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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.View;
import android.view.View.AccessibilityDelegate;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;

/**
 * ICS specific AccessibilityDelegate API implementation.
 */
class AccessibilityDelegateCompatIcs {

    public interface AccessibilityDelegateBridge {
        public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event);
        public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event);
        public void onInitializeAccessibilityNodeInfo(View host, Object info);
        public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event);
        public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child,
            AccessibilityEvent event);
        public void sendAccessibilityEvent(View host, int eventType);
        public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event);
    }

    public static Object newAccessibilityDelegateDefaultImpl() {
        return new AccessibilityDelegate();
    }

    public static Object newAccessibilityDelegateBridge(final AccessibilityDelegateBridge bridge) {
        return new AccessibilityDelegate() {
            @Override
            public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
                return bridge.dispatchPopulateAccessibilityEvent(host, event);
            }

            @Override
            public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
                bridge.onInitializeAccessibilityEvent(host, event);
            }

            @Override
            public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
                bridge.onInitializeAccessibilityNodeInfo(host, info);
            }

            @Override
            public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
                bridge.onPopulateAccessibilityEvent(host, event);
            }

            @Override
            public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child,
                    AccessibilityEvent event) {
                return bridge.onRequestSendAccessibilityEvent(host, child, event);
            }

            @Override
            public void sendAccessibilityEvent(View host, int eventType) {
                bridge.sendAccessibilityEvent(host, eventType);
            }

            @Override
            public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) {
                bridge.sendAccessibilityEventUnchecked(host, event);
            }
        };
    }

    public static boolean dispatchPopulateAccessibilityEvent(Object delegate, View host,
            AccessibilityEvent event) {
        return ((AccessibilityDelegate) delegate).dispatchPopulateAccessibilityEvent(host, event);
    }

    public static void onInitializeAccessibilityEvent(Object delegate, View host,
            AccessibilityEvent event) {
        ((AccessibilityDelegate) delegate).onInitializeAccessibilityEvent(host, event);
    }

    public static void onInitializeAccessibilityNodeInfo(Object delegate, View host, Object info) {
        ((AccessibilityDelegate) delegate).onInitializeAccessibilityNodeInfo(host,
                (AccessibilityNodeInfo) info);
    }

    public static void onPopulateAccessibilityEvent(Object delegate, View host,
            AccessibilityEvent event) {
        ((AccessibilityDelegate) delegate).onPopulateAccessibilityEvent(host, event);
    }

    public static boolean onRequestSendAccessibilityEvent(Object delegate, ViewGroup host,
            View child, AccessibilityEvent event) {
        return ((AccessibilityDelegate) delegate).onRequestSendAccessibilityEvent(host, child,
                event);
    }

    public static void sendAccessibilityEvent(Object delegate, View host, int eventType) {
        ((AccessibilityDelegate) delegate).sendAccessibilityEvent(host, eventType);
    }

    public static void sendAccessibilityEventUnchecked(Object delegate, View host,
            AccessibilityEvent event) {
        ((AccessibilityDelegate) delegate).sendAccessibilityEventUnchecked(host, event);
    }
}