Why is the camera flash not turning on and the CameraAccessException class is underlined red?

Question

I am trying to make a torchlight app but I am not able to turn it on properly. I have used the following logic to turn it on. Please let me know where I am going wrong. When I run this on my android phone it runs properly but the flashlight doesn't start.

if (count[0] == 0) {
    count[0] = 1;
    ((TransitionDrawable) imageView.getDrawable()).startTransition(3000);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        CameraManager camManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        String cameraId = null; // Usually back camera is at 0 position.
        try {
            cameraId = camManager.getCameraIdList()[0];
            camManager.setTorchMode(cameraId, true);   //Turn ON
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
} else {
    count[0] = 0;
    ((TransitionDrawable) imageView.getDrawable()).reverseTransition(3000);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        CameraManager camManager1 = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        String cameraId = null; // Usually back camera is at 0 position.
        try {
            cameraId = camManager1.getCameraIdList()[0];
            camManager1.setTorchMode(cameraId, false);   //Turn ON
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
}

Just to be sure, what is the version of Android are you running it on? — Kamran Ahmed, Jun 03 '17 at 08:45
Are you aware of what `if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {` does? — Kamran Ahmed, Jun 03 '17 at 09:08
ow I understand that it should be 16..but then some classess are failing — lmgguy, Jun 03 '17 at 09:10

score 1 · Accepted Answer · answered Jun 03 '17 at 09:12

The code you have written is fully functional on Android Marshmallow+.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

This line checks for what version of Android you are running the app on. It executes the code within the if block only on Android version 6+ (API level 23+).

You need to add the else part with an older way of turning the flashlight on like this method: How to turn on camera flash light programmatically in Android?

Why is the camera flash not turning on and the CameraAccessException class is underlined red?

1 Answers1