some useful resource url

1. IETF RFC2119 Requirement Levels: http://www.ietf.org/rfc/rfc2119.txt
2. Android Compatibility Program Overview: http://source.android.com/compatibility/index.html
3. Android Open Source Project: http://source.android.com/
4. API definitions and documentation: http://developer.android.com/reference/packages.html
5. Android Permissions reference: http://developer.android.com/reference/android/Manifest.permission.html
6. android.os.Build reference: http://developer.android.com/reference/android/os/Build.html
7. Android 2.3 allowed version strings: http://source.android.com/compatibility/2.3/versions.html
8. android.webkit.WebView class: http://developer.android.com/reference/android/webkit/WebView.html
9. HTML5: http://www.whatwg.org/specs/web-apps/current-work/multipage/
10. HTML5 offline capabilities: http://dev.w3.org/html5/spec/Overview.html#offline
11. HTML5 video tag: http://dev.w3.org/html5/spec/Overview.html#video
12. HTML5/W3C geolocation API: http://www.w3.org/TR/geolocation-API/
13. HTML5/W3C webdatabase API: http://www.w3.org/TR/webdatabase/
14. HTML5/W3C IndexedDB API: http://www.w3.org/TR/IndexedDB/
15. Dalvik Virtual Machine specification: available in the Android source code, at dalvik/docs
16. AppWidgets: http://developer.android.com/guide/practices/ui_guidelines/widget_design.html
17. Notifications: http://developer.android.com/guide/topics/ui/notifiers/notifications.html
18. Application Resources: http://code.google.com/android/reference/available-resources.html
19. Status Bar icon style guide: http://developer.android.com/guide/practices/ui_guideline /icon_design.html#statusbarstructure
20. Search Manager: http://developer.android.com/reference/android/app/SearchManager.html
21. Toasts: http://developer.android.com/reference/android/widget/Toast.html
22. Live Wallpapers: http://developer.android.com/resources/articles/live-wallpapers.html
23. Reference tool documentation (for adb, aapt, ddms): http://developer.android.com/guide/developing/tools/index.html
24. Android apk file description: http://developer.android.com/guide/topics/fundamentals.html
25. Manifest files: http://developer.android.com/guide/topics/manifest/manifest-intro.html4
26. Monkey testing tool: http://developer.android.com/guide/developing/tools/monkey.html
27. Android Hardware Features List: http://developer.android.com/reference/android/content/pm/PackageManager.html
28. Supporting Multiple Screens: http://developer.android.com/guide/practices/screens_support.html
29. android.util.DisplayMetrics: http://developer.android.com/reference/android/util/DisplayMetrics.html
30. android.content.res.Configuration: http://developer.android.com/reference/android/content/res/Configuration.html
31. Sensor coordinate space: http://developer.android.com/reference/android/hardware/SensorEvent.html
32. Bluetooth API: http://developer.android.com/reference/android/bluetooth/package-summary.html
33. NDEF Push Protocol: http://source.android.com/compatibility/ndef-push-protocol.pdf
34. MIFARE MF1S503X: http://www.nxp.com/documents/data_sheet/MF1S503x.pdf
35. MIFARE MF1S703X: http://www.nxp.com/documents/data_sheet/MF1S703x.pdf
36. MIFARE MF0ICU1: http://www.nxp.com/documents/data_sheet/MF0ICU1.pdf
37. MIFARE MF0ICU2: http://www.nxp.com/documents/short_data_sheet/MF0ICU2_SDS.pdf
38. MIFARE AN130511: http://www.nxp.com/documents/application_note/AN130511.pdf
39. MIFARE AN130411: http://www.nxp.com/documents/application_note/AN130411.pdf
40. Camera orientation API: http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)
41. android.hardware.Camera: http://developer.android.com/reference/android/hardware/Camera.html
42. Android Security and Permissions reference: http://developer.android.com/guide/topics/security/security.html
43. Apps for Android: http://code.google.com/p/apps-for-android