Managing the Power Resource

Learning how to request and release the power state is a basic power management skill:

1. To set the power state, call the request() method with the intended power resource and its state. In this example, the SCREEN_NORMAL state is requested for the screen resource:

   webapis.power.request("SCREEN", "SCREEN_NORMAL");

2. To release a power state, call the release() method with the intended resource:

   webapis.power.release("SCREEN");
   

3. To listen to the screen state changes, use the setScreenStateChangeListener() method:

   function onScreenStateChanged(previousState, changedState) 
   {
      console.log("Screen state changed from" + previousState + "to" + changedState);
   }
   webapis.power.setScreenStateChangeListener(onScreenStateChanged);