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getActionBar() returns null

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By User



I'm having an odd problem. I am making an app with targetsdk 13.





In my main activity's onCreate method i call getActionBar() to setup my actionbar. This works fine when running on the Android 3.2 emulator, but when using Android 3.0 and 3.1 the getActionBar() method returns null.





I find this extremely odd, and i cannot see any reason why it would do so. Is this a bug with the emulators or is there something i need to do, in order to ensure that my application has an actionbar?





SOLUTION: I think I've found a solution for this problem. I wasn't using the setContentView to set a layout for the activity. Instead I was using fragmentTransaction.add(android.R.id.content, mFragment, mTag) to add a fragment to the activity. This worked fine in 3.2, but in earlier honeycomb versions the action bar is apparently not set if you don't use the setContentView in the onCreate() method. So I fixed it by using the setContentView() method in my onCreate() method and just supplying it with a layout that contained an empty FrameLayout. I can still use the fragmentTransaction.add(android.R.id.content, mFragment, mTag) method the same way as before.





It's not the prettiest fix, but it works.



Source: Tips4all
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Comments

  1. Tips For AllApril 9, 2012 at 2:34 AM

    I found this is just a half of the equation. You also need your Activity's window to have the title visible. I wrote an entire blog post about this topic.

    ReplyDelete
  2. Tips For AllApril 9, 2012 at 2:34 AM

    I faced the above issue where getActionBar() method returns null. I was calling the getActionBar() after setting the setContentView() and still its returning a null.

    I resolved the issue by setting the min-sdk version in Android Manifest file that was missing initially.
    <uses-sdk android:minSdkVersion="11" />

    ReplyDelete
  3. Tips For AllApril 9, 2012 at 2:34 AM

    One thing I wanted to add since I just ran into this, if you are trying to getActionBar() on an Activity that has a parent, it will return null. I am trying to refactor code where my Activity is contained inside an ActivityGroup, and it took a good few minutes for me to go "oh duh" after looking at the source of how an ActionBar gets created in source.

    ReplyDelete

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