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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.content;

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

    private IntentCompat() {
        /* Hide constructor */
    }

    /**
     * Broadcast Action: Resources for a set of packages (which were
     * previously unavailable) are currently
     * available since the media on which they exist is available.
     * The extra data {@link #EXTRA_CHANGED_PACKAGE_LIST} contains a
     * list of packages whose availability changed.
     * The extra data {@link #EXTRA_CHANGED_UID_LIST} contains a
     * list of uids of packages whose availability changed.
     * Note that the
     * packages in this list do not receive this broadcast.
     * The specified set of packages are now available on the system.
     * Includes the following extras:
     * 

     *  {@link #EXTRA_CHANGED_PACKAGE_LIST} is the set of packages
     * whose resources(were previously unavailable) are currently available.
     * {@link #EXTRA_CHANGED_UID_LIST} is the set of uids of the
     * packages whose resources(were previously unavailable)
     * are  currently available.
     * 
     *
     * This is a protected intent that can only be sent
     * by the system.
     */
    public static final String ACTION_EXTERNAL_APPLICATIONS_AVAILABLE =
        "android.intent.action.EXTERNAL_APPLICATIONS_AVAILABLE";

    /**
     * Broadcast Action: Resources for a set of packages are currently
     * unavailable since the media on which they exist is unavailable.
     * The extra data {@link #EXTRA_CHANGED_PACKAGE_LIST} contains a
     * list of packages whose availability changed.
     * The extra data {@link #EXTRA_CHANGED_UID_LIST} contains a
     * list of uids of packages whose availability changed.
     * The specified set of packages can no longer be
     * launched and are practically unavailable on the system.
     * 
Inclues the following extras:
     * 

     *  {@link #EXTRA_CHANGED_PACKAGE_LIST} is the set of packages
     * whose resources are no longer available.
     * {@link #EXTRA_CHANGED_UID_LIST} is the set of packages
     * whose resources are no longer available.
     * 
     *
     * This is a protected intent that can only be sent
     * by the system.
     */
    public static final String ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE =
        "android.intent.action.EXTERNAL_APPLICATIONS_UNAVAILABLE";

    /**
     * This field is part of
     * {@link android.content.Intent#ACTION_EXTERNAL_APPLICATIONS_AVAILABLE},
     * {@link android.content.Intent#ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE}
     * and contains a string array of all of the components that have changed.
     */
    public static final String EXTRA_CHANGED_PACKAGE_LIST =
            "android.intent.extra.changed_package_list";

    /**
     * This field is part of
     * {@link android.content.Intent#ACTION_EXTERNAL_APPLICATIONS_AVAILABLE},
     * {@link android.content.Intent#ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE}
     * and contains an integer array of uids of all of the components
     * that have changed.
     */
    public static final String EXTRA_CHANGED_UID_LIST =
            "android.intent.extra.changed_uid_list";
}