NullPointerException: with ActionBar.setDisplayHomeAsUpEnabled(boolean)’ on a null object reference

by

The cause of your issue is using MainActivity extend Activity with support theme style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar". It’s incompatible things.
Which min sdk you need?

In your code having MainActivity extends Activity you don’t need AppCompatTheme. Use name="AppTheme" parent="android:Theme.Light“

If you are using Theme.AppCompat.Light.DarkActionBar, you should extend your Activity from AppCompatActivity, and use getSupportActionBar().

Instead of:

public class MainActivity extends Activity {

use:

public class MainActivity extends AppCompatActivity {

and instead of:

getActionBar().setTitle(mTitles);

use:

getSupportActionBar().setTitle(mTitles);

More Related Contents:

  1. How to add Action Bar from support library into PreferenceActivity?
  2. How to get Toolbar from fragment?
  3. Error implementing Support Library Action Bar
  4. Failed to resolve: com.android.support:cardview-v7:26.0.0 android
  5. java.util.zip.ZipException: duplicate entry during packageAllDebugClassesForMultiDex
  6. Implementing SearchView in action bar
  7. Nested Recycler view height doesn’t wrap its content
  8. Actionbar not shown with AppCompat
  9. In android app Toolbar.setTitle method has no effect – application name is shown as title
  10. Display back button on action bar
  11. actionbar up navigation with fragments
  12. Hiding the ActionBar on RecyclerView/ListView onScroll
  13. Change EditText hint color when using TextInputLayout
  14. Change color of the overflow button on ActionBar
  15. Disabling User dragging on BottomSheet
  16. ERROR :rendering problems The following classes could not be found android.support.v7.internal.widget.ActionBarOverlayLayout
  17. How to hide ToolBar when I scrolling content up?
  18. How to change Toolbar home icon color
  19. Using ActionBarSherlock With the New SupportMapFragment
  20. Android: getSupportActionBar() always returns null in ActionBarSherlock library
  21. Custom Translucent Android ActionBar
  22. Update support library 23.2.0 build bug
  23. Navigation Drawer with backword compatibility android
  24. How to handle onContextItemSelected in a multi fragment activity?
  25. How to add button in ActionBar(Android)?
  26. Error while merging dex Program type already present: android.support.v4.os.ResultReceiver$MyResultReceiver
  27. How to reduce the gap between navigation icon and toolbar title?
  28. How to add dividers between specific menu items?
  29. FragmentStatePagerAdapter with ChildFragmentManager – FragmentManagerImpl.getFragment results in NullPointerException
  30. How do the Android Support Libraries work?

Leave a Comment