android - Flashlight control in Marshmallow -

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i have problem regarding camera in recent marshmallow build, more flashlight. on pre-marshmallow version need turn flash on/off following:

private void turnflashon(final camera camera, int flashlightdurationms) {     if (!isflashon()) {         final list<string> supportedflashmodes = camera.getparameters().getsupportedflashmodes();         if (supportedflashmodes != null && supportedflashmodes.contains(camera.parameters.flash_mode_torch)) {             mparams.setflashmode(camera.parameters.flash_mode_torch);             camera.setparameters(mparams);         }     } }

and

private void turnflashoff(camera camera) {     if (camera != null) {         final list<string> supportedflashmodes = camera.getparameters().getsupportedflashmodes();         if (supportedflashmodes != null && supportedflashmodes.contains(camera.parameters.flash_mode_off)) {             mparams.setflashmode(camera.parameters.flash_mode_off);             camera.setparameters(mparams);         }     } }

unfortunately, marshmallow devices began crash in wild. somehow camera.getparameters() , camera.setparameters() began fail messages such as:

runtimeexception: getparameters failed (empty parameters)

runtimeexception: setparameters failed

i tried starting , stopping preview before getting parameters, no longer throws errors. preview not resumed when call camera.startpreview().

i fear releasing camera , reopening out of question takes seconds , produce bad experience.

any suggestions on how turn flashlight on/off in marshmallow reliably?

google has introduced torchmode in os 6 (android m).
if purpose turn on/off flash, below code can that:

private static void handleactionturnonflashlight(context context){     try{          cameramanager manager = (cameramanager) context.getsystemservice(context.camera_service);         string[] list = manager.getcameraidlist();         manager.settorchmode(list[0], true);     }     catch (cameraaccessexception cae){         log.e(tag, cae.getmessage());         cae.printstacktrace();     } }  private static void handleactionturnoffflashlight(context context){     try{         cameramanager manager = (cameramanager) context.getsystemservice(context.camera_service);         manager.settorchmode(manager.getcameraidlist()[0], false);     }     catch (cameraaccessexception cae){         log.e(tag, cae.getmessage());         cae.printstacktrace();     } }

all have is: cameraid's list out of camera id zero(0) primary camera want turn flash on/off. pass cameraid settochmode api boolean value turning on or off.

do note piece of code work os 6, need check device os , based upon need select api's call pre-marshmallow devices.

kindly mark solution if solves problem.


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