题目内容
It's possible to add music to the output audio flow during a phone call.
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An adapter acts as a bridge between the data source and the list view.
If the fragment code contains all that you need to control its layout, it greatly increases the chances that you'll be able to reuse it elsewhere in the app.
The fragment implements the onCreateView() method, which gets called each time Android needs the fragment’s layout, and it’s where you say which layout the fragment uses.
The onCreate() method gets called when the database needs to be upgraded.
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