次のエラーが表示されます。
14:03:44.170 322 hnlapp.hairdresser ERROR AndroidRuntime FATAL EXCEPTION: main
14:03:44.170 322 hnlapp.hairdresser ERROR AndroidRuntime java.lang.NullPointerException
14:03:44.170 322 hnlapp.hairdresser ERROR AndroidRuntime at hnlapp.hairdresser.Page_Calendar.onOptionsItemSelected(Page_Calendar.java:2824)
これを行おうとすると:
spinusertype.setAdapter(spinnerArrayAdapter);
このコードでは:
Spinner spinusertype = (Spinner) findViewById(R.id.spinnerUserType);
String[] userTypes = new String[]{"user","hairdresser","admin"};
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, userTypes);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinusertype.setAdapter(spinnerArrayAdapter);