Alan Viverette | e54d245 | 2015-05-06 10:41:43 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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.res; |
| 18 | |
| 19 | import android.graphics.drawable.Drawable; |
| 20 | |
| 21 | /** |
| 22 | * Class which can be used to cache Drawable resources against a theme. |
| 23 | */ |
| 24 | class DrawableCache extends ThemedResourceCache<Drawable.ConstantState> { |
| 25 | private final Resources mResources; |
| 26 | |
| 27 | /** |
| 28 | * Creates a cache for the given Resources instance. |
| 29 | * |
| 30 | * @param resources the resources to use when creating new instances |
| 31 | */ |
| 32 | public DrawableCache(Resources resources) { |
| 33 | mResources = resources; |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * If the resource is cached, creates and returns a new instance of it. |
| 38 | * |
| 39 | * @param key a key that uniquely identifies the drawable resource |
| 40 | * @param theme the theme where the resource will be used |
| 41 | * @return a new instance of the resource, or {@code null} if not in |
| 42 | * the cache |
| 43 | */ |
| 44 | public Drawable getInstance(long key, Resources.Theme theme) { |
| 45 | final Drawable.ConstantState entry = get(key, theme); |
| 46 | if (entry != null) { |
| 47 | return entry.newDrawable(mResources, theme); |
| 48 | } |
| 49 | |
| 50 | return null; |
| 51 | } |
| 52 | |
| 53 | @Override |
| 54 | public boolean shouldInvalidateEntry(Drawable.ConstantState entry, int configChanges) { |
Alan Viverette | 7ef1e77 | 2015-07-20 16:03:04 -0400 | [diff] [blame^] | 55 | return Configuration.needNewResources(configChanges, entry.getChangingConfigurations()); |
Alan Viverette | e54d245 | 2015-05-06 10:41:43 -0700 | [diff] [blame] | 56 | } |
| 57 | } |