App Crashing After I Rotate Device And Click The Menu

I have a navigation drawer with fragments and my app is crashing after I rotate the device and click on the menu. My code on main activity is: public class MainActivity extends Fra

Solution 1:

You only call setupDrawer if your savedInstanceState is null. This mean it isn't called when you recreate the activity on rotation. However that's where you set the value of mDrawerLayout . So when onClick is called after rotation, mDrawerLayout is null. To fix this, you need to set the value of mDrawerLayout in both cases.

Actually I have no idea why you aren't calling setupDrawer when savedInstanceState is non null, it seems very wrong.

Solution 2:

Move

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);expListView = (ExpandableListView) findViewById(R.id.lvExp);

from setUpDrawer() to onCreate() before if block.

Solution 3:

Ok i got it, had to modify somethings but it worked. Took out the setUpDrawer() from the if null, like suggest from Gabe Sechan. and change it to

setUpDrawer();
        if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, new Inicio()).commit();
        }

I also deleted fragment = new Inicio(); and all the getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, fragment).commit();

And updated all cases to case 0:fragment = new enunciados_definiciones(); break; Thanks