I recently acquired Samsung Galaxy S android device. Thanks to zahari for ‘meracun’(poisoning) me.
I try search for Koha on android and found several articles and application on it.
1. Kiritaki Koha.

It is an android application (beta version) developed by Catalyst IT of New Zealand. The application can do simple and advance search from android device. It also use barcode scanner to scan for ISBN and make the search in Koha OPAC. Upon search results user can place hold (reservation) to the book, specify pickup date and which branch to collect.
However, the application still can be improve further especially in linking with user accounts. Maybe developer can add more user oriented functions such as user can do item renewal, check their fines and overdue, and loaned items. Currently it does not have administration functions, maybe due to target group of the application. For a librarian perhaps, librarian can do inventory (by scanning item barcodes) via android device or perhaps mobile check in and check out features (we might consider security features). Just my 2cents thought. To install Kiritaki Koha, just search koha in android market. Select Kiritaki Koha and Install. It cost you FREE.
2. Using barcode scanner.
Nicholas Morin wrote on Biblibre website on how to use Customize Search in Android barcode scanner to scan ISBN and search from Koha (3.x) OPAC. You’ll need to install barcode scanner from android market cost $0). Full article can be access here: http://www.biblibre.com/en/blog/entry/koha-on-android.
To search ISBN from Android Barcode Scanner apps, just follow these simple steps:
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Install Barcode Reader app from the Android store ($0)
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Open the app and go Menu > Settings.
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In ‘Custom product search
URL‘ and enter http://<your server>/cgi-bin/koha/opac-search.pl?idx=nb&q=%s
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OK and exit.
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Scan an item with an ISBN barcode.
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Enjoy.