1 /*
2  * Copyright (C) 2010 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 
17 package com.android.gallery3d.app;
18 
19 import android.app.Application;
20 import android.content.Context;
21 import android.os.AsyncTask;
22 
23 import com.android.gallery3d.data.DataManager;
24 import com.android.gallery3d.data.DownloadCache;
25 import com.android.gallery3d.data.ImageCacheService;
26 import com.android.gallery3d.gadget.WidgetUtils;
27 import com.android.gallery3d.picasasource.PicasaSource;
28 import com.android.gallery3d.util.GalleryUtils;
29 import com.android.gallery3d.util.LightCycleHelper;
30 import com.android.gallery3d.util.ThreadPool;
31 import com.android.gallery3d.util.UsageStatistics;
32 
33 import java.io.File;
34 
35 public class GalleryAppImpl extends Application implements GalleryApp {
36 
37     private static final String DOWNLOAD_FOLDER = "download";
38     private static final long DOWNLOAD_CAPACITY = 64 * 1024 * 1024; // 64M
39 
40     private ImageCacheService mImageCacheService;
41     private Object mLock = new Object();
42     private DataManager mDataManager;
43     private ThreadPool mThreadPool;
44     private DownloadCache mDownloadCache;
45 
46     @Override
onCreate()47     public void onCreate() {
48         super.onCreate();
49         initializeAsyncTask();
50         GalleryUtils.initialize(this);
51         WidgetUtils.initialize(this);
52         PicasaSource.initialize(this);
53         UsageStatistics.initialize(this);
54     }
55 
56     @Override
getAndroidContext()57     public Context getAndroidContext() {
58         return this;
59     }
60 
61     @Override
getDataManager()62     public synchronized DataManager getDataManager() {
63         if (mDataManager == null) {
64             mDataManager = new DataManager(this);
65             mDataManager.initializeSourceMap();
66         }
67         return mDataManager;
68     }
69 
70 
71     @Override
getImageCacheService()72     public ImageCacheService getImageCacheService() {
73         // This method may block on file I/O so a dedicated lock is needed here.
74         synchronized (mLock) {
75             if (mImageCacheService == null) {
76                 mImageCacheService = new ImageCacheService(getAndroidContext());
77             }
78             return mImageCacheService;
79         }
80     }
81 
82     @Override
getThreadPool()83     public synchronized ThreadPool getThreadPool() {
84         if (mThreadPool == null) {
85             mThreadPool = new ThreadPool();
86         }
87         return mThreadPool;
88     }
89 
90     @Override
getDownloadCache()91     public synchronized DownloadCache getDownloadCache() {
92         if (mDownloadCache == null) {
93             File cacheDir = new File(getExternalCacheDir(), DOWNLOAD_FOLDER);
94 
95             if (!cacheDir.isDirectory()) cacheDir.mkdirs();
96 
97             if (!cacheDir.isDirectory()) {
98                 throw new RuntimeException(
99                         "fail to create: " + cacheDir.getAbsolutePath());
100             }
101             mDownloadCache = new DownloadCache(this, cacheDir, DOWNLOAD_CAPACITY);
102         }
103         return mDownloadCache;
104     }
105 
initializeAsyncTask()106     private void initializeAsyncTask() {
107         // AsyncTask class needs to be loaded in UI thread.
108         // So we load it here to comply the rule.
109         try {
110             Class.forName(AsyncTask.class.getName());
111         } catch (ClassNotFoundException e) {
112         }
113     }
114 }
115