116     private Preference mButtonWifiCalling;  field in CallFeaturesSetting
321             if (mButtonWifiCalling != null) {  in onCallStateChanged()
322                 mButtonWifiCalling.setEnabled(isCallStateIdle);  in onCallStateChanged()
394         mButtonWifiCalling = findPreference(getResourcesForSubId().getString(  in onResume()
500                     mButtonWifiCalling.setTitle(resolutions.get(0).loadLabel(pm));  in updateVtWfc()
501                     mButtonWifiCalling.setSummary(null);  in updateVtWfc()
502                     mButtonWifiCalling.setIntent(intent);  in updateVtWfc()
503                     prefSet.addPreference(mButtonWifiCalling);  in updateVtWfc()
505                     prefSet.removePreference(mButtonWifiCalling);  in updateVtWfc()
508                 prefSet.removePreference(mButtonWifiCalling);  in updateVtWfc()
511             prefSet.removePreference(mButtonWifiCalling);  in updateVtWfc()
514             mButtonWifiCalling.setTitle(title);  in updateVtWfc()
535             mButtonWifiCalling.setSummary(getResourcesForSubId().getString(resId));  in updateVtWfc()
536             Intent intent = mButtonWifiCalling.getIntent();  in updateVtWfc()
540             prefSet.addPreference(mButtonWifiCalling);  in updateVtWfc()
547                 prefSet.removePreference(mButtonWifiCalling);  in updateVtWfc()
552             prefSet.removePreference(mButtonWifiCalling);  in updateVtWfc()