What is this error with turning LED to TORCH mode?

Question

I am trying to make my app turn on the led. Whenever I run this code, it crashes. The app closes and gives runtime exception: FATAL Exception, java.lang.nullpointerexception.

    Camera cam = Camera.open();     
    cam.getParameters().setFlashMode(Parameters.FLASH_MODE_TORCH);
    cam.setParameters(cam.getParameters());

Can you tell to which line is the NullPointerException pointing at? Since here you have only one new object, it seems your `cam` object is `null`. Did you add the permission `` — JScoobyCed, Dec 04 '12 at 02:58

score 0 · Answer 1 · edited May 23 '17 at 12:18

Well, first of all your code won't work even if it didn't crash, as you would need something like:

Parameters params = cam.getParameters().setFlashMode(Parameters.FLASH_MODE_TORCH);
cam.setParameters(params);

However, that won't fix your crash; instead it seems that turning on torch mode is not a simple task, according to posts like this:

Use camera flashlight in Android

Within the answers, this one seems to cover most of the options.

What is this error with turning LED to TORCH mode?

1 Answers1