Tell me how call some one in android by creating apk that only call a sertain number like 1234567890

Answer 1

Save your phone number in string

int number = 123456789;
String num = "tel:"+number;

Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse(num));
startActivity(intent);

And you are done

Note : in android marshmallow and above you want to get runtime permission befor using this method

Answer 2

i did not understand it