| /* |
| * 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.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(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(); |
| } |