It's a thunk to allow an inner class to call a private method (or access a private variable) on its containing class.
I've started getting in the habit of going through code and getting rid of private methods and variables from these core system classes, to get rid of such thunks, but that does have the unfortunately side-effect of not allowing Eclipse to show you unnused methods and variables. Compromises, compromises. 2009/8/25 Brian <[email protected]> > > Thanks for the reply. I understand that the $ sign is normally used to > denote a nested/inner class. > > In the above example (ActivityThread.java - > > http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=core/java/android/app/ActivityThread.java;h=d8161936a44d10ac1fac01fecb583c76190b1730;hb=76eef491e1a453174f6372d18cf500d13521fb23 > ) > > android.app.ActivityThread$H.handleMessage > > Refers to the H class, which is nested in ActivityThread.java: > > 1621 private final class H extends Handler {....} > > However, as for > > at android.app.ActivityThread.handleDestroyActivity > (ActivityThread.java:3180) > at android.app.ActivityThread.access$2500(ActivityThread.java:115) > at android.app.ActivityThread$H.handleMessage(ActivityThread.java: > 1745) > > I still don't understand fully what it can mean. > > Looking at the source code (line number a bit off due to diff. > version): > > (in function H.handleMessage) > 1723 case DESTROY_ACTIVITY: > 1724 handleDestroyActivity((IBinder)msg.obj, > msg.arg1 != 0, > 1725 msg.arg2, false); > 1726 break; > > This is the section of interest. So I get ActivityThread > $H.handleMessage (handleMessage function of class H nested inside > ActivityThread). > > However, I don't get ActivityThread.access$2500 for a couple reasons: > > 1. Line number points to beginning of the ActivityClass > 2. ActivityThread.access seems to refer to a function name, but > there's no "access" function > 3. access$2500 (so is access a function or class) and I have no idea > what the number 2500 means > 4. I would also like to know how the number 2500 is generated (is it > random? depends on task #?) > > I tried using DDMS on a similar code, thinking that maybe (IBinder) > msg.obj casting is referring to it. But when I stepped through a > similar code (object casting), I didn't see "access$2500" or anything > similar to it. It just jumped straight on to the function being > called. > > I tried googling it, but to no avail... > > > > On 8월25일, 오후1시08분, Streets Of Boston <[email protected]> wrote: > > The $ is used to seperate the inner class from the main class; > > > > Example: > > > > packager a.b.c > > > > public class MyClass { > > ... > > static class OtherClass { > > void someMethod() { > > ... > > exception.printStackTrace(); > > ... > > } > > ... > > } > > ... > > > > } > > > > would print out as ' at a.b.c.MyClass$OtherClass.someMethod > > (MyClass.java:322)' > > > > I'm not sure about the '2500'. It could be an anonymous class..? > > > > public void accessExample() { > > Runnable r = new Runnable() { > > public void run() { ... } > > }; > > ... > > } > > > > where the class of the instance 'r' is anonymous and compiled as > > '2500'. > > > > On Aug 25, 11:47 am, Brian <[email protected]> wrote: > > > > > > > > > Hi all, > > > > > I wanted to understand what the $ sign and the number after a $ sign > > > meant in a backtrace. > > > > > For example, consider the following backtrace: > > > > > at android.app.ActivityThread.access$2500(ActivityThread.java:115) > > > at android.app.ActivityThread$H.handleMessage(ActivityThread.java: > > > 1745) > > > > > In the first line, what does the number 2500 refer to? In addition, I > > > couldn't find the function "access" in ActivityThread.java, and line > > > 115 is just the beginning of the class. Can anyone help clarify this? > > > Thanks!- 원본 텍스트 숨기기 - > > > > - 원본 텍스트 보기 - > > > -- Dianne Hackborn Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
