android 开发学习笔记 （一）

1. 每个app 都有一个自己的 linux 进程；


2. 每个进程都在自己的虚拟机里执行


3. 两个app 可以跑在一个进程，一个vm里


4. android app
   四大组件：activity，content provider,      services,
   broardcast receivers


5. Content
   Resolver 激活 Content Provider

• You
  can start an      activity (or give it something new
  to do) by passing an Intent
  to startActivity()
  or startActivityForResult()
  (when you want      the activity to return a
  result).


• You
  can start a      service (or give new instructions
  to an ongoing service) by passing an Intent
  to startService().
  Or you can      bind to the service by passing an
  Intent
  to bindService().


• You
  can initiate      a broadcast by passing an
  Intent
  to methods like      sendBroadcast(),
  sendOrderedBroadcast(),
  or sendStickyBroadcast().


• You
  can perform      a query to a content provider by
  calling query()
  on a ContentResolver.

From
<http://developer.android.com/guide/components/fundamentals.html>

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