57 lines
1.9 KiB
Java
57 lines
1.9 KiB
Java
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.content.res;
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import android.compat.annotation.UnsupportedAppUsage;
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import android.content.pm.ActivityInfo.Config;
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/**
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* A Cache class which can be used to cache resource objects that are easy to clone but more
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* expensive to inflate.
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*
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* @hide For internal use only.
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*/
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public class ConfigurationBoundResourceCache<T> extends ThemedResourceCache<ConstantState<T>> {
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@UnsupportedAppUsage
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public ConfigurationBoundResourceCache() {
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}
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/**
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* If the resource is cached, creates and returns a new instance of it.
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*
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* @param key a key that uniquely identifies the drawable resource
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* @param resources a Resources object from which to create new instances.
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* @param theme the theme where the resource will be used
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* @return a new instance of the resource, or {@code null} if not in
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* the cache
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*/
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public T getInstance(long key, Resources resources, Resources.Theme theme) {
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final ConstantState<T> entry = get(key, theme);
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if (entry != null) {
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return entry.newInstance(resources, theme);
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}
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return null;
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}
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@Override
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public boolean shouldInvalidateEntry(ConstantState<T> entry, @Config int configChanges) {
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return Configuration.needNewResources(configChanges, entry.getChangingConfigurations());
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}
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}
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