How to rectify NullPointerException in v4.DrawerLayout? [duplicate]

Answer 1

Similar issue was reported on google at https://code.google.com/p/android/issues/detail?id=202478

DrawerLayout.removeDrawerListener() is called without a set DrawerLayout.DrawerListener

But after releas of Android Support Library, revision 23.2.1 (March 2016) This issue has been resolved.

update Support Library to Android Support Library to 23.2.1 or to more updated version.

Answer 2

It seem that mDrawerLayout is not instantiated properly so it is giving a NULL Pointer Exception. To solve that, please instantiate all the view properly

DrawerLayout drawer;
drawer = findViewById(R.id.drawer_layout);

Answer 3

It seems like mDrawerLayout is null when calling .setDrawerListener().

Make sure you are using the same id for the navigation drawer in findViewById(R.id.drawer_layout) and in the layout file.

Answer 4

use getSupportActionBar() instead of getActionBar()