How do I send exception to callback in Android? -


i have class (named c) check structure of json , if structure wrong, throws exception. class called class b. can use try catch in class b. actually, class b called class a, provide callback class b. how send exception class c called class b callback (onfinishlistener) in class a? want provide try catch in callback declaration in class a, not class b.

public class {     b b = new b();     b.getresponsefromserver(new b.onfinishlistener {         @override         public void onfinish(object response) {     }); }  public class b {     public static interface onfinishlistener {         void onfinish(object response);     }      //other code      public void getresponsefromserver(onfinishlistener onfinishlistener) {     response.listener<jsonobject> listener = new response.listener<>() {             @override             public void onresponse(jsonobject response) {                 try {                     onfinishlistener.onfinish(c.somemethod(response);                 catch (jsonexception e) {                     log.e("error", e.getmessage());                 }             }         }           //do volley tasks     } }  public class c {     public static object somemethod(jsonobject json) throws jsonexception {         if (json.has("something")) {             //return         } else {             throw new jsonexception("error");         }     } }

i got solution. need add 1 method interface (onexception) , deliver exception interface on catch(exception).

public class {      b b = new b();      b.getresponsefromserver(new b.onfinishlistener {          @override          public void onfinish(object response) {}            @override          public void onexception(jsonexception response) {}  );  }    public class b {      public static interface onfinishlistener {          void onfinish(object response);          void onexception(jsonexception e);      }        //other code        public void getresponsefromserver(onfinishlistener onfinishlistener) {  	response.listener<jsonobject> listener = new response.listener<>() {              @override              public void onresponse(jsonobject response) {                  try {                      onfinishlistener.onfinish(c.somemethod(response);                  catch (jsonexception e) {                      onfinishlistener.onexception(e);                  }              }          }             //do volley tasks      }  }


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