; i < versesList.length; i++) {
            if (versesList[i].equals(duaIdentifier)) {
                indexFound = i;
                break;
            }
        }
        if (indexFound >= 0) {
            verses = "";
            for (int i = 0; i < versesList.length; i++) {
                if (indexFound != i) {
                    if (verses.isEmpty())
                        verses = versesList[i];
                    else
                        verses = verses + "," + versesList[i];
                }
            }
            new SharedPreferencesSupplication().save(SingletonClass.keyFavVerses, verses);

        }
    }

Answer 1

您可以尝试重新实例化duasAdapter

duasAdapter = new DuasListAdapter(your_context_here, duas);

而不是

duasAdapter.clear();

            if (duas.size() > 0) {

                for (String object : duas) {

                    duasAdapter.insert(object, duasAdapter.getCount());
                }
            }

            duasAdapter.notifyDataSetChanged();

Answer 2

您在视图上使用setOnLongClickListener（），而是使用setOnItemLongClickListener（）。

Android ListAdapter删除后不立即刷新

2 个答案: