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As with an activity, the main entry point to a content provider is onCreate(). Here, you can do whatever initialization you want. In particular, here is where you should lazyinitialize your data store. For example, if you plan on storing your data in such-and-so directory on an SD card, with an XML file serving as a table of contents, you should check and see if that directory and XML file are there; if not, create them so the rest of your content provider knows they are out there and available for use. Similarly, if you have rewritten your content provider sufficiently to cause the data store to shift structure, you should check to see what structure you have now and adjust it if what you have is out of date. You don t write your own installer program. This means that you have no great way of determining if, when onCreate() is called, this is the first time ever for the content provider, the first time for a new release of a content provider that was upgraded in place, or just a normal startup. For example, here is the onCreate() method for Provider, from the ContentProvider/ConstantsPlus sample application:

In this exercise, you ll create the solution within Visual Studio 2005 that will contain the remaining items. Follow these steps: 1. The first order of business is to open a new instance of Visual Studio 2005. Once Visual Studio 2005 is open, you can see the Start Page screen and any recent projects you have created, as shown in Figure 9-1.

@Override public boolean onCreate() { db=(new DatabaseHelper(getContext())).getWritableDatabase(); return (db == null) false : true; }

For example, here are the lines from the NooYawk activity s onCreate() method that accomplish the latter points: ViewGroup zoom=(ViewGroup)findViewById(R.id.zoom); zoom.addView(map.getZoomControls()); Then, you can manually get the zoom controls to appear by calling displayZoomControls() on your MapView, or they will automatically appear when the user pans the map as seen in Figure 34-1.

Figure 9-1. Opening Visual Studio 2005 2. Select File New Project, as shown in Figure 9-2.

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While that doesn t seem all that special, the magic is in the private DatabaseHelper object, described in 22.

Figure 9-2. Creating a new project 3. After selecting Project, you will see the New Project dialog box. 4. Navigate to the Other Project Types list within the Project Types tree, and choose Visual Studio Solutions. Select Blank Solution from the Templates section located on the right side of the dialog box, as shown in Figure 9-3.

Typically, you will need to control what the map is showing, beyond the zoom level, such as the user s current location, or a location saved with some data in your activity. To change the map s position, call setCenter() on the MapController. This takes a GeoPoint as a parameter. A GeoPoint represents a location, via latitude and longitude. The catch is that the GeoPoint stores latitude and longitude as integers representing the actual latitude and longitude multiplied by 1E6. This saves a bit of memory versus storing a float or double, and it probably speeds up some internal calculations Android needs to do to convert the GeoPoint into a map position. However, it does mean you have to remember to multiply the real world latitude and longitude by 1E6.

5. Now you need to enter two pieces of information. The first piece of information is the name of the solution; enter LittleItalyVineyards. For the second piece of information, browse to the location on your hard drive where you want to set up your solution file and the subsequent source code. Finally, notice that the option Create Directory for Solution is checked. This is the desired option. The New Project dialog box will now look like Figure 9-4.

query()

Figure 9-4. Finalized New Project dialog box 6. Click the OK button to execute and save the new solution file. 7. You can now view the new solution within Solution Explorer in Visual Studio 2005, as shown in Figure 9-5.

As you might expect, the query() method is where your content provider gets details on a query some activity wants to perform. It is up to you to actually process said query.

Just as the Google Maps you use on your full-size computer can display satellite imagery, so too can Android maps. MapView offers toggleSatellite(), which, as the names suggest, toggles on and off the satellite perspective on the area being viewed. You can have the user trigger these via an options menu or, in the case of NooYawk, via keypresses: @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_S) { map.setSatellite(!map.isSatellite()); return(true); } else if (keyCode == KeyEvent.KEYCODE_Z) { map.displayZoomControls(true); return(true); } return(super.onKeyDown(keyCode, event)); }

Figure 9-5. The new solution At this point, you have set up your solution; however, it doesn t contain any projects at this time. But at least you have the foundation of the container that will hold all your source code for the application.

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