CODEWITHSUNDEEP
javaandroid
Azmat Karim Khan
Azmat Karim Khan

Reputation: 477

Get the Class name and Method Name at any Location in Java /Android

I am android developer and love logging very much. I had been using a convention for my logs that is in form of

[ClassName:methodName()]

Whenever i have to log something, this help me find exact location from where a specific log is generated and helpful in many cases.

Instead of writing each time the

ClassName

and

MethodName

manually i wrote a method. Their may be better approach of doing this. Any answer without using loop is Accepted.

public static String getRef(Object object) {
        StackTraceElement[] elements = Thread.currentThread().getStackTrace();
        String method = "";
        if (elements.length > 0) {
            for (int i = 0; i < elements.length; i++) {
                if (elements[i].getClassName().equals(object.getClass().getCanonicalName())) {
                    method = elements[i].getMethodName();
                    break;
                }
            }
        }
        return "[" + object.getClass().getSimpleName() + "::" + method + "()]";
    }

Calling:

Log.d(STRING_TAG , GlobalConfig.getRef(this) + " Server Response:"+json);

i had already tried using

Object.getClass().getEnclosingMethod();

but its always returning me null and also it is supposed to return the method name where it is called right? as the documentation says

If this Class object represents a local or anonymous class within a method, returns a Method object representing the immediately enclosing method of the underlying class. Returns null otherwise. In particular, this method returns null if the underlying class is a local or anonymous class immediately enclosed by a type declaration, instance initializer or static initializer.
Return
Method the immediately enclosing method of the underlying class, if that class is a local or anonymous class; otherwise null.

Upvotes: 2

Views: 3074

Answers (1)

Bruno
Bruno

Reputation: 3089

If you going to call it directly, I explain:

  1. You are on class A, and want to log that you are here
  2. You will call this method directly from class A

You can use this: 

 StackTraceElement[] elements = Thread.currentThread().getStackTrace();
 String method = "";
 method = elements[elements.length - 2].getMethodName();
 return "[" + object.getClass().getSimpleName() + "::" + method + "()]";

Where you get the last but one class called. Ex:

public class Random {

 public static void main(String[] args) {
  Random r = new Random();
  r.test();
 }

 public void test() {
  System.out.println(Logger.getRef(this));
 }

}

class Logger {

 public static String getRef(Object object) {
  StackTraceElement[] elements = Thread.currentThread().getStackTrace();
  String method = "";
  method = elements[2].getMethodName();
  return "[" + object.getClass().getSimpleName() + "::" + method + "()]";
 }

}

Out: [Random::test()]

Upvotes: 2

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