Il giorno giovedì 18 febbraio 2016 13:10:38 UTC+1, Christian Cortese ha
scritto:
>
> Hello
>
> i'm doing an app and i have included this code
> http://developer.android.com/training/contacts-provider/retrieve-names.html
>
> but i have a problem...on kitkat it works well, in lollipop i can't see
> the menu toolbar and when i click on a contact the app crashes with a
> nullpointerexception
> *void.android.app.actionbar.setdisplayhomeasupenabled(boolean) etc*
> in this portion of code:
>
> if (Utils.hasHoneycomb()) {
> // Enables action bar "up" navigation
> getActionBar().setDisplayHomeAsUpEnabled(true);
>
>
> }
>
>
> how can i resolve this??
>
> thanks for all
>
>
this is the exception on Lollipop
02-18 13:41:15.304 31435-31435/todonotes.com.todonotes_buildfinale
E/AndroidRuntime: FATAL EXCEPTION: main
Process: todonotes.com.todonotes_buildfinale, PID: 31435
java.lang.RuntimeException: Unable to start activity
ComponentInfo{todonotes.com.todonotes_buildfinale/todonotes.com.todonotes_buildfinale.ContactDetailActivity}:
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)' on a null object
reference
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2378)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2440)
at
android.app.ActivityThread.access$800(ActivityThread.java:162)
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1348)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5422)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:914)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
Caused by: java.lang.NullPointerException: Attempt to invoke
virtual method 'void
android.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)' on a null object
reference
at
todonotes.com.todonotes_buildfinale.ContactDetailActivity.onCreate(ContactDetailActivity.java:59)
at android.app.Activity.performCreate(Activity.java:6057)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2440)
at
android.app.ActivityThread.access$800(ActivityThread.java:162)
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1348)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5422)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:914)
at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
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