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An Overlay subclass can also implement onTap(), to be notified when the user taps on the map, so the overlay can adjust what it draws. For example, in full-size Google Maps, clicking on a push-pin pops up a bubble with information about the business at that pin s location. With onTap(), you can do much the same in Android. The onTap() method for ItemizedOverlay receives the index of the OverlayItem that was clicked. It is up to you to do something worthwhile with this event. In the case of SitesOverlay, as previously shown, onTap() looks like this: @Override protected boolean onTap(int i) { Toast.makeText(NooYawk.this, items.get(i).getSnippet(), Toast.LENGTH_SHORT).show(); return(true); }

Figure 9-11. Creating the subdirectory 7. When prompted to create the new folder, click the Yes button. The new subdirectory will be created, and you will be returned to the Add New Web Site dialog box, which will show the newly selected subdirectory and the full path in which to create the new website, as shown in Figure 9-12.

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The pattern is the same as before: use the provider particulars plus the data to be inserted to actually do the insertion. Note the following regarding the example: You can insert only into a collection Uri, so we validate that by calling isCollectionUri(). The provider also knows which columns are required (getRequiredColumns()), so we iterate over those and confirm our supplied values cover the requirements. The provider is also responsible for filling in any default values (populateDefaultValues()) for columns not supplied in the insert() call and not automatically handled by the SQLite table definition.

Figure 9-12. Finalizing the new website 8. Now that you have entered all the information, click the OK button. The new website will be created with the information you have specified. You can now see the new site located in the Web folder in Solution Explorer, as shown in Figure 9-13.

update()

Here, we just toss up a short Toast with the snippet from the OverlayItem, returning true to indicate we handled the tap.

Figure 9-13. The new website The exercise is now complete, and you have successfully added the web project portion of the Visual Studio 2005 solution.

Your update() method gets the Uri of the instance or collection to change, a ContentValues structure with the new values to apply, a String for a SQL WHERE clause, and a String[] with parameters to use to replace characters found in the WHERE clause. Your responsibility is to identify the instance(s) to be modified (based on the Uri and WHERE clause), and then replace those instances current property values with the ones supplied. This will be annoying, unless you re using SQLite for storage. Then you can pretty much pass all the parameters you received to the update() call to the database, although the update() call will vary slightly depending on whether you are updating one instance or several instances. For example, here is update() from Provider:

Now that you have created the first project within the solution, you cannot stop there; obviously, you will need to expand upon what you have created so far. In this chapter, I will not discuss or demonstrate the exact web forms needed for the case study project. I will discuss

@Override public int update(Uri url, ContentValues values, String where, String[] whereArgs) { int count; if (isCollectionUri(url)) { count=db.update(getTableName(), values, where, whereArgs); } else { String segment=url.getPathSegments().get(1); count=db .update(getTableName(), values, getIdColumnName()+"=" + segment + (!TextUtils.isEmpty(where) " AND (" + where + ')' : ""), whereArgs); } getContext().getContentResolver().notifyChange(url, null); return count; }

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