Using MaterialButton problem-CodePudding

Using MaterialButton, ICONS show not to come out, don't know what happened, but is in place, text excursion, and setting iconTint also does show color, but the icon is anyway not to come out,

 & lt; Com. Google. Android. Material. Button. MaterialButton 
Android: theme="@ style/theme. MaterialComponents. Light. NoActionBar" 
App: iconGravity="textStart" 
Android: textColor="# 333" 
App: iconPadding="10 dp" 
App: strokeColor=# "CCC" 
App: strokeWidth="1 dp" 
App: cornerRadius="0 dp" 
App: iconTint="@ color/text_color" 
Android: textSize="16 dp" 
App: iconSize="22 dp" 
App: icon="@ drawable/ic_launcher"/& gt;