Turn it on while the app is open

Open ClapWhistle and turn the finder on before you lock your phone. Microphone permission lets the app listen; it does not start the finder by itself.

Check the listening status in the app and the ongoing notification. Android uses a foreground microphone service to keep this work visible. The notification gives you a way to stop the finder without reopening the app. If notifications are restricted, Android may show its active-app controls differently.

If you force-stop ClapWhistle in Android Settings, reopen it and turn the finder on again. After a restart, check the app rather than assuming the microphone has started automatically.

Why listening can stop in the background

  • Battery restrictions. Some phones put apps to sleep or limit background use.
  • A call or another microphone app. The microphone may be temporarily unavailable or its input may be silenced.
  • Microphone privacy controls. Turning microphone access off in Android prevents the finder from hearing your signal.
  • Quiet hours. The app may be paused during a period you scheduled.
  • A force-stop or restart. You may need to start listening again from the app.

When you see a microphone warning, return to the app and follow its next step. Avoid relying only on the notification’s presence: use Signal check to confirm the microphone is hearing you.

Try a locked-screen test

  1. With the app open, use Signal check and confirm that your clap or whistle is recognised.
  2. Try the alert and make sure it is noticeable.
  3. Turn the finder on, put the phone on a nearby table and lock the screen.
  4. Wait a little, then give your chosen signal.
  5. If it fails, reopen the app and check whether listening stopped or the microphone was interrupted.

When the open-screen test works but the locked-screen test fails, check the battery settings for your phone. Change one setting and repeat the same test.

If both tests fail, start with the microphone and signal checklist. A background setting won’t fix an incorrect clap count or an alert you cannot hear.

Keep control of battery use

Listening uses the microphone and some battery. How much depends on your phone and how long you leave it running. Turn the finder off when you do not need it, or use quiet hours for your routine.

Use app-specific battery settings if listening is being interrupted. There is no need to switch off every battery-saving feature on your phone. After a system update, check the finder again because Android or your phone maker may have changed a setting.