Multiple Android project source code-covering every aspect worth learning

Android PDF Reader http://sourceforge.net/projects/andpdf/files/
Personal Bookkeeping Tool Onmymeanshttp://sourceforge.net/projects/onmymeans/develop
Android Battery Monitor Android Battery doghttp://sourceforge.net/projects/andbatdog/
RSS Reader software Android rsshttp://code.google.com/p/android-rss/
Android PDF Reader droidreaderhttp://code.google.com/p/droidreader/
Android Scripting environmenthttp://code.google.com/p/android-scripting/
Android Mini game Android shapeshttp://sourceforge.net/projects/shapes/
Android JSON rpchttp://code.google.com/p/android-json-rpc/
Android vnchttp://code.google.com/p/android-vnc/
Meizu M8 Android Transplant M8 androidhttp://code.google.com/p/m8-android-kernel/
Android Game Amazedhttp://code.google.com/p/apps-for-android/
Android's social network HelloWorld goes mobilehttp://sourceforge.net/projects/helloworldgm/
Mobile Phone Chat program Android Jchathttp://code.google.com/p/jchat4android/
Android GPS track record mytrackshttp://code.google.com/p/mytracks/
Android Chess game Honzovy achyhttp://sourceforge.net/projects/honzovysachy/
Android Travel history Software andtriploghttp://sourceforge.net/projects/andtriplog/
Music player ambienthttp://sourceforge.net/projects/ambientmp/
Android Mail client k9mailhttp://code.google.com/p/k9mail/
Multi-platform Application development Library quickconnecthttp://sourceforge.net/projects/quickconnect/
Gphone Mobile Air Combat game http://code.google.com/p/wireless-apps/
Android Photo Small software Panoramiohttp://code.google.com/p/apps-for-android/
i-jettyhttp://code.google.com/p/i-jetty/
Android Mini Game Divideandconquerhttp://code.google.com/p/apps-for-android/
Android Global Time Androidglobaltimehttp://code.google.com/p/apps-for-android/
Android 2D game engine Android anglehttp://code.google.com/p/angle/
Android rubyhttp://code.google.com/p/android-ruby/
android-n810http://sourceforge.net/projects/android-n810/
Android SMS App Ecclesiahttp://sourceforge.net/projects/ecclesia
Jxta client Peerdroidhttp://code.google.com/p/peerdroid/on the Android platform
Android game engine libgdxhttp://code.google.com/p/libgdx/
Android Photo Small software Photostreamhttp://code.google.com/p/apps-for-android/
Alien3d logo Android 3D game engine alien3dhttp://code.google.com/p/alien3d/
Winamp Remote Android serverhttp://sourceforge.net/projects/winampdroid
Android's Facebook client andricohttp://code.google.com/p/andrico/
Android Applications managerhttp://sourceforge.net/projects/aam/
Java 3D Graphics Engine catcakehttp://code.google.com/p/catcake/
android-gcc-objc2-0http://code.google.com/p/android-gcc-objc2-0/
Nine Gongge Sudoku game Opensudokuhttp://code.google.com/p/opensudoku-android/
Android Ringtone Extension tool Ringsextendedhttp://code.google.com/p/apps-for-android/
Javaeye Android clienthttp://code.google.com/p/javaeye-android-client/
Remotedroidhttp://code.google.com/p/remotedroid/
Android Mini Game Clickin2dabeathttp://code.google.com/p/apps-for-android/
zz-doctorhttp://code.google.com/p/zz-doctor/of Assistant information system of TCM doctor
Facebook Connect for Androidhttp://code.google.com/p/fbconnect-android/
Android smspopuphttp://code.google.com/p/android-smspopup/
Freetts-androidhttp://sourceforge.net/projects/freettsandroidi
Foursquare.com Client-side foursquarhttp://code.google.com/p/foursquared/
Barcode Scanning Instrument  android pc_bcrhttp://code.google.com/p/android-pcbcr/