Is there a free way to develop apps for my Galaxy Tab (Androind 2.2) using c#? Or are there only paid solutions?
Currently MonoDroid is the only CLR implementation on *Droid platforms so short answer is no. The cheapest solution would be get the student edition from MonoDroid store.
Edit: There is one open source implementation here but the reliability is doubtful: https://github.com/koush/androidmono
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With