[Android] Application Business Model

1. Paid Applications: Note. Unconditional Refund in 24 Hours 
2. Advertisement: 
2.1 ADMob (Acquired by Google)
2.2 Google AdSense for Mobile Applications  (not public, need high download ap)

2.3 mobclix

3. Donation (e.g., Paypal)

[] http://www.programmer.com.cn/2038/
[] 如何在 Android 程式中置入 AdMob 廣告？
[] http://ysl-paradise.blogspot.com/2010/04/android.html