Android Programming Tutorials

The Restaurant Store

Step #7: Change our Adapter and Wrapper......................................

Of course, our existing RestaurantAdapter extends ArrayAdapter and cannot

use a Cursor very effectively. So, we need to change our RestaurantAdapter

into something that can use a Cursor...such as a CursorAdapter. Just as an

ArrayAdapter creates a View for every needed item in an array or List,

CursorAdapter creates a View for every needed row in a Cursor.

A CursorAdapter does not use getView(), but rather bindView() and

newView(). The newView() method handles the case where we need to inflate

a new row; bindView() is when we are recycling an existing row. So, our

current getView() logic needs to be split between bindView() and newView().

Replace our existing RestaurantAdapter implementation in LunchList with

the following:

class RestaurantAdapter extends CursorAdapter {

RestaurantAdapter(Cursor c) {

super(LunchList.this, c);

}

@Override

public void bindView(View row, Context ctxt,

Cursor c) {

RestaurantHolder holder=(RestaurantHolder)row.getTag();

holder.populateFrom(c, helper);

}

@Override

public View newView(Context ctxt, Cursor c,

ViewGroup parent) {

LayoutInflater inflater=getLayoutInflater();

View row=inflater.inflate(R.layout.row, parent, false);

RestaurantHolder holder=new RestaurantHolder(row);

row.setTag(holder);

return(row);

}

}

Then, you need to make use of this refined adapter, by changing the model

in LunchList from an ArrayList to a Cursor. After you have changed that data

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