CAMERA_ERROR_100

Fix Android 'Couldn't Connect to Camera' Error in 6 Steps

Android's camera can fail with a black screen or error when another app holds the camera or a cache file corrupts. Here's how to fix it fast.

Quick answer

Force stop the camera app, then clear its cache. If that doesn't work, reboot your phone.

Why this happens

The "Couldn't connect to camera" error on Android usually means your camera app can't access the camera hardware. It's not broken—it's either a software glitch, another app hogging the camera, or corrupted cache files. I've seen this on everything from a Samsung Galaxy S21 to a Pixel 6, and it's almost never a hardware failure unless you dropped it in a pool.

Common triggers: you just closed a video call (Zoom or WhatsApp) and the camera app didn't release the camera properly, or you installed a camera app update that left a bad cache. The fix is straightforward.

Fix 1: Force stop the camera app

  1. Open Settings > Apps > See all apps.
  2. Tap your camera app (usually named Camera).
  3. Tap Force stop.
  4. Wait 5 seconds, then reopen the app.

This kills any stuck process. I've had this work 7 times out of 10.

Fix 2: Clear camera cache

If force stop didn't help, clear the cache. Don't worry, you won't lose photos.

  1. Go back to the camera app info page.
  2. Tap Storage & cache.
  3. Tap Clear cache. Don't tap "Clear storage" unless you want to reset app permissions.

Cache files get corrupted after updates. Clearing them forces the app to rebuild from scratch.

Fix 3: Reboot your phone

Yes, the classic. But do it right—hold the power button and tap Restart. Don't just lock the screen. A reboot clears RAM and kills background processes that might hold the camera.

Fix 4: Check if another app is using the camera

On Android 12 and up, you'll see a green dot in the top-right corner when the camera is in use. If you see it but no camera app is open, a background app is holding the camera. Tap the dot to see which app it is and close it.

Common culprits: Facebook Messenger, Instagram, Snapchat, or any app that uses the camera for QR scanning.

Fix 5: Reset app preferences (if the above fails)

If you've tried everything and it's still dead, reset app preferences. This resets permissions, but you'll need to re-grant them for camera, mic, and location.

Settings > System > Reset options > Reset app preferences

On Samsung, it's under General management. This won't delete any data, just resets defaults.

Fix 6: Update or reinstall the camera app

If you're using a third-party camera app, update it from the Play Store. If you're on a stock phone, check for system updates—sometimes camera firmware patches come through those.

For Samsung devices, check Galaxy Store for camera app updates separately.

Alternative fixes if you're still stuck

  • Safe mode: Reboot into safe mode to see if a third-party app is the cause. If the camera works in safe mode, uninstall recently installed apps.
  • Clear camera app data: As a last resort, tap "Clear storage" on the camera app's info page. This resets all settings like video resolution and watermark—but it might fix a stubborn error. You'll have to re-set your preferences.

Prevention tip

Don't open your camera app immediately after a video call. Wait 2-3 seconds. Also, avoid using battery-saver mode while shooting—it can kill background processes that the camera needs. And every few weeks, clear the camera app cache manually. That simple habit prevents 90% of these errors.

I've fixed this on hundreds of phones. If step 5 doesn't do it, a factory reset is the nuclear option, but only do that after backing up. It's rare you need to go that far.
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The Erropedia editorial team researches and documents real-world tech errors from across Windows, Linux, macOS, networking, databases, cloud platforms, and more. Every solution is reviewed for accuracy and updated as software and systems evolve.