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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.app;

import android.content.Context;
import android.os.Parcelable;
import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;

/**
 * Pre-Honeycomb versions of the platform don't have {@link View#setSaveFromParentEnabled(boolean)},
 * so instead we insert this between the view and its parent.
 */
class NoSaveStateFrameLayout extends FrameLayout {
    static ViewGroup wrap(View child) {
        NoSaveStateFrameLayout wrapper = new NoSaveStateFrameLayout(child.getContext());
        ViewGroup.LayoutParams childParams = child.getLayoutParams();
        if (childParams != null) {
            wrapper.setLayoutParams(childParams);
        }
        NoSaveStateFrameLayout.LayoutParams lp = new NoSaveStateFrameLayout.LayoutParams(
                ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
        child.setLayoutParams(lp);
        wrapper.addView(child);
        return wrapper;
    }
    
    public NoSaveStateFrameLayout(Context context) {
        super(context);
    }
    
    /**
     * Override to prevent freezing of any child views.
     */
    @Override
    protected void dispatchSaveInstanceState(SparseArray container) {
        dispatchFreezeSelfOnly(container);
    }

    /**
     * Override to prevent thawing of any child views.
     */
    @Override
    protected void dispatchRestoreInstanceState(SparseArray container) {
        dispatchThawSelfOnly(container);
    }
}