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While going through the android developer site i found this 
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it says to avoid memory leak we should release resources in onStop()but how to do so.
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The only way to release memory from an app is to release object references that the app holds, making the memory available to the garbage collector. That is with one exception: any files mmapped in without modification, such as code, can be paged out of RAM if the system wants to use that memory elsewhere.
To avoid memory leaks, memory allocated on heap should always be freed when no longer needed.
Memory leaks occur when an application allocates memory for an object, but then fails to release the memory when the object is no longer being used. Over time, leaked memory accumulates and results in poor app performance and even crashes.
Basically any objects that are properly nulled are considered released and their memory can be reclaimed by the OS. Your question is too general and it's hard to offer a exhaustive list of methods, but you should generally be aware of these:
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