In sencha touch, i built simple hello word program. it is working fine with browser but i don't no how to run this program in android emulator.
Basically there are 2 ways to do this:
Build your app as native Android app using Phonegap. Detailed instructions are provided at: http://phonegap.com/start#android
If you're using Sencha Touch 2, you can use it's build-in native Android packaging via Sencha SDK. See this: http://docs.sencha.com/touch/2-0/#!/guide/native_android