This may be a ridiculous Java question about exception handling, but I have a UI actor (an Android Activity) that is requesting services from my subclass of ContentProvider. The subclass wants to throw some exceptions when sd-card is full, sd-card is missing, network i/o errros, etc. However, when I code the CP-subclass to throw my exceptions, the compiler offers to add the exceptions to the CP class. Obviously, I don’t want to modify the base class, but I want the UI to catch the sub-class’ exceptions.
Make sense? Is this possible? If not, is there a better pattern for my service subclass to get its throwable object back to the UI?
You only need to declare and catch “checked exceptions”. You do not need to declare or explicitely catch RuntimeExceptions. So you can throw a RuntimeException and catch it whereever you like up in the hierarchy.