plemas.blogg.se

Add an image to the drawable folder, then set it as the background of the root view.

Doing so is a common cause of errors when working with fragments. Use an image as the background of the Hello Toast app. As you have noticed, when a fragment is added to the FragmentManager, it will be recreated for you after rotating and there is no need to add it again. Toast toast Toast.makeText(context, message, duration) View view toast.getView() //Gets the actual oval background of the Toast then sets the colour.

All of this comes free when using the FragmentPagerAdapter and is why it is usual to have your fragment initialisation code inside the getItem(int) method.Įven if we were not using a FragmentPagerAdapter, it is not a good idea to create a new fragment every single time in Activity.onCreate(Bundle). After rotating, Android will notice that it already created/saved a fragment for this particular position and so it simply tries to reconnect with it with FragmentManager.findFragmentByTag(), instead of creating a new one. FragmentPagerAdapter.getItem(int position) is only called when a fragment for that position does not exist. When the FragmentPagerAdapter adds a fragment to the FragmentManager, it uses a special tag based on the particular position that the fragment will be placed.