Hosting a UI Fragment
To host a UI fragment, an activity must
define a spot in its layout for the fragment’s view
manage the lifecycle of the fragment instance
The fragment lifecycle
Figure 7.11 shows the fragment lifecycle. It is similar to the activity lifecycle: it has stopped, paused, and running states, and it has methods you can override to get things done at critical points – many of which correspond to activity lifecycle methods.
Figure 7.11 Fragment lifecycle diagram
The correspondence is important. Because a fragment works on behalf of an activity, its state should reflect the activity’s state. Thus, it needs corresponding lifecycle methods ...