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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The quickest documented way to add feature flags to an Android app is Firebase Remote Config: ship a safe default in the app, fetch a remotely managed value, and use it to control the feature. You can then change the value in the Firebase Console without waiting for an app-store release. A remote flag controls exposure; it does not remove the feature code from an already published APK.
What an Android feature flag does
A feature flag is a parameter that app code checks before enabling or varying a behavior. The app includes a local default, then fetches and activates a server-side value. This separates deploying code from deciding which users see it, and provides a way to switch off a feature remotely. Firebase describes flags as server-side parameters that can toggle features on demand in its 2023 explanation of feature flags with Remote Config.
Set up a basic flag with Firebase Remote Config
- Create a Firebase project and register the Android app. Register the app using its Android package name and complete Firebase’s standard Android setup.
- Add the Remote Config SDK. Use the Firebase Android BoM to manage SDK versions. For rollout monitoring involving Crashlytics, Firebase’s rollout documentation lists Android SDK 21.6.0 or later, or Firebase BoM 32.6.0 or later. Check the current Firebase setup documentation before choosing versions; those are the minimums stated on the rollout page, not a recommendation to pin an older release.
- Create a parameter and an in-app default. For example, create a Boolean parameter such as
new_checkout_enabledand set its app-side default tofalse. The Remote Config Android quickstart demonstrates defining defaults and fetching values. Choose a default that keeps an unfinished or risky feature off when the app starts without a successful fetch. - Fetch and activate the configuration. Remote Config fetches and caches values; decide when to activate them so a change does not unexpectedly alter the UI during a critical interaction. Firebase explains fetch and activation behavior in its loading strategies guide.
- Guard the feature behavior. Check the parameter near the code it controls, and make the disabled path complete. Test both paths, including startup and fetch failure, rather than assuming the remote value will always be available.
- Run the app and change the parameter. Publish a value in the Firebase Console, then verify the app observes it at the chosen activation point. Firebase’s quickstart provides the documented proof-of-concept flow.
Roll out to a percentage of users safely
For a staged release, create a Remote Config rollout with a condition that targets the intended app and audience, then monitor the enabled group against the control group. Firebase’s rollout guide says the randomly assigned enabled percentage is normally limited to 50% when an equal-sized control group is used; 100% is the documented exception. A request to expose a feature to 10% therefore means configuring a 10% rollout under the applicable targeting condition, not simply changing a local constant.
Use Crashlytics to watch stability and Google Analytics to evaluate product outcomes such as engagement, revenue, or conversion. Firebase recommends these integrations for rollout monitoring in its rollout documentation and rollout monitoring guide. Decide in advance which metrics matter and what result would prompt a pause or rollback; increase exposure only when the evidence is acceptable.
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If a published value needs to reach clients promptly, Firebase recommends real-time Remote Config for rollout responsiveness. It does not eliminate the need for a safe local default: the app may start before a successful fetch. If metrics worsen, change the parameter to disable the behavior rather than waiting for another store release.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose a flag or an A/B test
| Need | Use | What it provides |
|---|---|---|
| Operational control, staged exposure, or a kill switch | Remote Config flag | A remotely managed value that app code uses to enable, disable, or vary behavior. |
| A measured comparison between variants against a business objective | Firebase A/B Testing | An experiment workflow for comparing variants; Google Analytics must be enabled for experiment data. |
Firebase’s A/B Testing documentation lists Android SDK 17.1.1 as its minimum for experiments and describes promoting a selected variant to all targeted users. An experiment is useful when you need comparative evidence, while a simple flag is the more direct tool for release control.
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Security and lifecycle practices
- Do not put secrets in Remote Config. Parameters are readable by the app. Firebase warns against storing confidential data in keys or values in its parameter documentation.
- Do not use a flag to bypass platform requirements. Remote Config is not a substitute for required user authorization or consent; Firebase’s parameter guidance cautions against using it to circumvent platform requirements or change behavior that should require authorization.
- Record ownership and intent. For each flag, keep an owner, purpose, creation date, default, targeting rule, success metric, and planned removal date. This gives the team a clear basis for changing or deleting it.
- Plan for older app versions. Keep parameter semantics and app behavior compatible with binaries that remain in use. Avoid reusing a parameter name for an incompatible meaning across versions.
- Remove stale flags. A flag left behind after rollout adds a branch that future changes must account for. Remove the remote parameter and associated code when the decision is permanent and supported app versions no longer need the alternate path.
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