1 /*
2  * Copyright (C) 2017 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 import java.lang.reflect.Method;
18 
19 public class Main {
getDexFileSize(String filename)20     private static long getDexFileSize(String filename) throws Exception {
21         ClassLoader loader = Main.class.getClassLoader();
22         Class<?> DexFile = loader.loadClass("dalvik.system.DexFile");
23         Method DexFile_loadDex = DexFile.getMethod("loadDex",
24                                                    String.class,
25                                                    String.class,
26                                                    Integer.TYPE);
27         Method DexFile_getStaticSizeOfDexFile = DexFile.getMethod("getStaticSizeOfDexFile");
28         Object dexFile = DexFile_loadDex.invoke(null, filename, null, 0);
29         return (Long) DexFile_getStaticSizeOfDexFile.invoke(dexFile);
30     }
31 
test(String resource)32     private static void test(String resource) throws Exception {
33         String filename = System.getenv("DEX_LOCATION") + "/res/" + resource;
34         long size = getDexFileSize(filename);
35         System.out.println("Size for " + resource + ": " + size);
36     }
37 
main(String[] args)38     public static void main(String[] args) throws Exception {
39         test("test1.dex");
40         test("test2.dex");
41         test("test-jar.jar");
42         test("multi-jar.jar");
43     }
44 }
45