Android: Binding data from a database to a CheckBox in a ListView?

Question

I'm trying to bind data from my SQLiteDatabase to a ListView. I'm currently using a SimpleCursorAdapter to fill in my ListView. Unfortunately this doesn't seem to work with setting a CheckBox's checked attribute.

This is how I do it now; instead of changing the CheckBox's checked status the adapter is filling in the value to the text argument, so the value is displayed right of the CheckBox as text.

Java:

setListAdapter( new SimpleCursorAdapter( this,
      R.layout.mylist,
      data,
      new String[] { Datenbank.DB_STATE, Datenbank.DB_NAME },
      new int[] { R.id.list_checkbox, R.id.list_text }
    ) );

mylist.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>

<CheckBox android:text=""
    android:id="@+id/list_checkbox"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:checked="false"
    ></CheckBox>

<TextView android:text=""
    android:id="@+id/list_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    ></TextView>

</LinearLayout>

Edit: The field in the database is of course of type boolean and I've also tried to assign an id to the checked field to fill the value in.

Answer 1

You could set a custom SimpleCursorAdapter.ViewBinder:

SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(/* ur stuff */);
cursorAdapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
    public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
        if(columnIndex == 1) {
            CheckBox cb = (CheckBox) view;
            cb.setChecked(cursor.getInt(1) > 0);
            return true;
        }
        return false;
    }
});

The setViewValue method is invoked for every column you specify in the SimpleCursorAdapter constructor and gives you a good place to manipulate some (or all) of the views.

Answer 2

I'm not sure how you would do this aside from creating a custom Adapter that overrode newView/bindView or getView, depending on what you override (ResourceCursorAdapter is a good one).

Ok, so here's an example. I didn't test to see if it would compile because I'm at work, but this should definitely point you in the right direction:

public class MyActivity extends ListActivity {

    MyAdapter mListAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Cursor myCur = null;

        myCur = do_stuff_here_to_obtain_a_cursor_of_query_results();

        mListAdapter = new MyAdapter(MyActivity.this, myCur);
        setListAdapter(mListAdapter);
    }


    private class MyAdapter extends ResourceCursorAdapter {

        public MyAdapter(Context context, Cursor cur) {
            super(context, R.layout.mylist, cur);
        }

        @Override
        public View newView(Context context, Cursor cur, ViewGroup parent) {
            LayoutInflater li = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            return li.inflate(R.layout.mylist, parent, false);
        }

        @Override
        public void bindView(View view, Context context, Cursor cur) {
            TextView tvListText = (TextView)view.findViewById(R.id.list_text);
            CheckBox cbListCheck = (CheckBox)view.findViewById(R.id.list_checkbox);

            tvListText.setText(cur.getString(cur.getColumnIndex(Datenbank.DB_NAME)));
            cbListCheck.setChecked((cur.getInt(cur.getColumnIndex(Datenbank.DB_STATE))==0? false:true))));
        }
    }
}