java - dynamically selecting a radio button from a radio group -

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i have stored previous selection of radio button in memory. when start activity has these radio buttons, show selected radio button selected. using java android studio. below copy of code:

public void getselectedunits() {    if (symbol.equals("g")) {     radio_g.check(r.id.radiobuttong);         toast.maketext(settingsscreen.this,                 " grams(g) selected", toast.length_long).show();     }     else if (symbol.equals("kg")) {       radio_g.check(r.id.radiobuttonkg);         toast.maketext(settingsscreen.this,                 " kilograms(g) selected", toast.length_long).show();         }

...

please note radio_g.check(r.id.radiobuttonx); statement crashes program, can idea trying accomplish. want set radio button selected during last visit activity selected. toast statements debugging , working fine.

solution used:

i got issue , able solve it, want update post in case reads in future. solution presented below, given other posts such as: how programmatically select radiobutton in activity

   pounds = (radiobutton) findviewbyid(r.id.radiobuttonlb);    if(devicecontrolactivity.symbol.equals("lb")) pounds.setchecked(true);


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