(Our APK is actually a ZIP compressed file, which contains a class Dex, the program code generated after compilation is completely there, which can be easily decompiled into smali code through apktool and other tools. With these decompiled smali codes, we can easily understand some technologies used by others' APKs or directly repair others' APKs. Because of the existence of these APK decompilation tools, we urgently hope to have a way to prevent others from decompiling our APK, so as to safeguard our business secrets and interests.)