public static Method findMethodExact(String className, ClassLoader classLoader, String methodName, Object... parameterTypes) {
        return findMethodExact(findClass(className, classLoader), methodName, getParameterClasses(classLoader, parameterTypes));
    }
Look up a method in a class and set it to accessible.
The method must be declared or overridden in the given class.

<p>See {@link #findAndHookMethod(String, ClassLoader, String, Object...)} for details about
the method and parameter type resolution.

@param className      The name of the class which implements the method.
@param classLoader    The class loader for resolving the target and parameter classes.
@param methodName     The target method name.
@param parameterTypes The parameter types of the target method.
@return A reference to the method.
@throws NoSuchMethodError  In case the method was not found.
@throws ClassNotFoundError In case the target class or one of the parameter types couldn't be resolved.
android/android_framework/base/src/main/java/util/XposedHelpers.java