Why can WindowManager.LayoutParams.token be equal to ViewRootImpl.mWindow.asBinder?

Asked Dec 31 '15 at 08:55

Active Mar 24 '18 at 00:48

Viewed 203 times

In WindowManagerGlobal.addView, there is such a statement:

if (mRoots.get(i).mWindow.asBinder() == wparams.token)

I'm confuesd here. ViewRootImpl.mWindow is an instance of IWindow.stub, but WindowManager.LayoutParams.token is an instance of IApplicationToken.stub. How can they be equal?

Could anyone explain this?

edited Mar 24 '18 at 00:48

Onik

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asked Dec 31 '15 at 08:55

shhp

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`wparams.token` is an `IBinder` and `asBinder()` method returns `IBinder` – pskink Dec 31 '15 at 09:00
@pskink yes I know they are both `IBinder`. But they extends different `Binder` as I mentioned in the question. – shhp Dec 31 '15 at 09:40
so the `if` code will not be executed in that case... what is the issue? – pskink Dec 31 '15 at 09:43
@pskink then in what condition will the `if` statement be satisfied? – shhp Dec 31 '15 at 09:46
when you have the same object on the both sides of `==` operator – pskink Dec 31 '15 at 10:05

Why can WindowManager.LayoutParams.token be equal to ViewRootImpl.mWindow.asBinder?

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