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author | Sunny Goyal <sunnygoyal@google.com> | 2019-05-22 14:13:53 -0700 |
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committer | Sunny Goyal <sunnygoyal@google.com> | 2019-05-22 14:23:12 -0700 |
commit | 5686333117ff6e2e4add6b2f32edcf047f241466 (patch) | |
tree | f7271799263a8d7d6cde5a6eb24bc9ad9ce25dd8 /src/com/android/launcher3/util/ViewCache.java | |
parent | 07b985b5e5763bafec786d52b8f65fdcff2d1b14 (diff) | |
download | android_packages_apps_Trebuchet-5686333117ff6e2e4add6b2f32edcf047f241466.tar.gz android_packages_apps_Trebuchet-5686333117ff6e2e4add6b2f32edcf047f241466.tar.bz2 android_packages_apps_Trebuchet-5686333117ff6e2e4add6b2f32edcf047f241466.zip |
Adding a utility class to cache views at an activity level
Bug: 122345781
Change-Id: I9a939e0b19c06c1089c1ceb515f8b97fb5dbb49e
Diffstat (limited to 'src/com/android/launcher3/util/ViewCache.java')
-rw-r--r-- | src/com/android/launcher3/util/ViewCache.java | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/com/android/launcher3/util/ViewCache.java b/src/com/android/launcher3/util/ViewCache.java new file mode 100644 index 000000000..08b874416 --- /dev/null +++ b/src/com/android/launcher3/util/ViewCache.java @@ -0,0 +1,73 @@ +/* + * Copyright (C) 2019 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 com.android.launcher3.util; + +import android.content.Context; +import android.util.SparseArray; +import android.view.LayoutInflater; +import android.view.View; +import android.view.ViewGroup; + +/** + * Utility class to cache views at an activity level + */ +public class ViewCache { + + protected final SparseArray<CacheEntry> mCache = new SparseArray(); + + public void setCacheSize(int layoutId, int size) { + mCache.put(layoutId, new CacheEntry(size)); + } + + public <T extends View> T getView(int layoutId, Context context, ViewGroup parent) { + CacheEntry entry = mCache.get(layoutId); + if (entry == null) { + entry = new CacheEntry(1); + mCache.put(layoutId, entry); + } + + if (entry.mCurrentSize > 0) { + entry.mCurrentSize --; + T result = (T) entry.mViews[entry.mCurrentSize]; + entry.mViews[entry.mCurrentSize] = null; + return result; + } + + return (T) LayoutInflater.from(context).inflate(layoutId, parent, false); + } + + public void recycleView(int layoutId, View view) { + CacheEntry entry = mCache.get(layoutId); + if (entry != null && entry.mCurrentSize < entry.mMaxSize) { + entry.mViews[entry.mCurrentSize] = view; + entry.mCurrentSize++; + } + } + + private static class CacheEntry { + + final int mMaxSize; + final View[] mViews; + + int mCurrentSize; + + public CacheEntry(int maxSize) { + mMaxSize = maxSize; + mViews = new View[maxSize]; + mCurrentSize = 0; + } + } +} |