Yoctopuce Yocto-RangeFinder, User Manual, Page: 119 / 497

protected void onStop ()
{
super . onStop () ;
YAPI. FreeAPI () ;
}
}
17.7. Error handling
When you implement a program which must interact with USB modules, you cannot disregard error
handling. Inevitably, there will be a time when a user will have unplugged the device, either before
running the software, or even while the software is running. The Yoctopuce library is designed to help
you support this kind of behavior, but your code must nevertheless be conceived to interpret in the
best possible way the errors indicated by the library.
The simplest way to work around the problem is the one used in the short examples provided in this
chapter: before accessing a module, check that it is online with the
isOnline
function, and then
hope that it will stay so during the fraction of a second necessary for the following code lines to run.
This method is not perfect, but it can be sufficient in some cases. You must however be aware that
you cannot completely exclude an error which would occur after the call to
isOnline
and which
could crash the software.
In the Java API for Android, error handling is implemented with exceptions. Therefore you must catch
and handle correctly all exceptions that might be thrown by the API if you do not want your software
to crash soon as you unplug a device.
17. Using the Yocto-RangeFinder with Android
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