First we are testing using hardware and identify where is the issue and using a log and debug we are we are exactly point out the place where the issue is occurred and using debug we check using debug or any logcat we are using to identify what is the condition and what are the statements coming from the that application based on that result we check the code lines and by if there is an any unexpected error means we go through from the starting that is either from a database or any storage issue is there or any other things we need to check and then we will resolve that
