CoordinatorLayout properly restoring the Behavior states on API < 13 by avoiding null ClassLoaders

SafeCoordinatorLayout.java

package be.digitalia.common.widgets;

import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.os.ParcelableCompat;
import android.support.v4.os.ParcelableCompatCreatorCallbacks;
import android.util.AttributeSet;

/**
 * CoordinatorLayout properly restoring the Behavior states on API < 13 by avoiding null ClassLoaders.
 *
 * @author Christophe Beyls
 */
public class SafeCoordinatorLayout extends CoordinatorLayout {

	public SafeCoordinatorLayout(Context context) {
		super(context);
	}

	public SafeCoordinatorLayout(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public SafeCoordinatorLayout(Context context, AttributeSet attrs, int defStyleAttr) {
		super(context, attrs, defStyleAttr);
	}

	@Override
	protected Parcelable onSaveInstanceState() {
		final Parcelable superState = super.onSaveInstanceState();
		if (superState instanceof CoordinatorLayout.SavedState) {
			return new SavedState((CoordinatorLayout.SavedState) superState);
		}
		return superState;
	}

	@Override
	protected void onRestoreInstanceState(Parcelable state) {
		if (state instanceof SavedState) {
			final SavedState ss = (SavedState) state;
			super.onRestoreInstanceState(ss.wrappedState);
		} else {
			super.onRestoreInstanceState(state);
		}
	}


	protected static class SavedState implements Parcelable {

		final CoordinatorLayout.SavedState wrappedState;

		public SavedState(Parcel source, ClassLoader loader) {
			if (loader == null) {
				loader = CoordinatorLayout.class.getClassLoader();
			}
			wrappedState = new CoordinatorLayout.SavedState(source, loader);
		}

		public SavedState(CoordinatorLayout.SavedState state) {
			wrappedState = state;
		}

		@Override
		public int describeContents() {
			return wrappedState.describeContents();
		}

		@Override
		public void writeToParcel(Parcel dest, int flags) {
			wrappedState.writeToParcel(dest, flags);
		}

		public static final Parcelable.Creator<SavedState> CREATOR
				= ParcelableCompat.newCreator(new ParcelableCompatCreatorCallbacks<SavedState>() {
			@Override
			public SavedState createFromParcel(Parcel in, ClassLoader loader) {
				return new SavedState(in, loader);
			}

			@Override
			public SavedState[] newArray(int size) {
				return new SavedState[size];
			}
		});
	}
}