android - TextView on Button -

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i created custom button , added textview programmatically:

layout `framelayout` containing `button` , `textview` 


textview tv = new textview(context);         framelayout.layoutparams lp=new framelayout.layoutparams(framelayout.layoutparams.wrap_content,framelayout.layoutparams.wrap_content);         lp.gravity = gravity.center_vertical;         tv.setlayoutparams(lp);         tv.settextcolor(getcontrastcolor(left));         tv.settext(" " + left);         layout.addview(tv);

on device works (opo) - can see texts on emulator (nexus 5) doesn't - texts invisible - maybe below button.
knows problem?

i found answer - in android 5 there new property - elevation. needed check if sdk 21 , if change elavation of textview


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