java - ImageView.findViewById on a null object reference -


this question has answer here:

i've made simple mistake cannot figure out how correct it. it's null object reference .

mainactivity

layout

thanks advice !

instead 

imageview = (imageview)imageview.findviewbyid(r.id.simplicity_bg_id);

replace with

imageview = (imageview) findviewbyid(r.id.simplicity_bg_id);

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