题目内容
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.
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There are two lifecycle methods that handle when the activity is pausedand when it becomes active again: onPause() and onRestart().
When you add images to your apps，which folder should you add each file to ? __________ (in one word)
When you want to get items in a list view to respond to clicks, you need to create an OnItemClickListener and implement its ________ method.
Once you've created the OnClickItemListener, you need to attach it to the list view. You do this using the ListView________method.
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