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The Support Package includes static "support libraries" that you can add to your Android application in order to use APIs that are either not available for older platform versions or that offer "utility" APIs that aren't a part of the framework APIs.

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/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.support.v4.os;

import android.os.Parcel;
import android.os.Parcelable;

/**
 * Helper for accessing features in {@link android.os.Parcelable}
 * introduced after API level 4 in a backwards compatible fashion.
 */
public class ParcelableCompat {

    /**
     * Factory method for {@link Parcelable.Creator}.
     *
     * @param callbacks Creator callbacks implementation.
     * @return New creator.
     */
    public static  Parcelable.Creator newCreator(
            ParcelableCompatCreatorCallbacks callbacks) {
        if (android.os.Build.VERSION.SDK_INT >= 13) {
            ParcelableCompatCreatorHoneycombMR2Stub.instantiate(callbacks);
        }
        return new CompatCreator(callbacks);
    }

    static class CompatCreator implements Parcelable.Creator {
        final ParcelableCompatCreatorCallbacks mCallbacks;

        public CompatCreator(ParcelableCompatCreatorCallbacks callbacks) {
            mCallbacks = callbacks;
        }

        @Override
        public T createFromParcel(Parcel source) {
            return mCallbacks.createFromParcel(source, null);
        }

        @Override
        public T[] newArray(int size) {
            return mCallbacks.newArray(size);
        }
    }
}