Here is what I ended up with. Do you guys care to grade this on an A
to F scale. I'm all of a sudden wondering when the startManagingCursor
(c); is going to slam my cursor shut, rendering this code broken. I
guess I could always read the Cursor into an Array and use that for my
adapter. When does the crazy *stop*?
private void preCheck(ListView list) {
// if an entry is in the database, check it
SimpleCursorAdapter adapter = (SimpleCursorAdapter)
list.getAdapter
();
int rows = adapter.getCount();
for (int i = 0; i < rows; i++) {
adapter.getCursor().moveToPosition(i);
String clickedPK = adapter.getCursor().getString(0);
Log.d("preCheck()", clickedPK);
if (keyInStupidExtraDataBase()) {
list.setItemChecked(2, true);
}
}
}
On Oct 27, 5:00 pm, stanlick <[email protected]> wrote:
> Thanks brothers --
>
> I like the idea of the selected state of the data being in the
> adapter, however, I'm not too excited about all the custom code for
> such an obvious requirement! I am using a ListActivity subclass
> configured as follows:
>
> setListAdapter(buildNameAdapter());
> ListView list = getListView();
> list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
> list.setOnItemClickListener(this);
> preCheck(list);
>
> The adapter is a SimpleCursorAdapter instantiated as follows
>
> private ListAdapter buildNameAdapter() {
> String[] PROJECTION = new String[] { Contacts.People._ID,
> Contacts.PeopleColumns.NAME };
> Cursor c = managedQuery(Contacts.People.CONTENT_URI,
> PROJECTION,
> null,
> null, Contacts.People.DEFAULT_SORT_ORDER);
>
> startManagingCursor(c);
> adapter = new SimpleCursorAdapter(this,
>
> android.R.layout.simple_list_item_multiple_choice, c,
> new String[] { Contacts.PeopleColumns.NAME },
> new int[] { android.R.id.text1 });
> return adapter;
> }
>
> Where I stuck the adapter in the list and thought life would be good.
> Now I am sitting here with my cursor blinking in the preCheck(...)
> method wondering what the hell to do to have an entry(s) pre-checked!
> It appears I can either loop through the adapter/list and manipulate
> the list view (as per Mark) or muck around with the Cursor in order to
> add a SelectableString custom type to the adapter *and* override
> callback methods to check the entries which have their
> (selectableString.isSelected()==true values. The basic idea of
> wanting a list of items either checked/unchecked seems like one where
> none of this hand-coding should be necessary. This all started when I
> was looking for a way to add *one* extra checkbox to the basic contact
> info! Now I'm writing myself a small mountain of code because
> associating a single "extra" element with a contact is harder than
> pulling teeth.
>
> Does it sound like I am disappointed? Didn't we put a man on the
> moon?
>
> P.S. Thanks for the help you guys. Rolling up my sleeves now and
> cracking open a cold brew. Perhaps I'll flip a coin on this one.
>
> Peace,
> Scott
>
> On Oct 27, 10:57 am, Streets Of Boston <[email protected]>
> wrote:
>
> > Put the data whether a checkbox of a list-item is selected inside the
> > *adapter's* data, like my example i gave you in an earlier post
> > (selectableString.isSelected).
>
> > If you want to pre-select a check-box of a list-item, set its
> > corresponding element in the adapter (SelectableString) as selected
> > (selectableString.isSelected = true). Then, if you want to show this
> > on the screen, call notifyDatasetChanged() on your adatper.
>
> > If you implemented your adapter's getView correctly, you'd see the
> > checkbox becoming checked.
> > Example code (won't compile):
>
> > public MyAdapter extends BaseAdapter {
> > private List<SelectableString> mData = new
> > ArrayList<SelectableString>();
> > ...
>
> > // example methods.
> > public void selectSoundTableItem(int position, boolean select) {
> > mData.get(position).isSelected = select;
> > notifyDatasetChanged();
> > }
>
> > public void setSoundData(Map<String,Integer> soundTable) {
> > mData.clear();
> > for (String soundName : soundTable.keySet()) {
> > SelectableString ss = new SelectableString();
> > ss.soundTableName = soundName;
> > ss.soundId = soundTable.get(soundName);
> > mData.add(ss);
> > }
> > notifyDatasetChanged();
> > }
>
> > public void preselectSoundData(SharedPreferences prefs) {
> > String[] selectedSoundsArray =
> > prefs.getString("selectedSounds", "").split(",");
>
> > for (SelectableString ss : mData) {
> > ss.isSelected = false;
> > }
>
> > for (int selI = 0; selI < selectedSoundsArray.length; selI++) {
> > SelectableString ss = findItem(mData,selectedSoundsArray
> > [selI]);
> > ss.isSelected = true;
> > }
> > notifyDatasetChanged();
> > }
>
> > // below are the methods from BaseAdapter you need to implement:
> > // getCount(), getItem(int position), etc.
> > ...
> > public Object getItem(int position) {
> > return mData.get(position);
> > }
> > ...
> > ...
>
> > // Called by your attached ListView when it's about to create/re-
> > use a visible item.
> > // The ListView calls this method. Your code should not call it.
> > public View getView(int position, View convertView, ViewGroup
> > parent) {
> > ... // use convertView or create/inflate a new one when it's
> > null. //
> > ...
>
> > SelectableString ss = (SelectableString)getItem(position);
>
> > // may help you find back the soundTableItem in onClick methods
> > by calling 'getTag()'
> > convertView.setTag(new Integer(ss.soundId));
>
> > String soundName = ss.soundName;
> > TextView tv = (TextView)convertView.findViewById(R.id.textview);
> > tv.setText(soundName);
>
> > boolean isSelected = ss.isSelected;
> > CheckBox cb = (CheckBox)convertView.findViewById(R.id.checkbox);
> > cb.setChecked(isSelected);
>
> > ...
> > ...
>
> > return convertView;
> > }
> > ...
>
> > }
>
> > On Oct 26, 9:38 pm, stanlick <[email protected]> wrote:
>
> > > Thanks Mark --
>
> > > Doesn't this sort of violate the MVC pattern? Moreover, does it seem
> > > odd to you that both the adapter and ListView have methods to cough up
> > > a view? Pre-selecting check boxes is sure becoming a difficult-to-do
> > > process!
>
> > > I am in the debugger and experimenting with how I might get the view
> > > from the list as you suggested.
>
> > > I have tried
>
> > > list.getChildAt(0); which returned null
> > > list.getItemAtPosition(0) which returned
> > > android.content.contentresolver$cursorwrapperin...@4375e088
> > > list.getRootView() which returned
> > > com.android.internal.policy.impl.phonewindow$decorv...@4375ac38
>
> > > Can you throw me another clue?
>
> > > Scott
>
> > > On Oct 25, 4:02 pm, "Mark Murphy" <[email protected]> wrote:
>
> > > > > I am using a SimpleCursorAdapter and having a similar problem with
> > > > > pre-
> > > > > checking certain entries. This is my experimental code that I am
> > > > > trying immediately following the instantiation of the adapter:
>
> > > > > adapter = new SimpleCursorAdapter(this,
> > > > >
> > > > > android.R.layout.simple_list_item_multiple_choice, c,
> > > > > new String[] { Contacts.PeopleColumns.NAME
> > > > > },
> > > > > new int[] { android.R.id.text1 });
>
> > > > > // TODO TEST CODE
> > > > > CheckedTextView cb = (CheckedTextView) adapter.getView(0,
> > > > > null,
> > > > > null);
> > > > > cb.setChecked(true);
>
> > > > > The list appears and the first entry is *not* checked. Any ideas?
>
> > > > The View you got from your getView() call is being discarded.
>
> > > > Remember, *ListView* does the caching of rows. Since your requested a
> > > > row
> > > > outside of ListView, ListView doesn't know about it or use it.
>
> > > > Add your SimpleCursorAdapter to your ListView, then call
> > > > setItemChecked()
> > > > on the ListView to check your desired row, and see if that works.
>
> > > > --
> > > > Mark Murphy (a Commons Guy)http://commonsware.com
> > > > Android App Developer
> > > > Books:http://commonsware.com/books.html-Hidequoted text -
>
> > > - Show quoted text -
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