The ListView is a widget used extensively in Android applications to display data. Nowadays most high end phones can handle unoptimized code at tolerable speeds. However, a large percentage of Android devices are still using single core processors with limited memory. This post explains an easy way of optimization for developers.

I’m sure that you have seen that check when leaving an application, it is very simple to implement and I will show you how it works

We will use the property isShown() from the class Toast to make a simple exit check to avoid to close de application by a mistake.