actionbarsherlock getSupportActionBar() return null in android4.0,but in 2.3.3 is ok - actionbarsherlock

Question

application use actionbarsherlock,but main activity get getsupportactionbar returns null.
AndroidManifest.xml:
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/Light1Theme" >
<activity
android:name=".activity.LogonActivity"
android:configChanges="orientation|keyboardHidden"
android:windowSoftInputMode="adjustUnspecified|stateHidden" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
...
themes.xml:
<style name="Light1Theme" parent="Theme.Sherlock.Light">
LogonActivity.ava
extends SherlockActivity implements OnSharedPreferenceChangeListener {
...
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//requestWindowFeature(Window.FEATURE_NO_TITLE);
//getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.logon);
try{
final ActionBar ab = getSupportActionBar();
//return null
ab.setBackgroundDrawable(getResources().getDrawable(R.drawable.ab_bg_black));
getSupportActionBar().setIcon(R.drawable.hospital);
}catch(Exception e){
Log.e("", e.getMessage());
}

Answer 1

I was facing this same issue a few hours ago, and it turned out, the root of the problem was that I used a theme with no title bar.
This reply from Jake Wharton, the developer of actionbarsherlock will help you sort it out.
In short: on android versions ICS and newer, setting the attribute android:windowNoTitle will affect the action bar's display (as it is a core feature in those versions).
The ABS has wrapped it into windowNoTitle (with no namespace / default abs namespace), so depending on the android version your application is installed on, you will get the proper display.
If you have the line
<item name="android:windowNoTitle">true</item>
in your style definition, just change it to
<item name="windowNoTitle">true</item>
or completely leave it out / remove it from your theme (abs will handle it correctly!)

Answer 2

I was facing this same issue now , and I found that use android:theme="#style/Theme.Sherlock" is enough.
if you use
<item name="windowNoTitle">true</item>
or
<item name="android:windowNoTitle">true</item>
It will crash application , may be Jake fix this in Theme.Sherlock.
So Here is my solution now:
<application
android:name="XXXXApplication"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/Theme.Sherlock" >
And it works well on ICS+ and pre-ICS , test on android 2.3.5,2.3.7,CM7 , android 4.0,4.1

Answer 3

In my case, I face this issue when I set the theme android:theme="#style/Theme.Sherlock.NoActionBar", then call getSupportActionBar() to get the actionbar. If you want to manage the action bar, just turn the them to android:theme="#style/Theme.Sherlock.

Answer 4

I had the same problem. I have simple removed below line of code and its work like a charm.
requestWindowFeature(Window.FEATURE_NO_TITLE);