Dianne Hackborn | c68c913 | 2011-07-29 01:25:18 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.content; |
| 18 | |
| 19 | /** |
| 20 | * Extended {@link ComponentCallbacks} interface with a new callback for |
| 21 | * finer-grained memory management. |
| 22 | */ |
| 23 | public interface ComponentCallbacks2 extends ComponentCallbacks { |
| 24 | |
| 25 | /** |
| 26 | * Level for {@link #onTrimMemory(int)}: the process is nearing the end |
| 27 | * of the background LRU list, and if more memory isn't found soon it will |
| 28 | * be killed. |
| 29 | */ |
| 30 | static final int TRIM_MEMORY_COMPLETE = 80; |
| 31 | |
| 32 | /** |
| 33 | * Level for {@link #onTrimMemory(int)}: the process is around the middle |
| 34 | * of the background LRU list; freeing memory can help the system keep |
| 35 | * other processes running later in the list for better overall performance. |
| 36 | */ |
| 37 | static final int TRIM_MEMORY_MODERATE = 60; |
| 38 | |
| 39 | /** |
| 40 | * Level for {@link #onTrimMemory(int)}: the process has gone on to the |
| 41 | * LRU list. This is a good opportunity to clean up resources that can |
| 42 | * efficiently and quickly be re-built if the user returns to the app. |
| 43 | */ |
| 44 | static final int TRIM_MEMORY_BACKGROUND = 40; |
| 45 | |
| 46 | /** |
| 47 | * Level for {@link #onTrimMemory(int)}: the process had been showing |
| 48 | * a user interface, and is no longer doing so. Large allocations with |
| 49 | * the UI should be released at this point to allow memory to be better |
| 50 | * managed. |
| 51 | */ |
| 52 | static final int TRIM_MEMORY_UI_HIDDEN = 20; |
| 53 | |
| 54 | /** |
| 55 | * Called when the operating system has determined that it is a good |
| 56 | * time for a process to trim unneeded memory from its process. This will |
| 57 | * happen for example when it goes in the background and there is not enough |
| 58 | * memory to keep as many background processes running as desired. |
| 59 | * |
| 60 | * @param level The context of the trim, giving a hint of the amount of |
| 61 | * trimming the application may like to perform. May be |
| 62 | * {@link #TRIM_MEMORY_COMPLETE}, {@link #TRIM_MEMORY_MODERATE}, |
| 63 | * {@link #TRIM_MEMORY_BACKGROUND}, or {@link #TRIM_MEMORY_UI_HIDDEN}. |
| 64 | */ |
| 65 | void onTrimMemory(int level); |
| 66 | } |