Generally, a guitar connection to Android device looks like this.:
Let’s see how it’s done in detail.
Step 1 of 3.
Get a guitar adapter.
To connect a guitar, you need a special guitar adapter. The adapter turns guitar sound into a data that can be read by your Android device.
There are two types of adapters: analog and digital. Analog uses a headphone jack for connection, while digital uses a USB port. Currently Tonebridge supports only analog devices.

Tonebridge supported devices: AmpKit Link, AmpKit Link HD, iRig, iRig 2.
Step 2 of 3.
Сonnect adapter to Android device.
Use a connection guide that came with your adapter. Each adapter has its own connection scheme, but the general rule is to plug the device into a headphone jack or —.
If your adapter has a volume control, be sure it's not set to zero.
Step 3 of 3.
Connect guitar to adapter.
Use any guitar cable with 1/4" jack. For example, like this one:
Plug one end of the cable into your guitar, and the other end into the adapter.
That's it! Your guitar should be connected now, and you can start playing.