android - Blink flashlight when an incoming call receives -


i trying app makes mobile led flashlight blink when incoming call received.

broadcastreceiver code:

public class incomingcallinterceptor extends broadcastreceiver {                                    // 1      private camera camera;     private boolean isflashon;     private boolean hasflash;     camera.parameters params;      @override     public void onreceive(context context, intent intent) {                                         // 2         string state = intent.getstringextra(telephonymanager.extra_state);                         // 3         string msg = "ringing" + state;          if (telephonymanager.extra_state_ringing.equals(state)) {                                   // 4             string incomingnumber = intent.getstringextra(telephonymanager.extra_incoming_number);  // 5            // msg += ". incoming number " + incomingnumber;              // todo place "do when phone rings" ;-)             string mystring = "0101010101";             long blinkdelay = 50;             getcamera();               (int = 0; < mystring.length(); i++) {                 if (mystring.charat(i) == '0') {                     // params.setflashmode(camera.parameters.flash_mode_on);                     turnonflash();                 } else {                     // params.setflashmode(camera.parameters.flash_mode_off);                     turnoffflash();                 }                 try {                     thread.sleep(blinkdelay);                 } catch (interruptedexception e) {                     e.printstacktrace();                 }             }         }          toast.maketext(context, msg, toast.length_long).show();      }     private void turnonflash() {         if (!isflashon) {             if (camera == null || params == null) {                 return;             }                params = camera.getparameters();             params.setflashmode(camera.parameters.flash_mode_torch);             camera.setparameters(params);             camera.startpreview();             isflashon = true;           }      }      private void getcamera() {         if (camera == null) {             try {                 camera = camera.open();                 params = camera.getparameters();             } catch (runtimeexception e) {                 log.e("camera error. failed open. error: ", e.getmessage());             }         }     }     private void turnoffflash() {         if (isflashon) {             if (camera == null || params == null) {                 return;             }               params = camera.getparameters();             params.setflashmode(camera.parameters.flash_mode_off);             camera.setparameters(params);             camera.stoppreview();             isflashon = false;          }     } }

this how trying that. working fine first call. when make second call light not blinking getting toast message properly. doing wrong here??

just simple, call:

    camera.release();

after

    camera.stoppreview();

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