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I am building application for tab. On click of button I am trying to show Activity (say A ) with theme @android:style/Theme.Dialog Inside activity A I am creating actionbar and adding 4 tabs. On click of tab I want to change fragment. Everything works fine until I am not applying theme @android:style/Theme.Dialog After applying theme I am getting exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ebuilder/com.ebuilder.views.MyTabActivity}: java.lang.NullPointerException at following line: actionBar.addTab(actionBar.newTab().setCustomView(R.layout.tab_home). setTabListener(homeListener), 0); I have two questions: 1. What is going wrong if I apply theme dialog? 2. Is my approach right? Let me know if anybody know another approach. Edit1: * Manifest file * <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.vivek" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:targetSdkVersion="14"/> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".FragmentInsideFragmentTestActivity" android:label="@string/app_name" android:theme="@style/Theme.CustomDialog" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> res/values/style.

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