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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.view;

import android.view.ViewConfiguration;

/**
 * Helper for accessing features in {@link ViewConfiguration}
 * introduced after API level 4 in a backwards compatible fashion.
 */
public class ViewConfigurationCompat {
    /**
     * Interface for the full API.
     */
    interface ViewConfigurationVersionImpl {
        public int getScaledPagingTouchSlop(ViewConfiguration config);
    }

    /**
     * Interface implementation that doesn't use anything about v4 APIs.
     */
    static class BaseViewConfigurationVersionImpl implements ViewConfigurationVersionImpl {
        @Override
        public int getScaledPagingTouchSlop(ViewConfiguration config) {
            return config.getScaledTouchSlop();
        }
    }

    /**
     * Interface implementation for devices with at least v11 APIs.
     */
    static class FroyoViewConfigurationVersionImpl implements ViewConfigurationVersionImpl {
        @Override
        public int getScaledPagingTouchSlop(ViewConfiguration config) {
            return ViewConfigurationCompatFroyo.getScaledPagingTouchSlop(config);
        }
    }

    /**
     * Select the correct implementation to use for the current platform.
     */
    static final ViewConfigurationVersionImpl IMPL;
    static {
        if (android.os.Build.VERSION.SDK_INT >= 11) {
            IMPL = new FroyoViewConfigurationVersionImpl();
        } else {
            IMPL = new BaseViewConfigurationVersionImpl();
        }
    }

    // -------------------------------------------------------------------

    /**
     * Call {@link ViewConfiguration#getScaledPagingTouchSlop()}.
     * If running on a pre-{@link android.os.Build.VERSION_CODES#FROYO} device,
     * returns {@link ViewConfiguration#getScaledTouchSlop()}.
     */
    public static int getScaledPagingTouchSlop(ViewConfiguration config) {
        return IMPL.getScaledPagingTouchSlop(config);
    }
}