Fragment Transaction .replace() Method Throwing Null Object Reference

I have a program whose default UI is a ViewPager with a TabLayout. The MainActivity is a CoordinatorLayout. The Viewpager, AppBarLayout, and TabLayout are all wrapped in a Relati

Solution 1:

just try changing fm with getSupportFragmentManager() so it would become

FragmentTransactionft= getSupportFragmentManager().beginTransaction();

Solution 2:

In my case exactly the same exception was thrown on the attempt to remove fragment that was null. You can insert a code

FragmentTransaction transaction = getSupportFragmentManager().beginTransaction().remove(null).commit();

and see your error log. The problem is that exception will be throwed not on this string, but little bit later somewhere inside of Android sources and you do not see which of your code strings was the reason of the exception.