android - Toolbar color does not stays the same -

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i wanted change toolbar color programmatically, using code:

((appcompatactivity) getactivity()).getsupportactionbar().setbackgrounddrawable(new colordrawable(getresources().getcolor(r.color.test)));

i have 2 fragments, , b, suppose if switch a, color changes blue, if switch b, color changes test, again if switch , b, color stays blue!

for color changes in both fragments using above code. above code trigger on oncreateview, problem think.

how can make listener this, when fragment on screen each time , color changes?

use 

getsupportactionbar().setbackgrounddrawable(new colordrawable(getresources().getcolor(r.color.test)));

and 

getsupportactionbar().setbackgrounddrawable(new colordrawable(getresources().getcolor(r.color.blue)));

in activity not in fragments


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