How android translate kernel input events to userland input events锛

by Dianne Hackborn » Fri, 23 Oct 2009 11:56:40 GMT

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 You can't handle input events in native code, the framework takes care of
that and you will break things if you fight with it (and can't anyway
because you shouldn't have permission to open the driver).
You can look at EventHub.cpp and to see how the framework
transforms the raw driver events into the MotionEvent and KeyEvent objects
your app receives, but you can't do anything like that in an application.

Dianne Hackborn
Android framework engineer

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.


How android translate kernel input events to userland input events锛

by ZaichengQi » Fri, 23 Oct 2009 12:33:54 GMT

 Thanks for your help. I know that I can get root privilege only on my
dev phone, and I will not try to really handle these events by myself.


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2. Rendering problems with an Activity having android:screenOrientation="landscape"

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I have a regular list with a list of names. When I pick one name, I
need to show it on the screen with the largest font size (they are
supposed to be made available for reading by the phone owner to other
people). On this purpose, I activate a new Activity that declares
android:screenOrientation="landscape" so it can take advantage of the
wider screen available. The Activity has also the FullScreen style.

It works, but for a couple of rendering details. First, the "slide in
screen" effect that I've configured on my Droid doesn't work - the
activity is rendered without any effect. Second, for a glimpse there
are foreign contents on the screen (they are parts of the last
notification screen that I opened). I presume it's a problem of the
frame buffer off-screen contents being not properly managed. If the
problem is not clear, I can later post a link to a short video.

If I start with the regular list already in landscape mode (because I
rotated the phone) everything works fine. The problem seems to be
transitioning from an activity in portrait mode directly to an
activity in landscape mode.
I guess I've hit a known bug...

I was thinking of trying the following thing:

1. Drop the android:screenOrientation="landscape" setting in the
2. Keep the widgets on the Activity initially not visible, so a blank
activity slides in.
3. After a short delay, programmatically switching to landscape mode
and set the widgets visible
4. When quitting the activity, run the reverse steps (setting the
widgets to not visible, programmatically switching to portrait mode,
waiting for a short delay, finishing).

Thoughts? Better workarounds? Thanks.

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