| /* |
| * Copyright (C) 2017 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.tv.util; |
| |
| import android.content.Context; |
| import android.util.SparseArray; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import java.util.ArrayList; |
| |
| /** A cache for the views. */ |
| public class ViewCache { |
| private static final SparseArray<ArrayList<View>> mViews = new SparseArray(); |
| |
| private static ViewCache sViewCache; |
| |
| private ViewCache() {} |
| |
| /** Returns an instance of the view cache. */ |
| public static ViewCache getInstance() { |
| if (sViewCache == null) { |
| sViewCache = new ViewCache(); |
| } |
| return sViewCache; |
| } |
| |
| /** Returns if the view cache is empty. */ |
| public boolean isEmpty() { |
| return mViews.size() == 0; |
| } |
| |
| /** Stores a view into this view cache. */ |
| public void putView(int resId, View view) { |
| ArrayList<View> views = mViews.get(resId); |
| if (views == null) { |
| views = new ArrayList(); |
| mViews.put(resId, views); |
| } |
| views.add(view); |
| } |
| |
| /** Stores multi specific views into the view cache. */ |
| public void putView(Context context, int resId, ViewGroup fakeParent, int num) { |
| LayoutInflater inflater = |
| (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); |
| ArrayList<View> views = mViews.get(resId); |
| if (views == null) { |
| views = new ArrayList<>(); |
| mViews.put(resId, views); |
| } |
| for (int i = 0; i < num; i++) { |
| View view = inflater.inflate(resId, fakeParent, false); |
| views.add(view); |
| } |
| } |
| |
| /** Returns the view for specific resource id. */ |
| public View getView(int resId) { |
| ArrayList<View> views = mViews.get(resId); |
| if (views != null && !views.isEmpty()) { |
| View view = views.remove(views.size() - 1); |
| if (views.isEmpty()) { |
| mViews.remove(resId); |
| } |
| return view; |
| } else { |
| return null; |
| } |
| } |
| |
| /** Returns the view if exists, or create a new view for the specific resource id. */ |
| public View getOrCreateView(LayoutInflater inflater, int resId, ViewGroup container) { |
| View view = getView(resId); |
| if (view == null) { |
| view = inflater.inflate(resId, container, false); |
| } |
| return view; |
| } |
| |
| /** Clears the view cache. */ |
| public void clear() { |
| mViews.clear(); |
| } |
| } |