Pancakes is a View-based navigation stack library for Android. While it does aim to replace some of FragmentManager's functionality, its feature set is not one-to-one with that of FragmentManager, as Views and Fragments are inherently different. Unlike FragmentManager, it also supports the use of Animators for View transitions.
compile 'me.mattlogan.pancakes:pancakes:3.1.0'Create a ViewStack instance with a ViewGroup container and a ViewStackDelegate:
ViewStack viewStack = ViewStack.create(container, this);Create a ViewFactory for each View:
public class RedViewFactory implements ViewFactory {
@Override
public View createView(Context context, ViewGroup container) {
return LayoutInflater.from(context).inflate(R.layout.view_red, container, false);
}
}Add a View to your container by pushing a ViewFactory:
viewStack.push(new RedViewFactory());Call pop() to go back one View:
viewStack.pop();Or, use an AnimatorFactory along with pushWithAnimation(ViewFactory, AnimatorFactory) and popWithAnimation(AnimatorFactory) to add remove a View with a transition animation.
public class CircularReveal implements AnimatorFactory {
@Override
public Animator createAnimator(View view) {
int cx = view.getWidth() / 2;
int cy = view.getHeight() / 2;
int finalRadius = Math.max(view.getWidth(), view.getHeight());
return ViewAnimationUtils.createCircularReveal(view, cx, cy, 0, finalRadius);
}
}You can also call peek() and peekView() to get the ViewFactory and View at the top of the navigation stack.
Add a StackChangedListener (or several!) if you want to be notified of changes in the navigation stack:
viewStack.addStackChangedListener(listener);You can also remove individual listeners with removeStackChangedListener(StackChangedListener) or remove all of them with clearStackChangedListeners().
Persist ViewFactory instances, in order, across configuration changes:
@Override
public void onSaveInstanceState(Bundle outState) {
viewStack.saveToBundle(outState, STACK_TAG);
super.onSaveInstanceState(outState);
}Rebuild the stack from a Bundle:
if (savedInstanceState != null) {
viewStack.rebuildFromBundle(savedInstanceState, STACK_TAG);
}Additionally, you may use View.onSaveInstanceState(Bundle) and View.onRestoreInstanceState(Bundle) to save the state of any View in the navigation stack so long as it has an ID.
Finally, implement ViewStackDelegate.finishStack() to take appropriate action when the stack is finished:
@Override
public void finishStack() {
finish();
}See the sample app for an example implementation.
Be careful: because ViewFactory instances are persisted across configuration changes,
you should not keep references in a ViewFactory to any objects that should be garbage collected
on a configuration change. Keep each ViewFactory as simple as possible.
Unit tests located in /library/src/test/
The MIT License (MIT)
Copyright (c) 2015 Matthew Logan
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