Android learning Experience (MAC)---Android anti-compilation (2)

1. Introduction

This analysis is a very simple program, is a primer on the introduction of anti-compilation tutorial
Mainly learn about the use of tools, the following is downloaded from the Internet test samples

Test Sample ex_05_01_.apk
Link: http://pan.baidu.com/s/1sjOIXJn Password: 5uq4

2. First, use Dex2jar and Jd-gui to view

Reference: Android Learning Tips (8)---Mac Dex2jar and Jd-gui use

先提取apk中的classes.dex，使用dex2jar工具

使用jd-gui打开classes_dex2jar.jar查看源代码

通过源代码查看，我们可以知道，这个程序是简单的字符串比较而且由于"gogo".equals("11")必定不能相等，所以每次都是提示错误

3. Now we're going to decompile

Reference: Android Learning Tips (2)---Mac anti-compilation under Android

首先，使用apktool工具

EX05_01\smali\irdc\ex05_01路径修改EX05_01$1.smali文件

The first method of modification:

在这里会进行判断，if-eqz，如果相等，则跳转到cond_0这里修改为if-nez

The second method of modification

修改字符串"11"为"gogo"，则每次判断都为正确

4. Recompile apk and sign

使用apktool工具重新编译

使用signapk.jar进行签名

5. Installation Test

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Android learning Experience (MAC)---Android anti-compilation (2)