1 /*
2  * Copyright (C) 2008 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 android.content.res;
18 
19 import com.android.layoutlib.bridge.Bridge;
20 
21 import android.content.res.AssetManager;
22 
23 public class BridgeAssetManager extends AssetManager {
24 
25     /**
26      * This initializes the static field {@link AssetManager#sSystem} which is used
27      * by methods who get a global asset manager using {@link AssetManager#getSystem()}.
28      * <p/>
29      * They will end up using our bridge asset manager.
30      * <p/>
31      * {@link Bridge} calls this method after setting up a new bridge.
32      */
initSystem()33     public static AssetManager initSystem() {
34         if (!(AssetManager.sSystem instanceof BridgeAssetManager)) {
35             // Note that AssetManager() creates a system AssetManager and we override it
36             // with our BridgeAssetManager.
37             AssetManager.sSystem = new BridgeAssetManager();
38             AssetManager.sSystem.makeStringBlocks(null);
39         }
40         return AssetManager.sSystem;
41     }
42 
43     /**
44      * Clears the static {@link AssetManager#sSystem} to make sure we don't leave objects
45      * around that would prevent us from unloading the library.
46      */
clearSystem()47     public static void clearSystem() {
48         AssetManager.sSystem = null;
49     }
50 
BridgeAssetManager()51     private BridgeAssetManager() {
52     }
53 }
54