What do the Android Studio HPROF reference tree element colours represent?

Question

Can someone tell me what does bold, blue one and red one positions in HPROF Viewer in Android Studio means exactly ?

I ask about one in Reference Tree panel.

Answer 1

• this$0 (the red one) - is the variable which holds the reference to LeakActivity. In your case this is an implicit reference to the enclosing class. This is a nature of anonymous inner classes in Java - they implicitly hold a reference to the outer (enclosing) class.

• blue class name - is just a location of this$0 variable.

So essentially what you are seeing - is LeakActivity is implicitly referenced from LeakAsyncTask which is implemented as anonymous inner class within LeakActivity, so LeakActivity cannot be garbage collected until LeakAsyncTask is finished. So you have a potential Activity leak which is really dangerous for your app