android - Unable to open camera flash during call -


i trying build app camera flash happen in call , sms incoming activity. camera flash not opening during call...i have written simple program.

public class mainactivity extends activity {     .....     ....      public static class alerthandler extends broadcastreceiver {             @override             public void onreceive(context context, intent intent) {             system.out.println("===inside oneceive");             boolean incomingcall = false;             parameters alertparams;                 camera alertcamera;                 string callstate = intent.getstringextra(telephonymanager.extra_state);                 if (null != callstate && callstate.equals(telephonymanager.extra_state_ringing)) {                     incomingcall = true;                 }                 system.out.println("===incomingcall =="+incomingcall);                  if(incomingcall){                     system.out.println("opening camera...");                     alertcamera = camera.open();                     alertparams = alertcamera.getparameters();                     alertparams.setflashmode(parameters.flash_mode_torch);                     alertcamera.setparameters(alertparams);                     alertcamera.startpreview();                 }                                     }             }         }

i getting sysout opening camera well, flash. please code fix. no error in logcat.

in play store lot of app present, how work?

use working

public class mainactivity extends actionbaractivity {  private static camera camera; // flag detect flash on or off private static boolean islighon = false;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      camera = camera.open();  }  public static void toggle() {      if (islighon) {          log.i("info", "torch turn off!");         final parameters p = camera.getparameters();         p.setflashmode(parameters.flash_mode_off);         camera.setparameters(p);         camera.stoppreview();         islighon = false;      } else {          log.i("info", "torch turn on!");         final parameters p = camera.getparameters();         p.setflashmode(parameters.flash_mode_torch);          camera.setparameters(p);         camera.startpreview();         islighon = true;      }  }  }  public class alerthandler extends broadcastreceiver {  boolean incomingcall = false;  @override public void onreceive(context context, intent intent) {      string callstate = intent.getstringextra(telephonymanager.extra_state);      if (null != callstate             && callstate.equals(telephonymanager.extra_state_ringing)) {         incomingcall = true;      }      if (incomingcall) {         mainactivity.toggle();     } else {         mainactivity.toggle();     }  } }

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