---
title: How the SDK works - Android (classic)
description: Understand how the Android SDK loads, tracks, and send data
lastUpdated: 28 April 2026
source_url:
  html: https://docs.contentsquare.com/en/android/how-the-sdk-works/
  md: https://docs.contentsquare.com/en/android/how-the-sdk-works/index.md
---

> Documentation index: https://docs.contentsquare.com/llms.txt
> Use this file to discover all available pages before exploring further.

The latest CSQ SDK is here! Learn how to [upgrade your app](https://docs.contentsquare.com/en/csq-sdk-android/experience-analytics/upgrade-from-cs-sdk/).

The SDK auto-starts at application launch, attaches to the current process, and intercepts the events and gestures needed to capture analytics data.

## Configuration

Once started, our SDK fetches its configuration from our servers. Then depending on the segmentation size (defined by our team when you sign a contract) and the user consent status, it will start collecting analytics data from system and user events it detects from the runtime.

## Data collection

### Analytics data collection

The SDK monitors the application, lifecycle events, the view hierarchy, and generates data from the behavior of the app, the content of the screen and the user interactions. These events are then locally stored, and eventually sent to our servers in batches. We then aggregate that data to create usable visual information into our Web Application, which you use to gather insights.

### Session Replay data collection

See [Session Replay Initialization](https://docs.contentsquare.com/en/android/session-replay/#data-collection) to learn how Session Replay data collection works.

## Sending data

### Sending analytics data

Analytics data are sent in batches of maximum 50 events. Requests are triggered when network conditions allow for the server to be reached and:

* The current batch of events has reached 50
* Or the app is put in background

### Sending Session Replay Data

See [Session Replay Requests](https://docs.contentsquare.com/en/android/session-replay/#requests) to learn more about how Session Replay data is sent.

### Sending crash Data

See [Send Crash data](https://docs.contentsquare.com/en/android/error-analysis/#sending-crash-data) to learn more about how crash data is sent.

## Session definition

A session is one continuous period of user interaction. It starts upon app launch and persists through state changes, including putting the app in the background or terminating and restarting it. As long as users interact at least once every 30 minutes, it remains the same session.