Android decompilation and prevention of Decompilation

Decompilation:

1. Change the suffix of the apk file, for example, lianyunhelper3.0.11.apkto lianyunhelper3.0.11.zip.

2. decompress the lianyunhelper3.0.11.zip file with zipping
3. Extract the classes. dex file from the decompressed folder and put it in the directory where dex2jar. bat is located.
4. Run the cmd command to enter the directory where dex2jar. bat is located. Enter dex2jar. bat classes. dex to generate the classes. dex. dex2jar. jar file.
5. Use the jd-gui tool to open the classes. dex. dex2jar. jar file and you will see the source code.

6. Put the AndroidManifest. xml file in the directory of AXMLPrinter2.jar, run the cmd command, enter the directory of AXMLPrinter2.jar, and enter java-jar AXMLPrinter2.jar AndroidManifest. xml> AndroidManifest.txt.

Prevent decompilation:

After 2.3, add the following phrase "proguard. config = proguard. cfg" to the "default. properties" of the project"

Just copy the proguard. cfg file to the old project before 2.3.