Android的每一個應用運行在一個安全的沙箱中：

1.系統給每個應用一個UserID，設置該ID對該應用的所有文件有操作權限。

2.每個應用都會創建一個獨立的VM。

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There are separate methods for activiting each type of component:

• 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.

轉載于:https://www.cnblogs.com/alwaysyouare/archive/2011/08/24/2152260.html

超強干貨來襲 云風專訪：近40年碼齡，通宵達旦的技術人生

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