2.App Components-Activities/Loadres
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时间：2015年06月11日
1. Loaders
loaders make it easy to asynchronously load data in an activity or fragment. Loaders have these characteristics:
<1>They are available to every Activity and Fragment.
<2>They provide asynchronous loading of data
<3>They monitor the source of their data and deliver new results when the content changes
<4>They automatically reconnect to the last loader‘s cursor when being recreated after a configuration change. Thus, they don‘t need to
re-query their data
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