android - how can telephony manager conditionally listen to multiple PhoneStateListener's events? -

i'm having telephony manager listening call_state.

now want additionally listen data_connection_state , service_state using same telephony manager under different conditions (plz refer following code snippet)

how can it?

my current code seems not work properly

telephonymanager = (telephonymanager) getsystemservice(context.telephony_service); phonestatelistener = new phonestatelistener() {     public void oncallstatechanged(int state, string incomingnumber) {         switch (state) {         case telephonymanager.call_state_idle:         case telephonymanager.call_state_offhook:             //             break;         case telephonymanager.call_state_ringing:             break;         }         super.oncallstatechanged(state, incomingnumber);     }      public void onservicestatechanged(servicestate servicestate) {         switch (servicestate.getstate()) {         case servicestate.state_emergency_only:         case servicestate.state_out_of_service:             //             break;         default:             break;         }         super.onservicestatechanged(servicestate);     }      public void ondataconnectionstatechanged(int state) {         switch (state) {         case telephonymanager.data_disconnected:             //             break;         default:             break;         }         super.ondataconnectionstatechanged(state);     } };  btnrun.setonclicklistener(new onclicklistener() {     public void onclick(view v) {         if (some conditions) {             telephonymanager.listen(phonestatelistener,                     phonestatelistener.listen_call_state);         }         if (some conditions) {    // additionally listen more states             telephonymanager                     .listen(phonestatelistener,                             phonestatelistener.listen_data_connection_state);         }         if (some conditions) {    // additionally listen more states             telephonymanager.listen(phonestatelistener,                     phonestatelistener.listen_service_state);         }     } } 

is there suggestion please?

thank all!

you can or flags when registering via listen()

documentation

here