How Android Is Built

Understand the layers between the phone hardware, Android system services, apps and the user interface.

Core ideas

Use these points to build an accurate technical model before changing the device.

• The Linux kernel controls hardware access and process isolation.
• Android system services provide permissions, packages, notifications and connectivity.
• The manufacturer adds drivers, firmware, interfaces and update policy.

Decision rule

When troubleshooting, identify whether the problem belongs to hardware, Android, the manufacturer layer or one app before changing settings.

Apply it on your phone

Record the device facts, source and expected result. Make one reversible change, observe the outcome, and keep the evidence needed to undo it.