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Unable to add custom view to Android action bar, why?

I am trying to add my custom view to the action bar.

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

my 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

but I get a nullpointer exception. when I debug, the addView object is populated and its value is not null. Is ViewGroupRoot mandatory during bloat?

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:

Added setCustomView(R.layout.mylayout.xml); before adding to customView in the action bar

still could not see the button in the action bar

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1 answer

I think your problem is most likely caused by a call to getActionBar () because the action bar is not included in your activity. Try adding the following attribute:

 android:targetSdkVersion="11"

in the 'uses-sdk' node in your manifest. Focusing on the cellular SDK, you will get an action panel that is included in your activity. You can also achieve this by installing the theme of your application on one of the Holo themes. eg.

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

If you include this attribute in the manifest node application, you should also get an action bar to play.

You also need to set the display options on the action bar to DISPLAY_SHOW_CUSTOM to display any custom view. Try adding this line after setting up your custom view:

 getActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);

See this page in the “Using the Action Bar” section for more details: http://developer.android.com/reference/android/app/ActionBar.html

Hope this helps!

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Source: https://habr.com/ru/post/898349/

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