NullPointerException in ActionBar.setHomeButtonEnabled

Question

Good evening. I have android:minSdkVersion="14" android:targetSdkVersion="16"

And I have a NullPointerException in onCreate method:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.tain);

    mCollectionPagerAdapter = new CollectionPagerAdapter(
            getSupportFragmentManager());

    final ActionBar actionBar = getActionBar();

    //Here is the error
    actionBar.setHomeButtonEnabled(false);

    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mCollectionPagerAdapter);
    mViewPager.setOnPageChangeListener(
            new ViewPager.SimpleOnPageChangeListener() {
                @Override
                public void onPageSelected(int position) {
                    actionBar.setSelectedNavigationItem(position);
                }
            });

        for (int i = 0; i < mCollectionPagerAdapter.getCount(); i++) {
            actionBar.addTab(actionBar.newTab()
                    .setText(mCollectionPagerAdapter.getPageTitle(i))
                    .setTabListener(this));
        }

}

I have a simillar code in other project and it works right. The versions of the libraries in both projects are simillar too. What may caused this exception and what can I change?

Thanks.

Which theme is your activity using? Does it have an ActionBar in it? — Raghav Sood, Mar 28 '13 at 14:03
Yeah, that's a mistake. I have android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen" — Valeriy, Mar 28 '13 at 14:08

score 17 · Answer 1 · answered Mar 28 '13 at 14:06

17

In your manifest make sure your activity has (of similar):

<activity android:theme="@android:style/Theme.Holo">

answered Mar 28 '13 at 14:06

Bill Mote

12,644
7
58
82

score 4 · Answer 2 · edited May 23 '17 at 12:17

4

your error is getting caused by the getActionBar() method.

Check this link:

getActionBar() returns null

edited May 23 '17 at 12:17

Community

1
1

answered Mar 28 '13 at 14:07

Andres L

683
9
20

score 2 · Answer 3 · answered Apr 20 '16 at 17:38

2

Remove android:theme="@style/AppTheme" in your manifest file

answered Apr 20 '16 at 17:38

NagaRaju

17
6

score 0 · Answer 4 · answered Nov 23 '16 at 17:42

0

Made following changes in AndroidManifest file works for me

 @android:style/Theme.Holo.Light.DarkActionBar

answered Nov 23 '16 at 17:42

KH_AJU

109
2
18

NullPointerException in ActionBar.setHomeButtonEnabled

4 Answers4