>From the description of ContentProvider class "A content provider is
only required if you need to share data between multiple applications.
For example, the contacts data is used by multiple applications and
must be stored in a content provider. If you don't need to share data
amongst multiple applications you can use a database directly via
SQLiteDatabase."
I decided to use database directly, because there is no need to share
data with other applications. Also it looked like a simpler approach
for complex queries with complex constraints and joins.
There are few moments that I cannot figure out.
1. How properly notify about deleted item.
2. How properly notify about inserted item.
ListActivity creates cursor which is managed by that activity. There
is also corresponding list adapter.
public class MyActivity extends ListActivity {
public void onCreate(Bundle icicle) {
mCursor = ...;
this.startManagingCursor(mCursor);
ResourceCursorAdapter adapter = new
ResourceCursorAdapter(this, R.layout.mylayout, mCursor) {
public void bindView(View view, Context context, Cursor
cursor) {
...
}
}
setListAdapter(adapter);
}
When another activity is invoked to edit the selected item -
everything is fine. The same item remains selected (even if it changes
position in the list due to the modification of its attributes that
are used for sorting) and it shows the recent values in the list.
The following method of the same list adapter is executed to delete an
item
private void deleteSelectedItem() {
SQLiteDatabase db = ...
db.delete("MyTable", "_id = ?", new String[]
{String.valueOf(getSelectedItemId())});
// FIXME: How to notify the ListAdapter about the change?
}
I tried to execute mCursor.requery() as a mean of notification. It
forces the list to be updated, but all items are shown as not
highlighted. I can see the following sequence of actions in UI - list
is redrawn without deleted item, the next item is shown highlighted,
then next item is shown as not highlighted. When up or down key is
clicked - item is highlighted again, so for the list adapter the
deleted item is still a selected item.
The problem with inserted item is similar, but slightly more complex.
The item is created in another activity (do not want to make it sub-
activity, because there is nothing to return, if notification works).
The next item must be shown highlighted, so somehow list must be
notified about new item id and new selection. The position of a new
item in the list depends on attribute values, created for that item,
so the list view must be scrolled automatically to make a new item
visible when list activity becomes active again.
I am afraid it's too late for me to switch to content provider
implementation to make it work.
Any help?
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