android：DatePicker的Listener不起作用

Question

我的代码如下。我想要的是标题根据我选择的日期而变化。

public class MainActivity extends ActionBarActivity {


    private TimePicker timePicker;
    private DatePicker datePicker;
    private Calendar cal;
    private int year;
    private int month;
    private int day;
    private int hour;
    private int minute;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        cal = Calendar.getInstance();
        year = cal.get(Calendar.YEAR);
        month = cal.get(Calendar.MONTH) + 1;
        day = cal.get(Calendar.DAY_OF_MONTH);
        hour = cal.get(Calendar.HOUR_OF_DAY);
        minute = cal.get(Calendar.MINUTE);

        setTitle(year + "-" + month + "-" + day + "-" + hour + "-" + minute);

        datePicker = (DatePicker) findViewById(R.id.datePicker);
        timePicker = (TimePicker) findViewById(R.id.timePicker);

        datePicker.init(year, month, day, new OnDateChangedListener() {

            @Override
            public void onDateChanged(DatePicker view, int year, int monthOfYear,
                    int dayOfMonth) {
                // TODO Auto-generated method stub
                setTitle(year + "-" + monthOfYear + "-" + dayOfMonth);
            }
        });

    }

}

当我在模拟器中运行它并更改日期时，标题永远不会改变。

Answer 1

完全适用于我的日期选择器对话框示例：

//declaration of DatePickerDialog//
DatePickerDialog datePickerDialog;
//intailizing the datePicakerDialog//
datePickerDialog = new DatePickerDialog(this, dateSetListener, Calendar.getInstance().get(Calendar.YEAR),
                Calendar.getInstance().get(Calendar.MONTH), Calendar.getInstance().get(Calendar.DAY_OF_MONTH));

//DatePickerDialog listerner

DatePickerDialog.OnDateSetListener dateSetListener = new DatePickerDialog.OnDateSetListener() {

        @SuppressWarnings("deprecation")
        @Override
        public void onDateSet(DatePicker view, int years, int monthOfYear,
                int dayOfMonth) {
                datePickerDialog.updateDate(
                        Calendar.getInstance().get(Calendar.YEAR), Calendar
                                .getInstance().get(Calendar.MONTH), Calendar
                                .getInstance().get(Calendar.DAY_OF_MONTH));

            }
        }
    };

//Seting date on dismising thedate picker//

datePickerDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {

            @Override
            public void onDismiss(DialogInterface dialog) {
                if (!isDateSet) {
                    datePickerDialog.updateDate(Calendar.getInstance().get(Calendar.YEAR),
                            Calendar.getInstance().get(Calendar.MONTH),
                            Calendar.getInstance().get(Calendar.DAY_OF_MONTH));

                                    }
            }
        });

我希望此代码可以帮助您解决此问题

Answer 2

我添加两个日志，一个在外面，另一个在里面。

   Log.i("tag", "Outside");
    datePicker.init(year, month, day, new OnDateChangedListener() {

        @Override
        public void onDateChanged(DatePicker view, int year, int monthOfYear,
                int dayOfMonth) {
            // TODO Auto-generated method stub
            Log.i("tag", "Go inside onDateChanged");
            setTitle(year + "-" + monthOfYear + "-" + dayOfMonth);
        }
    });

然后我在模拟器中运行它，我得到如下结果。

无论我如何从模拟器更改日期，都没有日志信息说＆＃34;进入日期更改＆＃34;。