Intents are probably Android’s most powerful tool. They tie together loosely coupled components and make it possible to start Activities that are not part of your own app. Using intents you can delegate to the Contacts app to select a contact or you can start the browser, share data and so on. The receiving apps declare intent filters which describe the intents its component react to. If you know which intent filters the app provides and if the components are publicly available you can start any Activity of any app on the users device.

在同一台电脑上有多个github账户时，切换ssh key会比较麻烦，可以使用ssh config来简化这一动作。 在使用ssh-keygen时，

没有什么比漫无目的的徘徊更让人心烦意乱，消磨意志的了，最近就处于这样一种状态。Android开发基础已经基本上掌握了，但是高级点的技巧依然无