Android Development Learning Notes (i)

2. each app have one of their own Linux process;
4. Each process is executed in its own virtual machine.
6. two app can run in a process, a vm
8. Android App Four components: Activity , content provider, services, Broardcast receivers
10. Content Resolver Activate 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 anIntent toStartService (). Or you can bind to the service by passing anIntent toBindservice ()
• you can initiate      a broadcast by passing an intent to methods like      sendbroadcast () Span style= "Color:rgb (34, 34, 34); Font-family:simsun; font-size:10.5pt; " >, sendorderedbroadcast () , or sendstickybroadcast () .
• You can perform a query to a content provider by calling query () On a Contentresolver .

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