title: Unable to Add custom view to Android Action bar,why?
body: <p>I am trying to add my custom view into Action bar.</p>
  
  <pre><code>final View addView=getLayoutInflater().inflate(R.layout.home_actionbar_buttons, null);
          getActionBar().setCustomView(addView);
  </code></pre>
  
  <p>my XML,</p>
  
  <pre><code>&lt;LinearLayout android:id="@+id/linearLayout1"
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_height="wrap_content" android:layout_width="match_parent"&gt;
      &lt;Button android:text="Refresh" android:layout_height="wrap_content"
          android:id="@+id/btn_refresh" android:layout_width="wrap_content"&gt;&lt;/Button&gt;
  &lt;/LinearLayout
  </code></pre>
  
  <p>but i get nullpointer exception. when i debug,addView object gets populated and its not null.
  is ViewGroupRoot mandatory while inflating?</p>
  
  <p>EDIT 1:
  Logcat</p>
  
  <pre><code>09-30 12:50:11.625: DEBUG/PackageManager(74):   Activities: com.example.actionbar.MainActivity
  09-30 12:50:11.645: INFO/ActivityManager(74): Force stopping package com.example.actionbar uid=10047
  09-30 12:50:11.825: INFO/installd(34): move /data/dalvik-cache/data@app@com.example.actionbar-1.apk@classes.dex -&gt; /data/dalvik-cache/data@app@com.example.actionbar-1.apk@classes.dex
  09-30 12:50:11.825: DEBUG/PackageManager(74): New package installed in /data/app/com.example.actionbar-1.apk
  09-30 12:50:12.215: DEBUG/PackageManager(74): generateServicesMap(android.accounts.AccountAuthenticator): 3 services unchanged
  09-30 12:50:12.306: DEBUG/PackageManager(74): generateServicesMap(android.content.SyncAdapter): 5 services unchanged
  09-30 12:50:12.475: WARN/RecognitionManagerService(74): no available voice recognition services found
  09-30 12:50:12.605: DEBUG/dalvikvm(143): GC_EXPLICIT freed 2K, 17% free 14616K/17415K, paused 5ms+26ms
  09-30 12:50:12.985: INFO/AccountTypeManager(202): Loaded meta-data for 1 account types, 0 accounts in 14ms
  09-30 12:50:13.555: DEBUG/dalvikvm(143): GC_FOR_ALLOC freed 1125K, 17% free 14564K/17415K, paused 121ms
  09-30 12:50:14.435: DEBUG/dalvikvm(143): GC_FOR_ALLOC freed 4109K, 33% free 11749K/17415K, paused 155ms
  09-30 12:50:15.254: DEBUG/dalvikvm(143): GC_CONCURRENT freed 1055K, 29% free 12509K/17415K, paused 5ms+10ms
  09-30 12:50:15.894: DEBUG/dalvikvm(143): GC_CONCURRENT freed 1109K, 24% free 13406K/17415K, paused 6ms+6ms
  09-30 12:50:16.404: DEBUG/dalvikvm(143): GC_CONCURRENT freed 1084K, 18% free 14348K/17415K, paused 5ms+6ms
  09-30 12:50:16.924: DEBUG/dalvikvm(74): GC_EXPLICIT freed 752K, 47% free 14474K/26951K, paused 49ms+21ms
  09-30 12:50:16.944: DEBUG/AndroidRuntime(1196): Shutting down VM
  09-30 12:50:16.994: INFO/AndroidRuntime(1196): NOTE: attach of thread 'Binder Thread #3' failed
  09-30 12:50:17.044: DEBUG/dalvikvm(1196): GC_CONCURRENT freed 111K, 84% free 331K/2048K, paused 4ms+1ms
  09-30 12:50:17.044: DEBUG/jdwp(1196): Got wake-up signal, bailing out of select
  09-30 12:50:17.044: DEBUG/dalvikvm(1196): Debugger has detached; object registry had 1 entries
  09-30 12:50:17.974: DEBUG/AndroidRuntime(1210): &gt;&gt;&gt;&gt;&gt;&gt; AndroidRuntime START com.android.internal.os.RuntimeInit &lt;&lt;&lt;&lt;&lt;&lt;
  09-30 12:50:17.974: DEBUG/AndroidRuntime(1210): CheckJNI is ON
  09-30 12:50:19.174: DEBUG/AndroidRuntime(1210): Calling main entry com.android.commands.am.Am
  09-30 12:50:19.234: INFO/ActivityManager(74): Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.actionbar/.MainActivity } from pid 1210
  09-30 12:50:19.264: WARN/WindowManager(74): Failure taking screenshot for (216x135) to layer 21005
  09-30 12:50:19.315: DEBUG/AndroidRuntime(1210): Shutting down VM
  09-30 12:50:19.384: INFO/AndroidRuntime(1210): NOTE: attach of thread 'Binder Thread #3' failed
  09-30 12:50:19.384: INFO/ActivityManager(74): Start proc com.example.actionbar for activity com.example.actionbar/.MainActivity: pid=1218 uid=10047 gids={}
  09-30 12:50:19.484: DEBUG/dalvikvm(1210): GC_CONCURRENT freed 112K, 83% free 358K/2048K, paused 1ms+1ms
  09-30 12:50:19.484: DEBUG/jdwp(1210): Got wake-up signal, bailing out of select
  09-30 12:50:19.484: DEBUG/dalvikvm(1210): Debugger has detached; object registry had 1 entries
  09-30 12:50:22.095: DEBUG/AndroidRuntime(1218): Shutting down VM
  09-30 12:50:22.095: WARN/dalvikvm(1218): threadid=1: thread exiting with uncaught exception (group=0x40014760)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218): FATAL EXCEPTION: main
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.actionbar/com.example.actionbar.MainActivity}: java.lang.NullPointerException
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.app.ActivityThread.access$1500(ActivityThread.java:123)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.os.Handler.dispatchMessage(Handler.java:99)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.os.Looper.loop(Looper.java:126)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.app.ActivityThread.main(ActivityThread.java:3997)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at java.lang.reflect.Method.invokeNative(Native Method)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at java.lang.reflect.Method.invoke(Method.java:491)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at dalvik.system.NativeStart.main(Native Method)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218): Caused by: java.lang.NullPointerException
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at com.example.actionbar.MainActivity.onCreate(MainActivity.java:16)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700)
  09-30 12:50:22.134: ERROR/AndroidRuntime(1218):     ... 11 more
  09-30 12:50:24.615: DEBUG/dalvikvm(406): GC_EXPLICIT freed 8K, 6% free 6199K/6531K, paused 4ms+382ms
  09-30 12:50:26.825: DEBUG/dalvikvm(143): GC_EXPLICIT freed 991K, 16% free 14644K/17415K, paused 977ms+245ms
  09-30 12:50:28.545: WARN/ActivityManager(74):   Force finishing activity com.example.actionbar/.MainActivity
  09-30 12:50:28.545: WARN/WindowManager(74): Failure taking screenshot for (216x135) to layer 21010
  09-30 12:50:29.178: WARN/ActivityManager(74): Activity pause timeout for ActivityRecord{40a10fe0 com.example.actionbar/.MainActivity}
  09-30 12:50:29.287: WARN/ActivityManager(74): Launch timeout has expired, giving up wake lock!
  09-30 12:50:30.925: WARN/ActivityManager(74): Activity idle timeout for ActivityRecord{40a10fe0 com.example.actionbar/.MainActivity}
  09-30 12:50:33.144: INFO/Process(1218): Sending signal. PID: 1218 SIG: 9
  09-30 12:50:33.344: INFO/ActivityManager(74): Process com.example.actionbar (pid 1218) has died.
  09-30 12:50:33.554: WARN/InputManagerService(74): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@406a8790
  09-30 12:50:33.874: INFO/Process(1179): Sending signal. PID: 1179 SIG: 9
  09-30 12:50:36.494: DEBUG/dalvikvm(420): GC_EXPLICIT freed 10K, 6% free 6195K/6531K, paused 7ms+5ms
  09-30 12:50:40.959: WARN/ActivityManager(74): Activity destroy timeout for ActivityRecord{40a10fe0 com.example.actionbar/.MainActivity}
  09-30 12:50:41.595: DEBUG/dalvikvm(202): GC_EXPLICIT freed 174K, 5% free 6733K/7047K, paused 10ms+4ms
  09-30 12:50:46.618: DEBUG/dalvikvm(345): GC_EXPLICIT freed 17K, 5% free 6277K/6599K, paused 7ms+9ms
  </code></pre>
  
  <p><strong>EDIT 2:</strong></p>
  
  <p>Added <code>setCustomView(R.layout.mylayout.xml);</code> before adding to customView into actionbar</p>
  
  <p>still not able to see the button in action bar</p>