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This is much more complicated than you might expect because the reason lies in type theory and the calling semantics of exceptions. If it seems like a nonissue, you probably wonder why it is being covered so closely. It is covered because exceptions cannot be polymorphic, and the error messages the compiler generates are largely unhelpful. # class ['a] pexampl(x:'a) = object val d = x method get () = d end;; class ['a] pexampl : 'a -> object val d : 'a method get : unit -> 'a end # let d = new pexampl(10);; val d : int pexampl = <obj> # Now that you have your polymorphic class, you can try to create an exception around it. You cannot do it, however, and the error message is not helpful. # exception Pexp of pexampl;; Characters 18-25: exception Pexp of pexampl;; ^^^^^^^ The type constructor pexampl expects 1 argument(s), but is here applied to 0 argument(s) It is not helpful because even if you supply an argument, the syntax error remains. The error message also doesn t give you any indication of how to fix it. # exception Pexp of (new pexampl(10));; Characters 19-22: exception Pexp of (new pexampl(10));; ^^^ Syntax error # Because you know that exceptions cannot be polymorphic, you can use a typed class and it will work. This exception now works only with integer instances of that class. # exception Pexp of int pexampl;; exception Pexp of int pexampl # raise (Pexp (new pexampl(10)));; Exception: Pexp <obj>. Now that you have defined it, the error message you see if you use the wrong class type is much more helpful.

Our main activity code sets up callbacks on our buttons and the layouts so we can process the touch events (i.e., the MotionEvent objects) for everything in our UI. We ve added lots of logging so you ll be able to tell exactly what s going on as touch events occur. When you compile and run this application, you should see a screen that looks like Figure 16 1. To get the most out of this application, you need to open up LogCat in Eclipse to watch the messages fly by as you touch the touchscreen. This works in the emulator as well as on a real device. We also advise you to maximize the LogCat window so you can more easily scroll up and down to see all of the generated events from this application. To maximize the LogCat window just double-click on the LogCat tab. Now go to the application UI and touch and release on the top-most button marked returns true . If you re using the emulator, use your mouse to click and release the returns true button. You should see at least two events logged in LogCat. The messages are tagged as coming from trueBtnTop and were logged from the onTouch() method in MainActivity. See MainActivity.java for the onTouch() method s code. As you view the LogCat output, see which method calls are producing the values. For example, the value displayed after Action: comes from the getAction() method. Listing 16 4 shows a sample of what you might see in LogCat from the emulator, and Listing 16 5 shows a sample of what you might see from a real device.

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The com.google.android.maps.MapView control can display a map. You can instantiate this control either via XML layout or code, but the activity that uses it must extend MapActivity. MapActivity takes care of multithreading requests to load a map, perform caching, and so on. Listing 4-23 shows an example instantiation of a MapView. Listing 4-23. Creating a MapView Control via XML Layout <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <com.google.android.maps.MapView android:layout_width="fill_parent" android:layout_height="fill_parent" android:enabled="true" android:clickable="true" android:apiKey="myAPIKey" /> </LinearLayout> As shown, the interesting thing about using the MapView is that you ll have to first obtain a mapping-API key. To get a key, you ll have to register with Google at http://code.google.com/android/toolbox/apis/mapkey.html After you obtain an API key, you can then instantiate a MapView either programmatically or via XML. In XML, you set the android:apiKey property. In code, you ll have to pass the key to the MapView constructor. Note that we ll discuss the MapView control in detail in 7, when we discuss location-based services.

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