No se puede agregar una vista personalizada a la barra de acciones de Android, ¿por qué?

Question

Estoy tratando de agregar mi vista personalizada a la barra de acción.

final View addView=getLayoutInflater().inflate(R.layout.home_actionbar_buttons, null); 
     getActionBar().setCustomView(addView); 

mi XML,

<LinearLayout android:id="@+id/linearLayout1" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_height="wrap_content" android:layout_width="match_parent"> 
    <Button android:text="Refresh" android:layout_height="wrap_content" 
     android:id="@+id/btn_refresh" android:layout_width="wrap_content"></Button> 
</LinearLayout 

pero me sale excepción NullPointer. cuando depuro, el objeto addView se llena y no es nulo. es ViewGroupRoot obligatorio mientras se infla?

EDIT 1: Logcat

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 -> /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): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<< 
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 

EDIT 2:

Agregado setCustomView(R.layout.mylayout.xml); antes de añadir a CustomView en actionbar

todavía no es capaz de ver el botón en la barra de acción

Answer 1

Creo que es muy probable que su problema sea que la llamada getActionBar() falla debido a que la barra de acción no está incluida en su actividad. Intente agregar el siguiente atributo:

android:targetSdkVersion="11" 

al nodo 'uses-sdk' en su manifiesto. Al dirigirse a un SDK en panal, obtendrá una barra de acción incluida en su actividad. También puede lograr esto estableciendo el tema de su aplicación en uno de los temas de Holo. p.ej.

android:theme="@android:style/Theme.Holo.Light" 

Si incluye ese atributo en el nodo de la aplicación del manifiesto, también debe obtener una barra de acción para jugar.

También debe establecer las opciones de visualización en la barra de acción en DISPLAY_SHOW_CUSTOM para que aparezca cualquier vista personalizada. Trate de añadir esta línea después de fijar la vista personalizada:

getActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM); 

Mira lo que por menos de 'Uso de la barra de acción' para más detalles: http://developer.android.com/reference/android/app/ActionBar.html

Espero que ayude!