widget development

Mastering Android Widget Development - Part1

SDK Version: 

In Days to Xmas tutorial you can see a simple widget example, which demonstrates what widgets are used for, and shows an example how they can work. Now I begin a series of tutorials to fully explain the working of widgets.
We will also create a sample application, during the tutorials, which will show a countdown to a given date in secunds, but things that are not required for this specific example applications will be explained too.

For this first part I will go though mainly the parts described in http://developer.android.com/guide/topics/appwidgets/index.html but I try to give more explanation and advice.

Some general thoughts at first:

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