Attempt to invoke virtual method ' void Android.support.v7.app.ActionBar.setHomeButtonEnabled (Boolean) ' on a null object R Eference

Summary of Workarounds for "Android" Getactionbar () null

Setcontentview (R.layout.activity_main);
Android.support.v7.app.ActionBar ActionBar = Getsupportactionbar ();
Actionbar.sethomebuttonenabled (TRUE);
Actionbar.setdisplayshowhomeenabled (TRUE);
Actionbar.seticon (R.mipmap.ic_launcher_finish);   

Java.lang.RuntimeException:Unable to start Activity componentinfo{com.qindou.currenciesnc/ Com.qindou.currenciesnc.MainActivity}: Java.lang.NullPointerException:Attempt to invoke virtual method ' void Android.support.v7.app.ActionBar.setHomeButtonEnabled (Boolean) ' on a null object reference
At Android.app.ActivityThread.performLaunchActivity (activitythread.java:2817)
At Android.app.ActivityThread.handleLaunchActivity (activitythread.java:2892)
At Android.app.activitythread.-wrap11 (Unknown source:0)
At Android.app.activitythread$h.handlemessage (activitythread.java:1593)
At Android.os.Handler.dispatchMessage (handler.java:105)
At Android.os.Looper

Is this another version of the problem? Mountain High road far pit deep AH!

Attempt to invoke virtual method ' void Android.support.v7.app.ActionBar.setHomeButtonEnabled (Boolean) ' on a null object R Eference