Android how to know if flashlight is on -

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i using cameramanager , cameracharacteristics

i know how check if flashlight turned on

try bit of code 

public boolean flashstatus() {       camera.parameters parameters = camera.getparameters();      if (parameters.getflashmode() == "flash_mode_torch") {         return true;     }      if (parameters.getflashmode() == "flash_mode_off") {         return false;     }  }

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