content: /*
   * Copyright (C) 2006 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.content;
  
  import android.annotation.NonNull;
  import android.content.res.Configuration;
  
  /**
   * The set of callback APIs that are common to all application components
   * ({@link android.app.Activity}, {@link android.app.Service},
   * {@link ContentProvider}, and {@link android.app.Application}).
   *
   * <p class="note"><strong>Note:</strong> You should also implement the {@link
   * ComponentCallbacks2} interface, which provides the {@link
   * ComponentCallbacks2#onTrimMemory} callback to help your app manage its memory usage more
   * effectively.</p>
   */
  public interface ComponentCallbacks {
      /**
       * Called by the system when the device configuration changes while your
       * component is running.  Note that, unlike activities, other components
       * are never restarted when a configuration changes: they must always deal
       * with the results of the change, such as by re-retrieving resources.
       *
       * <p>At the time that this function has been called, your Resources
       * object will have been updated to return resource values matching the
       * new configuration.
       *
       * <p>For more information, read <a href="{@docRoot}guide/topics/resources/runtime-changes.html"
       * >Handling Runtime Changes</a>.
       *
       * @param newConfig The new device configuration.
       */
      void onConfigurationChanged(@NonNull Configuration newConfig);
  
      /**
       * This is called when the overall system is running low on memory, and
       * actively running processes should trim their memory usage.  While
       * the exact point at which this will be called is not defined, generally
       * it will happen when all background process have been killed.
       * That is, before reaching the point of killing processes hosting
       * service and foreground UI that we would like to avoid killing.
       *
       * <p>You should implement this method to release
       * any caches or other unnecessary resources you may be holding on to.
       * The system will perform a garbage collection for you after returning from this method.
       * <p>Preferably, you should implement {@link ComponentCallbacks2#onTrimMemory} from
       * {@link ComponentCallbacks2} to incrementally unload your resources based on various
       * levels of memory demands.  That API is available for API level 14 and higher, so you should
       * only use this {@link #onLowMemory} method as a fallback for older versions, which can be
       * treated the same as {@link ComponentCallbacks2#onTrimMemory} with the {@link
       * ComponentCallbacks2#TRIM_MEMORY_COMPLETE} level.</p>
       */
      void onLowMemory();
  }
  