java - Android how to call MainActivity method from Non Activity class -


i troubing on runtime permission method in non activity class. want call public mainactivity method helper class.

mainactivity.java method

public void a(){   //some method }

now helper class:

class b{   private context mcontext;   public b(context context){     this.mcontext = context;     //now calling mainactivity method     mainactivity mainactivity = new mainactivity();     mainactivity.a();    } }

calling b class cactivity

oncreate(){   b b = new b(this); }

but gives me runtime error

update:

my method has runtime permission method isn't static . ex- requestpermissions(), onrequestpermissionsresult()

make method static can call without creating class object

eg 

public static void testing() {}

now calling 

mainactivity.testing();

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