To get started, your layout must include a {@link android.view.ViewGroup} in which you place each {@link android.app.Fragment} associated with a tab. Be sure the {@link android.view.ViewGroup} has a resource ID so you can reference it from your code and swap the tabs within it. -Alternatively, if the tab content will fill the activity layout, then your activity doesn't need a -layout at all (you don't even need to call {@link android.app.Activity#setContentView -setContentView()}). Instead, you can place each fragment in the default root view, which you can -refer to with the {@code android.R.id.content} ID.
- +Once you determine where the fragments appear in the layout, the basic procedure to add tabs is: