expo: Ejected Android app crashes onBarCodeScanned

I’m also seeing this using expo-camera@11.2.2 and expo-barcode-scanner@10.2.2. This issue should be reopened as it’s not resolved.

java.lang.RuntimeException: An error occurred while executing doInBackground()
	at android.os.AsyncTask$3.done(AsyncTask.java:354)
	at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
	at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
	at java.util.concurrent.FutureTask.run(FutureTask.java:271)
	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:764)
Caused by: java.lang.RuntimeException: getParameters failed (empty parameters)
	at android.hardware.Camera.native_getParameters(Native Method)
	at android.hardware.Camera.getParameters(Camera.java:2277)
	at expo.modules.barcodescanner.BarCodeScannerViewFinder$BarCodeScannerAsyncTask.doInBackground(BarCodeScannerViewFinder.java:199)
	at expo.modules.barcodescanner.BarCodeScannerViewFinder$BarCodeScannerAsyncTask.doInBackground(BarCodeScannerViewFinder.java:180)
	at android.os.AsyncTask$2.call(AsyncTask.java:333)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	... 4 more

same here, app crashs

<CameraScanner onBarCodeScanned={(result) => { if (!scanned) return; handleBarCodeScanned(result); }} ratio={‘1:1’} >

i have this exact same issue with expo-camera crashing when i assign a callback to onBarCodeScanning

You closed it last time too, and the issue still existed. Maybe more people can confirm that it’s fixed first?

Hey, based on #8847 I figured that this happens when the expo-barcode-scanner is not installed. As a workaround, I managed to prevent the crashes by installing expo-barcode-scanner with expo install expo-barcode-scanner.

I’ve ran into this multiple times today. The only way to resolve it is to completely clear all native parts, and even then I can’t tell why it starts showing again (which it will):

1. bare project (typescript)
2. add expo-camera (per instructions, ie. also add correct maven url)
3. test: <Camera style={{ flex: 1 }} />: it will work
4. add onBarCodeScanned={console.log}

Now, it might work, but most likely it will start crashing (instantly, when the first frame shows up). Exact same crash log.

If it doesn’t crash now, it seems that adding other dependencies will at some point “trigger” the crash and now it will keep on happening. There is definitely something wrong with the native code.

Here the scanner is null:

https://github.com/expo/expo/blob/8d441c7e9b081cfdd6a45edc165251d7273225a0/packages/expo-camera/android/src/main/java/expo/modules/camera/tasks/BarCodeScannerAsyncTask.java#L36

Which means that it must never be initialised, or not provided here:

https://github.com/expo/expo/blob/284d4840c02ae895f64a4fef994902027d51e614/packages/expo-camera/android/src/main/java/expo/modules/camera/ExpoCameraView.java#L255

It’s existence is not checked here (which might not be the actual issue. It’s much more likely that it’s dereferenced or that the provider doesn’t provide anything):

https://github.com/expo/expo/blob/284d4840c02ae895f64a4fef994902027d51e614/packages/expo-camera/android/src/main/java/expo/modules/camera/ExpoCameraView.java#L129

---

Reproducible example? Not quite – or at least not consistently, but it all points to the same issue. I can consistently make it break, once I can make it break, even when removing all the other code except for the Camera component.

• git clone: https://github.com/brentvatne/camera-example
• yarn
• yarn android

It might, or might not work out of the box. The first time I had it crash within seconds. The second time it took a while. The third project was instant again, but there I added a few native modules.

In the end I ended up with replacing his code with:

function ScannerScreen() {
  const [hasPermission, setHasPermission] = useState(null);
  const [scanned, setScanned] = useState(true);

  useEffect(() => {
    (async () => {
      const { status } = await Camera.requestPermissionsAsync();
      setHasPermission(status === "granted");
    })();
  }, []);

  const handleBarCodeScanned = ({ type, data }) => {
    setScanned(true);
    console.log({ type, data });
    alert(`Bar code with type ${type} and data ${data} has been scanned!`);
  };

  if (hasPermission === null) {
    return <Text>Requesting for camera permission</Text>;
  }
  if (hasPermission === false) {
    return <Text>No access to camera</Text>;
  }

  const width = Dimensions.get("window").width;
  const height = (width / 3) * 4;

  return (
    <View
      style={{
        flex: 1,
        flexDirection: "column",
        justifyContent: "flex-end"
      }}
    >
      <Camera
        style={{ width, height }}
        onBarCodeScanned={scanned ? undefined : handleBarCodeScanned}
      />

      {scanned && (
        <Button onPress={() => setScanned(false)} title="Tap to Scan Again"/>
      )}
    </View>
  );
}

Which then shows up correctly, and when I press the button it blows up (as it starts to scan).

same here.

Same for me

I havent got this issue anymore so closing it.

This was happening for me even with expo-barcode-scanner installed. I haven’t looked at this since. Perhaps it was a mismatch in versions.