java - First app in android studio, R class -


i've install android studio learning developing apps in android. i've installed newest java , android studio in first generated hello world project, have many issues r class. android version rendering 5.1.1.

when click on activity_main.xml, don't have smartphone illustration design. there following error:

note: project contains java compilation errors, can cause rendering failures custom views. fix compilation problems first.  following classes not instantiated: - android.support.v7.internal.widget.actionbaroverlaylayout (open class, show exception, clear cache)  tip: use view.isineditmode() in custom views skip code or show sample data when shown in ide  exception details  java.lang.noclassdeffounderror: not initialize class android.support.v7.internal.widget.actionbaroverlaylayout   at  java.lang.reflect.constructor.newinstance(constructor.java:422)   at  android.view.layoutinflater.inflate(layoutinflater.java:482)   at  android.view.layoutinflater.inflate(layoutinflater.java:414)   at  com.android.layoutlib.bridge.bars.bridgeactionbar.<init>(bridgeactionbar.java:84)   at  com.android.layoutlib.bridge.bars.appcompatactionbar.<init>(appcompatactionbar.java:56)

how can resolve error?

in preview tab, change preview version "automatically pick best" "21" , should work fine.


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