I understand you're looking for for Android, but I must clarify: there is no official or safe, working APK of Sonic Adventure DX for Android. The game was never officially released on mobile by SEGA. Any APK claiming to be "Sonic Adventure DX" is likely a fake, a virus, or a broken emulator wrapper.
However, if you want a to play Sonic Adventure DX on Android, here is the legitimate story: Descargar Sonic Adventure Dx Para Android Apk Sin
If you'd like, I can guide you step by step on setting up a safe emulator to play the real Sonic Adventure DX on your Android device — legally and without viruses. I understand you're looking for for Android, but