题目内容
The onCreate() method gets called when the database needs to be upgraded.
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You add data to the ContentValues object using its putExtra() method.
To insert multiple rows into a table, you need to make repeat calls to the insert() method.
To use the Handler, you wrap the code you wish to schedule in a Runnable object, and then use the Handler post() and postDelayed() methods to specify when you want the code to run.
There are two lifecycle methods that handle when the activity is pausedand when it becomes active again: onPause() and onRestart().
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