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Android Programming: The Big Nerd Ranch Guide by Brian Hardy, Bill Phillips

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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

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 ...

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