filtering dialog items in onPrepareDialog()

by greg » Tue, 11 Aug 2009 04:35:16 GMT


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 My application has a ListView displaying some items that are
associated with different documents:

// arrays.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="select_doc_dialog_items">
        <item>doc type A</item>
        <item>doc type B</item>
        <item>doc type C</item>
        <item>doc type D</item>
    </string-array>
</resources>

The ListView implements an OnItemLongClickListener and displays the
available document types as follows:

        public boolean onItemLongClick(AdapterView<?> av, View v, int
position, long id) {
            mPositionActive = position;
            mListView.invalidate();  // TODO: increase efficiency by reducing
invalidate to one item

            if ((position%10) < 4) {
                Toast.makeText(this, "long click position " + position " has
docs",
                                Toast.LENGTH_SHORT).show();
            showDialog(DIALOG_DOCS_AVAILABLE);
            }
            else
                Toast.makeText(this, "long click position " + position + " has
no docs",
                                Toast.LENGTH_SHORT).show();

            return true;
        }

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DIALOG_DOCS_AVAILABLE:
            return new AlertDialog.Builder(this)
                .setTitle(R.string.select_doc_dialog)
                .setItems(R.array.select_doc_dialog_items, new
DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int
which) {

                        /* User clicked so do some stuff */
                        String[] items = getResources().getStringArray
(R.array.select_doc_dialog_items);
                        Toast.makeText(List15.this, "You selected: " + which
+ " , " + items[which],
                                        Toast.LENGTH_SHORT).show();
                    }
                })
                .create();
        }
        return null;
    }

    @Override
    protected void onPrepareDialog(int id, Dialog dialog) {
        super.onPrepareDialog(id, dialog);
        Toast.makeText(List15.this, "onPrepareDialog id: " + id,
Toast.LENGTH_SHORT).show();
    }

- - -

I would like to modify onPrepareDialog to filter the dialog to display
only the document types relevant for the long clicked item (like a
context menu except that some long clicks will perform a different
task: expand or collapse the hierarchy displayed in the custom
ListView).  For example, if an item is long clicked that is associated
with only document types A and B, I would like the dialog to avoid
displaying document types C and D as dialog items?   However, looking
at R.java, it is not clear to me what the id of an individual item in
the select_doc_dialog_items array would be.

Anyone have any tips on how to use onPrepareDialog() to filter
displayed dialog items?

Thanks and best regards,
Greg

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filtering dialog items in onPrepareDialog()

by greg » Tue, 11 Aug 2009 07:44:14 GMT


 fter a little more reading, it seems possible to use the
AlertDialog's getListView() and then hide the unwanted ListView
items. However, an easier path appears to be generating a shortened
list of items during onCreateDialog() and then dismissing it with
removeDialog() ... so the next instance with possibly a different list
will be recreated by onCreateDialog().

On Aug 10, 4:27pm, greg <sep...@eduneer.com> wrote:
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