60 lines
1.9 KiB
Java
60 lines
1.9 KiB
Java
/*
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* Copyright (C) 2018 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 com.android.settings.utils;
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import android.text.TextUtils;
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import android.util.ArrayMap;
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import androidx.preference.Preference;
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import androidx.preference.PreferenceGroup;
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/**
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* Class that helps track which {@link Preference}s in a {@link PreferenceGroup} are still being
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* used, and remove unused ones.
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*/
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public class PreferenceGroupChildrenCache {
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private ArrayMap<String, Preference> mPreferenceCache;
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public void cacheRemoveAllPrefs(PreferenceGroup group) {
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mPreferenceCache = new ArrayMap<>();
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final int N = group.getPreferenceCount();
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for (int i = 0; i < N; i++) {
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Preference p = group.getPreference(i);
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if (TextUtils.isEmpty(p.getKey())) {
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continue;
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}
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mPreferenceCache.put(p.getKey(), p);
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}
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}
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public void removeCachedPrefs(PreferenceGroup group) {
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for (Preference p : mPreferenceCache.values()) {
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group.removePreference(p);
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}
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mPreferenceCache = null;
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}
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public Preference getCachedPreference(String key) {
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return mPreferenceCache != null ? mPreferenceCache.remove(key) : null;
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}
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public int getCachedCount() {
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return mPreferenceCache != null ? mPreferenceCache.size() : 0;
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}
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}
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