Android

Question

Android 开发相当陌生，我有一个问题。

我有一个带有 TextView 的 ListView。我有一个 ArrayAdapter，我要在单击按钮时删除一个 ListItem。在我的 ListActivity 中，我将 id 分配给 ListItems，问题是当我删除 ListItem 时，以下 ListItem 继承了它的 id。

即：

假设我有 2 个 ListItems：ListItem0 with id 0, ListItem 1，ID 为 1。 ==> 如果我删除 ListItem0 那么 ListItem1 将获得 id 0

基本上有什么方法可以保留 ListItem ID，即使我删除了其中一些？

后期编辑： 通过从 idList 中删除 id 解决：

idList.remove(position)

public void displayL() {
         Cursor c = mDbAdapter.fetchAllReminders();
         numberList.clear();
         idList.clear();
         startManagingCursor(c);
          c.moveToFirst();
          if (c .moveToFirst()) {
                while (c.isAfterLast() == false) {
                    id= c.getString(c.getColumnIndex(RemindersDbAdapter.KEY_ROWID));
                    String name = c.getString(c.getColumnIndex(RemindersDbAdapter.KEY_TITLE));
                      numberList.add(name);
                      idList.add(id);
                    c.moveToNext();
                }
            }

        adapter = new ItemAdapter(this, R.layout.row, numberList, idList);
        setListAdapter(adapter);
        adapter.notifyDataSetChanged();
    }

适配器class:

public class ItemAdapter extends ArrayAdapter<String>  {
private   ArrayList<String> idList = null;
private ArrayList<String> numberList;
private ImageView delete_entry;
public RemindersDbAdapter mDbAdapter;
public View v;
public  ArrayList<String> clickId;
private long positionId;


public ItemAdapter(Context context, int textViewResourceId, ArrayList<String> numberList,
               ArrayList<String> clickPosition) {
    super(context, textViewResourceId, numberList);
    this.numberList = numberList;
    clickId = clickPosition;
}

@Override
    public int getPosition(String item) {
    return super.getPosition(item);
}

@Override
    public long getItemId(int position) {
    return super.getItemId(position);
}

public View getView(final int position, View convertView, ViewGroup parent){
    v = convertView;
    if (v == null) {
    LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    v = inflater.inflate(R.layout.row, null);
}

mDbAdapter= new RemindersDbAdapter(v.getContext());
final String number = numberList.get(position);
mDbAdapter.open();

if (number != null) {
    final TextView tt = (TextView) v.findViewById(R.id.text_number);
    tt.setTextColor(Color.parseColor("#ffffff"));
    delete_entry = (ImageView) v.findViewById(R.id.delete_entry);
    tt.setText(number);
    delete_entry.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            positionId = Integer.parseInt(clickId.get(position));

            if(position>=0) {
                Log.d("Delete--", "DELETING ID #" + positionId);
                Boolean b =  mDbAdapter.deleteReminder(positionId); //delete from database
                numberList.remove(number); //remove listItem
                notifyDataSetChanged();

            }
            mDbAdapter.close();
        }
    });
}
return v;

}

Answer 1

当您从 numberList 中删除数字时，您似乎并没有从 idList 中删除 id，因此看起来它是被继承的。试试这个。

    public void onClick(View v) {
        positionId = Integer.parseInt(clickId.get(position));

        if(position>=0) {
            Log.d("Delete--", "DELETING ID #" + positionId);
            Boolean b =  mDbAdapter.deleteReminder(positionId); //delete from database
            numberList.remove(number); //remove listItem
            idList.remove(position);
            notifyDataSetChanged();

        }
        mDbAdapter.close();
    }

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