A custom ViewFlipper to dinamically add views at runtime without render-loss time
The RecyclerViewFlipper is a Custom ViewFlipper that allows you to scroll between an infinite number of Views without render-loss time. The component stores a double-ended queue (deque) in order to pre-load the views that need to be shown. In this way, you could dinamically add an infinite (we suppose to!) odd number of views without wasting your time in pre-rendering phases while scrolling. The RecyclerViewFlipper also supports animations as its superclass ViewFlipper, and distorts the way of seeing the views since they are handled as a stack, but stored as a deque. This library also avoids OutOfMemory errors due to a lot of views loaded inside the ViewFlipper, because in this case the views are added at runtime with a fixed number of loaded views per time.
In your layout:
<it.mls.recyclerviewflipper.RecyclerViewFlipper
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/buttonContainer"
android:id="@+id/viewFlipper" >
</it.mls.recyclerviewflipper.RecyclerViewFlipper>
and in your Java file:
View firstView = View.inflate(this, FIRST_VIEW, null);
View secondView = View.inflate(this, SECOND_VIEW, null);
View thirdView = View.inflate(this, THIRD_VIEW, null);
ArrayList<View> views = new ArrayList<>();
views.add(firstView);
views.add(secondView);
views.add(thirdView);
mRecyclerViewFlipper = (RecyclerViewFlipper<View>) findViewById(ID_VIEWFLIPPER);
mRecyclerViewFlipper.initializeComponents(views);
mRecyclerViewFlipper.setRecycleViewFlipperRequest(this);
your activity must implement RecyclerViewFlipperRequest<T> , where T could be a class that inherits from View and these two methods deal the runtime generation of the dynamic view
@Override
public View requestLeftItem() {
View newView = View.inflate(this, SECOND_VIEW, null);
Button btn = (Button) newView.findViewById(R.id.btn);
btn.setText(String.valueOf(mCounter++));
return newView;
}
@Override
public View requestRightItem() {
View newView = View.inflate(this, SECOND_VIEW, null);
Button btn = (Button) newView.findViewById(R.id.btn);
btn.setText(String.valueOf(mCounter--));
return newView;
}
In this example I've inflated the same view changing the content of the button, but you can do it in very different ways, like putting it inside a Stack while you process it and so on.
Keep in mind that the preprocessing deque is defined when you call mRecyclerViewFlipper.initializeComponents(views);
the queue will keep a number of K views per time, where K is the size of the List
If you want to see an example of the library in action, please watch a demo here