Fragment Onresume() & Onpause() Is Not Called on Backstack

Fragment onResume() & onPause() is not called on backstack

The fragments onResume() or onPause() will be called only when the Activities onResume() or onPause() is called.
They are tightly coupled to the Activity.

Read the Handling the Fragment Lifecycle section of this article.

how to call OnResume and Onpause methods in fragment?

The fragments onResume() or onPause() will be called only when the Activities onResume() or onPause() is called. They are tightly coupled to the Activity.

Managing the lifecycle of a fragment is a lot like managing the lifecycle of an activity.

• Resumed :->
  The fragment is visible in the running activity.
• Paused :->
  Another activity is in the foreground and has focus, but the activity in which this fragment lives is still visible (the foreground activity is partially transparent or doesn't cover the entire screen).
• Stopped :->
  The fragment is not visible. Either the host activity has been stopped or the fragment has been removed from the activity but added to the back stack. A stopped fragment is still alive (all state and member information is retained by the system). However, it is no longer visible to the user and will be killed if the activity is killed.

for more information read from android docs

Fragment inside another fragment doesn't call onResume() and onPause()?

The reason that Fragment B isn't calling it's onResume or onPause() is because it is not being added to the view properly. If you want to nest fragments you need to use getChildFragmentManager() instead of the regular FragmentManager() when managing the nested fragments:

getChildFragmentManager().beginTransaction().replace(R.id.fragBContainer, FragmentB()).commit()

OnResume() is not called of the home activity when back pressed from a fragment

From what I understand, you have an activity with a fragment. Then you load a new fragment and then you press back. This interaction will not fire the activity's onResume() because the activity has never been stopped. If there is logic you need to perform between fragments, it needs to be somewhere else. I cannot provide any more details without some more information.

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