Getting the current application context

[Guy Rosen]

Hi,

I'm in need of a context object from inside framework code. The
framework code in question doesn't have access to a context because it
is by definition not loaded explicitly by an app, but rather is listed
in frameworks/base/preloaded-classes. Because apps never call it
directly, there is no obvious opportunity to pass a Context to it (it
is called indirectly as it is registered to be called from some
java.net classes).

This code seems to work, but I wonder if it's the Right Thing to do
and if there are consequences I'm not aware of (a similar snippet
appears in the GeolocationService ctor).

ActivityThread activityThread =
ActivityThread.currentActivityThread();
if (activityThread == null) {
Looper.prepare(); // in case this hasn't been called yet -
otherwise systemMain() fails
activityThread = ActivityThread.systemMain();
}
applicationContext = activityThread.getApplication();

Any thoughts?


Thanks,

- Guy.

[Dianne Hackborn]

There is no "current application context."  You should have the pass a context into you.  If you can't do that, the only thing you can safely rely on is a context for just the base platform without being associated with an application.

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[Guy Rosen]

Thanks Dianne!

You mention I can obtain a "context for just the base platform without
being associated with an application" - where can I obtain one of
those?

- Guy.

> > android-platfo...@googlegroups.com<android-platform%2Bunsubscrib e...@googlegroups.com>
> > .

> > For more options, visit this group at
> >http://groups.google.com/group/android-platform?hl=en.
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> Dianne Hackborn
> Android framework engineer

> hack...@android.com

[Dianne Hackborn]

ActivityThread.getSystemContext() I believe.

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[John Lombardo]

According to Mark Murphy, ActivityThread is no longer available in the SDK (and indeed I can't find it). See http://stackoverflow.com/questions/3317520/android-app-activitythread-is-missing-in-current-sdk

[Dianne Hackborn]

Yes, but this list isn't for discussion about programming against the SDK.

On Mon, Apr 18, 2011 at 4:36 PM, John Lombardo <john.l...@gmail.com> wrote:

According to Mark Murphy, ActivityThread is no longer available in the SDK (and indeed I can't find it). See http://stackoverflow.com/questions/3317520/android-app-activitythread-is-missing-in-current-sdk

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[jinde song]

I'm trying to get a context too.I 'm adding  features to my custom Rom. 

I just want to know if there is any bug this can raise?  

在 2010年9月28日星期二UTC+8下午11时51分01秒，Guy Rosen写道：