| /* |
| * 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; |
| |
| /** |
| * Extended {@link ComponentCallbacks} interface with a new callback for |
| * finer-grained memory management. |
| */ |
| public interface ComponentCallbacks2 extends ComponentCallbacks { |
| |
| /** |
| * Level for {@link #onTrimMemory(int)}: the process is nearing the end |
| * of the background LRU list, and if more memory isn't found soon it will |
| * be killed. |
| */ |
| static final int TRIM_MEMORY_COMPLETE = 80; |
| |
| /** |
| * Level for {@link #onTrimMemory(int)}: the process is around the middle |
| * of the background LRU list; freeing memory can help the system keep |
| * other processes running later in the list for better overall performance. |
| */ |
| static final int TRIM_MEMORY_MODERATE = 60; |
| |
| /** |
| * Level for {@link #onTrimMemory(int)}: the process has gone on to the |
| * LRU list. This is a good opportunity to clean up resources that can |
| * efficiently and quickly be re-built if the user returns to the app. |
| */ |
| static final int TRIM_MEMORY_BACKGROUND = 40; |
| |
| /** |
| * Level for {@link #onTrimMemory(int)}: the process had been showing |
| * a user interface, and is no longer doing so. Large allocations with |
| * the UI should be released at this point to allow memory to be better |
| * managed. |
| */ |
| static final int TRIM_MEMORY_UI_HIDDEN = 20; |
| |
| /** |
| * Level for {@link #onTrimMemory(int)}: the process is not an expendable |
| * background process, but the device is running extremely low on memory |
| * and is about to not be able to keep any background processes running. |
| * Your running process should free up as many non-critical resources as it |
| * can to allow that memory to be used elsewhere. The next thing that |
| * will happen after this is {@link #onLowMemory()} called to report that |
| * nothing at all can be kept in the background, a situation that can start |
| * to notably impact the user. |
| */ |
| static final int TRIM_MEMORY_RUNNING_CRITICAL = 15; |
| |
| /** |
| * Level for {@link #onTrimMemory(int)}: the process is not an expendable |
| * background process, but the device is running low on memory. |
| * Your running process should free up unneeded resources to allow that |
| * memory to be used elsewhere. |
| */ |
| static final int TRIM_MEMORY_RUNNING_LOW = 10; |
| |
| |
| /** |
| * Level for {@link #onTrimMemory(int)}: the process is not an expendable |
| * background process, but the device is running moderately low on memory. |
| * Your running process may want to release some unneeded resources for |
| * use elsewhere. |
| */ |
| static final int TRIM_MEMORY_RUNNING_MODERATE = 5; |
| |
| /** |
| * Called when the operating system has determined that it is a good |
| * time for a process to trim unneeded memory from its process. This will |
| * happen for example when it goes in the background and there is not enough |
| * memory to keep as many background processes running as desired. You |
| * should never compare to exact values of the level, since new intermediate |
| * values may be added -- you will typically want to compare if the value |
| * is greater or equal to a level you are interested in. |
| * |
| * <p>To retrieve the processes current trim level at any point, you can |
| * use {@link android.app.ActivityManager#getMyMemoryState |
| * ActivityManager.getMyMemoryState(RunningAppProcessInfo)}. |
| * |
| * @param level The context of the trim, giving a hint of the amount of |
| * trimming the application may like to perform. May be |
| * {@link #TRIM_MEMORY_COMPLETE}, {@link #TRIM_MEMORY_MODERATE}, |
| * {@link #TRIM_MEMORY_BACKGROUND}, {@link #TRIM_MEMORY_UI_HIDDEN}, |
| * {@link #TRIM_MEMORY_RUNNING_CRITICAL}, {@link #TRIM_MEMORY_RUNNING_LOW}, |
| * or {@link #TRIM_MEMORY_RUNNING_MODERATE}. |
| */ |
| void onTrimMemory(int level); |
| } |