Question

EDITED

我正在处理联系人列表并尝试实施分段列表视图。当应用程序启动时，只有一个Header（Section）在重复一些项目后开始显示自己，并在向上/向下滚动时改变其位置。

这是我的代码：

    private class MySimpleCursorAdapter extends SimpleCursorAdapter {

         Holder holder = null;
         LayoutInflater layoutInflater;
//       String keyWord = "empty";

        public MySimpleCursorAdapter(Context context, int layout, Cursor cur,
                String[] from, int[] to, int flag) {
            super(context, layout, cur, from, to, flag);
        }

        public String getTitle(String contName) {
            return contName.substring(0, 1);
         }

        @Override
        public View newView(Context context, Cursor mCursor, ViewGroup parent) {
            holder = new Holder();
            layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            String cont_Name = mCursor.getString(mCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
            View view = null;

                    if ( ! keyWord.equalsIgnoreCase(getTitle(cont_Name))  || keyWord.equals(null))
                    {
                        view = layoutInflater.inflate(R.layout.section_header, null);
                        TextView sectionTitle = (TextView) view.findViewById(R.id.title2);
                        sectionTitle.setText(getTitle(cont_Name));
                        keyWord = getTitle(cont_Name);
                        Log.d("KeyWord", keyWord);
                        Log.d("Contact Name", cont_Name);

                    }
                    else if(keyWord.equalsIgnoreCase(getTitle(cont_Name))) {

                        view = layoutInflater.inflate(R.layout.pm_fragment, null);

                        holder.contactTitle= (TextView)view.findViewById(R.id.textView1);
                        holder.contactDetail = (TextView)view.findViewById(R.id.textView2);

                        holder.contactTitle.setText(mCursor.getString(mCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)));
                        holder.contactDetail.setText(mCursor.getString(mCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));

                        Log.d("KeyWord", keyWord);
                        Log.d("Contact Name", cont_Name);

                        String contactId_String = ""+mCursor.getString(mCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone._ID));
                        long contactId = Long.parseLong(mCursor.getString(mCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone._ID)));

                        DatabaseHandler handler = new DatabaseHandler(getActivity());
                        Contact matchedContact = handler.getContact(contactId) ;
                        String dbContactId= "";
                        if(matchedContact != null){

                            if(matchedContact.getID() != 0 && ""+matchedContact.getID() != null){
                                dbContactId= ""+matchedContact.getID();
                            }

                            if(dbContactId.equals(contactId_String)){
                                holder.myImage = (ImageView) view.findViewById(R.id.imageView1);          
                                holder.myImage.getLayoutParams().height = 100;
                                holder.myImage.getLayoutParams().width = 100;
                                holder.myImage.setBackgroundResource(R.drawable.person_empty_online);
                            }
                        }else{
                            holder.myImage = (ImageView) view.findViewById(R.id.imageView1);          
                            holder.myImage.getLayoutParams().height = 100;
                            holder.myImage.getLayoutParams().width = 100;
                            holder.myImage.setBackgroundResource(R.drawable.person_empty_offline);
                        }
                        handler.close();
                        keyWord = getTitle(cont_Name);
                    }
            return view;
        }

    }

在调试期间，在结束行return view ;之后，它进入CursorAdapter.class并通过以下行传递：

if (!mCursor.moveToPosition(position)) {
  throw new IllegalStateException("couldn't move cursor to position " + position);
}

并输入if condtion，但应用不会崩溃。

Answer 1

最后两周后得到了我自己的答案......我的if-else条件过于复杂，所以我根据一些不同的标准进行比较。

if (mCursor.getPosition() > 0 && mCursor.moveToPrevious()) 
            {
                preName = mCursor.getString(mCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                mCursor.moveToNext();
            }
            else if(mCursor.getPosition() == 0)
            {
                preName = null;
            }
            else{
                preName = null;
            }

            if(preName != null){
                preTitle = getTitle(preName);
            }

//===============================================================================
            /*          
             * Setting Header And Contact Details
             */
//===============================================================================

            if(mCursor.isFirst()){
                holder.titleText.setVisibility(View.VISIBLE);
                holder.titleText.setText(itemTitle);
            }

            else if(preName != null){

                if(! itemTitle.equalsIgnoreCase(preTitle))
                {
                    holder.titleText.setVisibility(View.VISIBLE);
                    holder.titleText.setText(itemTitle);
                }else{
                    holder.titleText.setVisibility(View.GONE);
                }
            }

            holder.contactTitle.setText(mCursor.getString(mCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)));
            holder.contactDetail.setText(mCursor.getString(mCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));

ListView在使用SimpleCursorAdapter时没有显示正确的Sections

1 个答案: