Useful link on Android App development

Platform Version Distribution
http://developer.android.com/about/dashboards/index.html#Platform

Say goodbye to menu button
http://android-developers.blogspot.hk/2012/01/say-goodbye-to-menu-button.html

Icon size
http://developer.android.com/design/style/iconography.html
android offical icon download
http://developer.android.com/design/downloads/index.html

Android version and API levels list
http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels

Action Bar
http://developer.android.com/design/patterns/actionbar.html
http://docs.appcelerator.com/titanium/3.0/#!/guide/Android_Action_Bar

Supporting multiple screens
http://developer.android.com/guide/practices/screens_support.html

use density-specific images in titanium project
http://docs.appcelerator.com/titanium/3.0/#!/guide/Using_density-specific_resources_on_Android

Titanium Studio - DDMS perspective
https://wiki.appcelerator.org/display/tis/Installing+the+Android+Development+Tools#InstallingtheAndroidDevelopmentTools-AddtheDDMSperspectivebutton


Use Genymotion with Ti SDK 3.1.3 Step-by-step
http://developer.appcelerator.com/question/154253/there-must-be-a-way-to-use-the-new-genymotion-emulator#269553

App Signing
http://developer.android.com/tools/publishing/app-signing.html
App need to be signed before it can be run on emulator. May sign in debug mode for testing purpose:

The SDK tools create the debug keystore/key with predetermined names/passwords:

• Keystore name: "debug.keystore"
• Keystore password: "android"
• Key alias: "androiddebugkey"
• Key password: "android"
• CN: "CN=Android Debug,O=Android,C=US"