Google 今天正式推出 In-App Purchase.
Today, we’re pleased to announce the launch of Android Market In-app Billing to developers and users. As an Android developer, you will now be able to publish apps that use In-app Billing and your users can make purchases from within your apps.
有部份 Apps 已经配置了 In-App Purchase，包括 Tap Tap Revenge, Gun Bros, Deer Hunter Challenge HD, Dungeon Defenders 等。
就像 Market 买 App 一样
In-App Purchase 操作十分简单，就在程式内按相关按键，就会出现如 Market 那样的购买画，跟着用信用咭付款便可。随即会返回程式内继续，十分方便！
下面的两张图就是 Gun Bros 内购买武器的情况。当在游戏中按下按键，就会有一个视窗弹出，接着就是熟悉的 Market 购买接口，只要按下最下方的［立即购买］便可以。
资料来源： Android Developer Blog