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You cannot always follow this rule, but most of the time you can. Exception handlers are basically case statements (as discussed), but that doesn t mean you should use them like case statements. Handlers should be trustable code, which means you should not put important code that might itself raise exceptions in those handlers. This rule is about being careful with your control flow. You should always be thinking about how your handlers will affect control flow and future functionality. This is also something that can bite you very hard. Following is a very simple example that serves to illustrate that you must always scrutinize the code that executes in an exception handler: # let write_log_message filename message = let oc = try open_out_gen [Open_append] 0644 filename with Sys_error n -> open_out_gen [Open_append;Open_creat] 0644 filename in output oc message 0 (String.length message); close_out oc;; val write_log_message : string -> string -> unit = <fun> # write_log_message "/tmp/broken" "hello";; Exception: Sys_error "/tmp/broken: No such file or directory". # This example shows one of the problems associated with performing actions that can raise exceptions from within exception handlers. This code seems somewhat innocuous; if the file can t be opened, try to open it again in the handler, overlooking problems other than a nonexistent file.

[ more ACTION_MOVE events logged ] trueBtnTop trueBtnTop trueBtnTop trueBtnTop trueBtnTop trueBtnTop trueBtnTop trueBtnTop trueBtnTop Got view trueBtnTop in onTouch Action: 1 Location: 291.5864 x 223.43854 >>> Touch has left the view <<< Edge flags: 0 Pressure: 0.047058824 Size: 0.13333334 Downtime: 31690859ms Event time: 31692493ms Elapsed: 1634 ms and I'm returning true

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Even after your finger drags itself off of the button, we continue to get notified of touch events related to the button The first record in Listing 16 7 shows an event record where we re no longer on the button In this case, the X coordinate of the touch event is to the right of the edge of our button object But we keep getting called with MotionEvent objects until we get an ACTION_UP event This is because we continue to return true from the onTouch() method Even when we finally lift our finger off of the touchscreen, and even if our finger isn t on the button, our onTouch() method still gets called to give us the ACTION_UP event because we keep returning true This is something to keep in mind when dealing with MotionEvents.

<EditText android:layout_width="fill_parent" android:layout_weight="1.0" android:layout_height="wrap_content" android:text="three" android:gravity="right" /> </LinearLayout>

Silently ignoring exceptions is just plain wrong. It also can wreak havoc later on when your assumptions (or those who come after you) have changed and now that error you thought you could ignore is dangerous to ignore.

When the finger has moved off of the view, we could decide to cancel whatever operation might have been performed, and return false from the onTouch() method so we don t get notified of further events Or we could choose to continue to receive events (by returning true from the onTouch() method) and only perform the logic if the finger returns to our view before lifting off The touch sequence of events got associated to our top returns true button when we returned true from onTouch() This told Android that it could stop looking for an object to receive the MotionEvent objects, and just send all future MotionEvent objects for this touch sequence to us Even if we encounter another view when dragging our finger, we re still tied to the original view for this sequence Let s see what happens with the lower half of our application.

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