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NOTE: In Listing 16 5, you may have noticed that the pressure and size values did not change during the touch sequence on a real device This is actually due to a bug in the Android code for the Motorola Droid device (Android 20) which will be fixed Normally, a real device would show changing values for pressure and size as a touch sequence progresses from the ACTION_DOWN event, through ACTION_MOVE events, and finally to the ACTION_UP event The down time and event time values operate in the same way between the emulator and a real device, the only difference being that the real device has much larger values The elapsed times work the same The edge flags are for detecting when a touch has reached the edge of the physical screen.

Like Swing, Android offers a collection of view classes that act as containers for views. These container classes are called layouts (or layout managers), and each implements a specific strategy to manage the size and position of its children. For example, the LinearLayout class lays out its children either horizontally or vertically, one after the other. The layout managers that ship with the Android SDK are defined in Table 4-2. Table 4-2. Android Layout Managers

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The Android SDK documentation says that the flags are set to indicate that a touch has intersected with an edge of the display (top, bottom, left or right) However, the getEdgeFlags() method may always return zero, depending on what device or emulator it is used on With some hardware, it is too difficult to actually detect a touch at the edge of the display, so Android is supposed to pin the location to the edge and set the appropriate edge flag for you This doesn t always happen, so you should not rely on the edge flags being set properly The MotionEvent class provides a setEdgeFlags() method so you could set the flags yourself if you wanted to The last thing to notice is that our onTouch() method returns true because our TrueButton is coded to return true.

Okay, I lied. There really are not any shalts in the OCaml exception world. It should not be taken to mean that you should do whatever you want. There are best practices associated with exception handling, and many of them are as applicable to OCaml as they are to any other language. One of the most important of these best practices is that exceptions should cover situations that are errors. You should examine each case in which you are raising an exception and make sure that the exception is being raised because something happened that is wrong. Exceptions should not be used as final else s in code. You should also use exceptions when the error condition is the exception instead of writing checking code. Here is an example. Suppose that you have a hashtable; you want to return a value if it exists or return some default value if it doesn t. You could implement it with checking code like this: # let find xval ht = if (Hashtbl.mem ht xval) then Hashtbl.find ht xval else (Hashtbl.add ht xval 0;0);; val find : 'a -> ('a, int) Hashtbl.t -> int = <fun> This code works, but the value should be found, so checking for it is wasteful. Instead of checking every time, you can replace the check with a try with block, yielding a function more like this, which is more efficient:

Returning true tells Android that the MotionEvent object has been consumed and there is no reason to give it to someone else It also tells Android to keep sending touch events from this touch sequence to this method That s why we got the ACTION_UP event, as well as the ACTION_MOVE event in the case of the real device Now touch the returns false button near the top of the screen For the remainder of this section we will show only sample LogCat output from a real device The differences have been explained, so if you are working with the emulator you should understand why you are seeing what you are seeing Listing 16 6 shows a sample LogCat output for your returns false touch..

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