Not understanding custom cursor adapter

Question

For my application I am using a couple listview. So far have been using simplecursoradapter and works great except for my list view that has a TextView and EditText in the row. I've run into problems that others have had, such as pulling the data from edittext to use in another activity as well as on scroll the text jumps around to different fields due to recycling. After research seems the best way to over come this is to build a custom cursor adapter but I can't wrap my head around how to do this.

public void fillData() {
    Cursor e = mydbhelper.getUserWord();
        startManagingCursor(e);
        String[] from = new String[] {dbadapter.KEY_USERWORD,};
        int[] to = new int[] {R.id.textType,};
       editadapter = new SimpleCursorAdapter(this, R.layout.edit_row, e, from, to);
       ListView list = getListView();
       View footer = getLayoutInflater().inflate(R.layout.footer_layout, list, false);
       list.addFooterView(footer);
       setListAdapter(editadapter);

This is what I use for the activity in question but I can't understand how this would fill into a custom cursor adapter.

Also not sure if this custom adapter should be in a separate class from the rest of my code (like my menu items, edittext validator, onclick events etc.) and call the custom at the start of the class for everything else.

EDIT Was able to figure out what I needed from http://www.vogella.de/articles/AndroidListView/article.html#overview

not sure how I didn't come across it earlier but it helped me build a base to work off of. TY for all the help. I feel like I have ALOT better understand of how custom cursor adapters work.

Answer 1

Creating and using Custom Cursor Adapter is very easy, just extend CursorAdapter class into a class, but as in activity you already extended a class, you cant extend CursorAdapter in Activity Class, so you need to create a new class, but you can create a private class in your Activity Class, so it can use fields of your Activity class too.say CustomCursorAdapter. CursorAdapter class has various method init, which you can extend to achieve your purpose. Like, to change views of your adapter, as is your requirements, override newView(), and bindView(), newView is create a new view(inflate from xml, or by creating new objects), and bindView() is to bind some values to existing views. see an example:

public class ExampleCursorAdapter extends CursorAdapter {
    public ExampleCursorAdapter(Context context, Cursor c) {
        super(context, c);
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        TextView summary = (TextView)view.findViewById(R.id.summary);
        summary.setText(cursor.getString(
                cursor.getColumnIndex(ExampleDB.KEY_EXAMPLE_SUMMARY)));
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(context);
        View v = inflater.inflate(R.layout.item, parent, false);
        bindView(v, context, cursor);
        return v;
    }
}

Answer 2

For

Also not sure if this custom adapter should be in a separate class from the rest of my       code (like my menu items, edittext validator, onclick events etc.) and call the custom at the start of the class for everything else.

Yes, It should be in a separate class.

In your activity,

ListView lv = (ListView)findViewById(R.id.list);

Cursor c = getFromDb();
CustomCursorAdapter adapter = new CustomCursorAdapter(getApplicationContext() , c);
lv.setAdapter(adapter);

Now create the CustomCursorAdapter

public class CustomCursorAdapter extends CursorAdapter {

public CustomCursorAdapter(Context context , Cursor c) {
    super(context,c);

    // TODO Auto-generated constructor stub
}

@Override
public void bindView(View view, Context context, Cursor cursor) {
    // TODO Auto-generated method stub

}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    // TODO Auto-generated method stub

             //Inflate your layout with textview and edittext
             //setText with values from cursor
             //return the view

    return null;
}

}

Answer 3

Try a custom adaptor instead of custom cursor adaptor ...

  public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.addnew);

    ItemsAdapter itemsAdapter = 
        new ItemsAdapter(AddNew.this, R.layout.addnew_typelist_row, types);

    listtype.setAdapter(itemsAdapter);
}

public class ItemsAdapter extends BaseAdapter {
    ArrayList<String> items = new ArrayList<String>();
    String type;
    int color;
    ViewHolder holder;
    Context context;
    int resID;

    public ItemsAdapter(Context context, int resID, ArrayList<String> items) {
        this.items = items;
        this.context = context;
        this.resID=resID;
    }

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

        View v = convertView; 
        TextView name = null ;

        if(convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(context);
            v = inflater.inflate(resID, null);

            holder=new ViewHolder();
            holder.lt = (RelativeLayout)v.findViewById(R.id.ltlistrow);
            holder.name = (TextView)v.findViewById(R.id.desc);

            v.setTag(holder);

        } else {
            holder = (ViewHolder)v.getTag();
            v = convertView;
        }

        String nam = items.get(position);
        if (nam != null) {
            holder.name.setText(items.get(position));
        }

        return v;
    }

    public static class ViewHolder{
        TextView name;
        RelativeLayout lt ;
    }
}

Custom adapter can be in new class or can be a inner class. inflate a layout with the edit text and set it as the list item in the getView. hope it helps