ThumbnailCache.java revision 9d0843df7e3984293dc4ab6ee2f9502e898b63aa 
1/*
2 * Copyright (C) 2013 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
17package com.android.documentsui;
18
19import android.app.ActivityManager;
20import android.content.Context;
21import android.graphics.Bitmap;
22import android.net.Uri;
23import android.util.LruCache;
24
25public class ThumbnailCache extends LruCache<Uri, Bitmap> {
26    private static ThumbnailCache sCache;
27
28    public static ThumbnailCache get(Context context) {
29        if (sCache == null) {
30            final ActivityManager am = (ActivityManager) context.getSystemService(
31                    Context.ACTIVITY_SERVICE);
32            final int memoryClassBytes = am.getMemoryClass() * 1024 * 1024;
33            sCache = new ThumbnailCache(memoryClassBytes / 4);
34        }
35        return sCache;
36    }
37
38    public ThumbnailCache(int maxSizeBytes) {
39        super(maxSizeBytes);
40    }
41
42    @Override
43    protected int sizeOf(Uri key, Bitmap value) {
44        return value.getByteCount();
45    }
46}
47