Setting up an Xbox 360 emulator on Android is relatively straightforward. Here's a step-by-step guide:
If you want to play Xbox 360 games on your Android device, Microsoft already offers a legal, high-performance solution: Xbox 360 Emulator Bios For Android
A quick Google or YouTube search will yield thousands of results for "Xbox 360 Emulator APK + BIOS download for Android." These are almost universally scams. Here is what you need to know: Setting up an Xbox 360 emulator on Android