/**
* Saves {@link RestorableViewState} in a bundle. <b>Should be called from View
* onSaveInstanceState(Parcelable) method</b>
*/
public Parcelable saveViewState(Parcelable superState) {
MvpViewStateViewGroupDelegateCallback delegate =
(MvpViewStateViewGroupDelegateCallback) delegateCallback;
boolean retainingInstanceState = delegate.isRetainInstance();
ViewState viewState = delegate.getViewState();
if (viewState == null) {
throw new NullPointerException("ViewState is null! That's not allowed");
}
if (retainingInstanceState) {
// For next time we call applyViewState() we have to set this flag to true
applyViewState = true;
return null;
} else {
ViewStateSavedState state = new ViewStateSavedState(superState);
state.setMosbyViewState((RestorableParcelableViewState) delegate.getViewState());
return state;
}
}
/**
* Like the name already suggests. Creates a new viewstate or tries to restore the old one (must
* be subclass of {@link RestorableViewState}) by reading the bundle
*
* @return true, if the viewstate has been restored (in other words restored from parcelable)
* (calls {@link BaseMvpViewStateDelegateCallback#onViewStateInstanceRestored(boolean) after
* having restored the viewstate}. Otherwise returns false and calls {@link
* BaseMvpViewStateDelegateCallback#onNewViewStateInstance()}
*/
public boolean createOrRestoreViewState(ViewStateSavedState savedState) {
if (createOrRestoreCalled) {
return false;
}
createOrRestoreCalled = true;
MvpViewStateViewGroupDelegateCallback delegate =
(MvpViewStateViewGroupDelegateCallback) delegateCallback;
// ViewState already exists
if (delegate.getViewState() != null) {
applyViewState = true;
return false;
}
if (savedState != null) {
ViewState viewState = savedState.getMosbyViewState();
delegate.setViewState(viewState);
boolean restoredFromBundle = delegate.getViewState() != null;
if (restoredFromBundle) {
applyViewState = true;
return true;
}
}
// Create view state
delegate.setViewState(delegate.createViewState());
if (delegate.getViewState() == null) {
throw new NullPointerException(
"ViewState is null! Do you return null in createViewState() method?");
}
// ViewState not restored, activity / fragment starting first time
applyViewState = false;
return false;
}