java - End incoming call when sensor receives certain value android -


i'm trying implement program ends call when magnetic field sensor has been changed value. have managed display toast show application detect when app open. want expand that:

  1. when checkbox ticked, runs in background service (i'm not sure i've called service stuff correctly)
  2. the sensor should listening when there incoming call.

basically, want on sensor changed class called when box checked , call ringing, , application should check when app not open.

public class mainactivity extends activity implements sensoreventlistener {  checkbox calls, texts, events; textview one, two, three; sensormanager sm; sensor sensor; float sensorx, sensory, sensorz, sensorx2, sensory2, sensorz2; float ex, why, zed, diff, mdiff; int count;   telephonymanager tm; audiomanager audio;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main_activity);     linktoxml();      sensorx = sensory = sensorz = sensorx2 = sensory2= sensorz2=0;     mdiff = -30;     diff = 30;     count = 0;       calls.setoncheckedchangelistener(new oncheckedchangelistener()     {          public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) {                 //turn on call magnets               if (calls.ischecked()){                  startservice(new intent());                    if(telephonymanager.extra_state.equals(telephonymanager.extra_state_ringing))                  {                      sm = (sensormanager) getsystemservice(context.sensor_service);                      sensor = sm.getdefaultsensor(sensor.type_magnetic_field);                     sm.registerlistener(mainactivity.this, sensor, sensormanager.sensor_delay_fastest);                     audio = (audiomanager)getsystemservice(context.audio_service);                      //start listener magnet                       //toast.maketext(getapplicationcontext(),"phone riging", toast.length_long).show();                   }                }else{                  stopservice(new intent());              }             }     });   }


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