I have Log.i statements in the program .but nothing is showing up!

Absolutely nothing? Than should it be a bug I experience sometimes too. Just restart the Emulator and Eclipse and the LogCat should work again.

The other possibility: Its just not executed by your program

tried many times to run but in vain ,but once i restarted it,logcat started showing the flow

I'm not sure if this will help, but sometimes running the app in debug mode first, then running it in normal mode fixes that for me.