Is it possible to create android homescreen widgets using phonegap ?
It's defiantly possible. But yes you will need to be writing native code and have an understanding of Java/Android.
And any updating the widget needs to do, refreshing from a web service, will need to be written in Java/Android. As you can not talk to the javascript from the Service required to update the widget.
According to various posts on the PhoneGap's Google Group it doesn't seem to be possible, at least not without heavily modifying the core.
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