android - TimePickerDialog 运行两次

Question

Android Studio: with single textView and single TimePickerDialog as a nested local class.
When the TimePickerDialog is tapped and onTimeSet runs TWICE.

点击一次，它应该只运行一次。 (即“ toast ”不应该显示 PartyTime Set:0 然后紧接着 PartyTime Set:1 )
为什么要运行两次？...我怎样才能让它只运行一次？

public class MainActivity extends ActionBarActivity {
    int n_Count;
    SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");
    Calendar calPartyTime = Calendar.getInstance();
    int ct_hourParty = calPartyTime.get(Calendar.HOUR_OF_DAY); 
    int ct_minuteParty = calPartyTime.get(Calendar.MINUTE);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TimePickerDialog timePickerParty = new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {

                calPartyTime.set(Calendar.HOUR_OF_DAY, selectedHour);
                calPartyTime.set(Calendar.MINUTE, selectedMinute);

                String date = dateFormat.format(calPartyTime.getTime());

                TextView tv_PartyTime = (TextView) findViewById((R.id.partyTimeTextView));
                tv_PartyTime.setText(date);

                Toast.makeText(getApplicationContext(), "Party Time Set!:" + n_Count , Toast.LENGTH_SHORT).show();
                n_Count++;
            }
        }, ct_hourParty, ct_minuteParty, true);

        timePickerParty.setTitle("Set Party UTC (HH:MM)");
        timePickerParty.show();
    }
}

Answer 1

您可以添加一些我用过的逻辑(使用 bool 变量并检查其值 -

public static class DatePickerFragment extends DialogFragment implements OnDateSetListener {

boolean mFirst = true;

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    // Use the current date as the default date in the picker
    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    // Create a new instance of DatePickerDialog and return it
    return new DatePickerDialog(getActivity(), this, year, month, day);
}

public void onDateSet(DatePicker view, int year, int month, int day) {
    if (mFirst) {
        mFirst = false;
        // Do something with the date chosen by the user

        currentYear = year;
        currentMonth = month;
        currentDay = day;

        DialogFragment newFragment2 = new TimePickerFragment();
        newFragment2.show(getFragmentManager(), "timePicker");
    }
}
}

希望这有帮助:)