我在从DialogFragment调用我的Activity函数时遇到问题.我的MainActivity中有一些公共函数,我需要调用这些函数才能在DialogFragment中完成一些计算.每次我尝试使用getActivity()调用函数时.出现问题“无法解决方法”.
这是我在MainActivity中调用DialogFragment的方式：
FragmentManager fm = getSupportFragmentManager();
DialogWeekly dialogWeekly = new DialogWeekly();
dialogWeekly.show(getFragmentManager(), "fragment_dialogWeekly");
这就是DialogFragment的样子.我在出现上述问题的地方添加了两个注释行：
public class DialogReminder extends DialogFragment implements AdapterView.OnItemSelectedListener {
//--- Static Variables -----------------------------------------------------------------------//
private static final String MY_PREFS = "my_preferences";
private static Activity activity;
private static TimePicker timePicker;
private static View dialogReminderView;
//--- Integer Variables ----------------------------------------------------------------------//
private Integer weekday;
//--- String Variables -----------------------------------------------------------------------//
private String weekdayString;
//--- Other Variables ------------------------------------------------------------------------//
private SharedPreferences sharedPreferences;
/**
* Empty constructor required for DialogFragment
*/
public DialogReminder() { }
/**
* Called when a fragment is first attached to its activity.
* onCreate(Bundle) will be called after this
* @param activity Activity that is attached to this fragment
*/
public void onAttach(Activity activity) {
super.onAttach(activity);
}
//--- Override Functions ---------------------------------------------------------------------//
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.dialog_weekly, container);
}
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sharedPreferences = getActivity().getSharedPreferences(MY_PREFS, Context.MODE_PRIVATE);
return createAlertDialog();
}
@Override
public void onItemSelected(AdapterView> parent, View view, int pos, long id) {
Integer selectedItem = parent.getSelectedItemPosition();
weekdayString = parent.getItemAtPosition(pos).toString();
// Here is the problem: savePreferences -> cannot resolve method
getActivity().savePreferences("spinnerSelectionWeekday", String.valueOf(selectedItem));
weekday = selectedItem + 2;
if (weekday == 8) {
weekday = 1;
}
}
@Override
public void onNothingSelected(AdapterView> parent) {
// Another interface callback
}
//--- General Activity Functions -------------------------------------------------------------//
/**
*
* @return
*/
private AlertDialog createAlertDialog() {
AlertDialog.Builder alert = new AlertDialog.Builder(getActivity());
alert.setTitle(getResources().getString(R.string.optionReminder));
alert.setView(dialogReminderView);
alert.setNegativeButton(getResources().getString(R.string.cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alert.setPositiveButton(getResources().getString(R.string.ok), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
setReminder();
dialog.cancel();
}
});
setElementsGUI();
return alert.create();
}
/**
*
*/
private void setElementsGUI() {
Spinner spinner = (Spinner) dialogReminderView.findViewById(R.id.reminderWeekdaySpinner);
ArrayAdapter adapter = ArrayAdapter.createFromResource(getActivity(),
R.array.reminderSpinnerArray, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setOnItemSelectedListener(this);
spinner.setAdapter(adapter);
spinner.setSelection(Integer.parseInt(sharedPreferences.getString("spinnerSelectionWeekday", "0")));
}
//--- Button Functions -----------------------------------------------------------------------//
/**
*
*/
private void setReminder() {
// Here is the problem: all functions with getActivity() -> cannot resolve method
getActivity().checkReminder();
getActivity().setWeekdayReminder(weekday);
getActivity(("hour", String.valueOf(timePicker.getCurrentHour()));
getActivity().savePreferences("minute", String.valueOf(timePicker.getCurrentMinute()));
getActivity().checkReminder();
String hour = String.valueOf(getActivity().getHour());
if (hour.length() < 2) {
hour = "0" + hour;
}
String minute = String.valueOf(getActivity().getMinute());
if (minute.length() < 2) {
minute = "0" + minute;
}
String time = hour + ":" + minute;
String message = getResources().getString(R.string.reminderToast, weekdayString, time);
Toast toast = Toast.makeText(getActivity().getApplicationContext(), message, Toast.LENGTH_LONG);
toast.show();
}
}
