Or you can register for the event that the state of the phone changes, e.g., someone is calling.A provider defines a structured interface to application data.
The Android operating system can be divided into the four areas as depicted in the following graphic.
An Android application developer typically works with the two layers on top to create new Android applications.
An Android virtual device which uses the Intel system image is much faster in execution.
Intel based images sometimes do not work on certain machines, in this case try an ARM based system image.
Calculating the layout and drawing the views is a resource intensive operation.