How many android apps are open source? [closed]

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I know that the android plattform is open source. What I am interested in is the share of open source Android apps, thus developers that realease their own apps under a open source license.

Does anybody have an idea, how to get this information?

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This post can give you a fair idea of the Open Source Software Projects of android

                                              New     Total OSS
                                            Projects    Mobile     Growth
OSS Projects Associated with a Platform      2009      Projects   '08-'09
-----------------------------------------  ---------- ---------- ---------
Android                                           224        357       168%
iPhone                                             76        252        43%
Windows Mobile                                     75        248        43%
Symbian                                            17        140        14%
Palm                                               10        527         2%
Maemo                                               9         27        50%
BlackBerry                                          4         39        11%
                                           ---------- ---------- ---------
     Sub Total                                    415       1590        35%
                                           ---------- ---------- ---------
Other OSS Mobile Projects                         488       1617        43%
                                           ---------- ---------- ---------
Total                                             903       3207        39%
                                           ---------- ---------- ---------

This table has been taken from here

This maybe worth reading too.

You can browse loads of Open Source Android Projects here