android - 如何更新 datepickerdialog android 中的日期？

Question

**你好， 我在 android 中开发应用程序，我在其中使用 DatePiker 对话框，我尝试过

@override

protected 对话框 onCreateDialog(int id) {

开关(id){

    case DATE_DIALOG_ID:
    {
        if(tvDate.getText().toString().equalsIgnoreCase("--"))
        {
            Calendar c = Calendar.getInstance();
            mYear = c.get(Calendar.YEAR);
            mMonth = c.get(Calendar.MONTH);
            mDay = c.get(Calendar.DAY_OF_MONTH);
        }
        else
        {
            String _date[] = tvDate.getText().toString().split("-");
            String _monthName = _date[0];
            mMonth = helper.getMonthFromName(_monthName) -1;
            mDay = Integer.parseInt(_date[1]);
        }
            return new DatePickerDialog(this,mDateSetListener,mYear, mMonth, mDay);
    }

        return null;
}

@override

私有(private) DatePickerDialog.OnDateSetListener mDateSetListener = 新的 DatePickerDialog.OnDateSetListener() {

public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        mYear = year;
        mMonth = monthOfYear;
        mDay = dayOfMonth;
        updateDate();
        if(tvRepeat.getText().toString().equalsIgnoreCase("Weekly")) {

                        tvDayName.setText(" (" + getDayNameForWeeklyRepeat() + ")");
        }
    }
};

private void updateDate() {

    tvDate.setText(new StringBuilder()
            // Month is 0 based so add 1
        .append(DateUtils.getMonthString(mMonth,DateUtils.LENGTH_SHORT))
                    .append("-")
        .append(pad(mDay)).append("-")
        .append(pad(mYear%100)));
         }

所以 onCreateDialog 方法只调用一次，但是当我单击下一条记录时，DatePiker 对话框显示第一次显示的记录的胆量，但我想显示新记录的日期帮帮我

Answer 1

引自 http://developer.android.com/guide/tutorials/views/hello-datepicker.html

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

        // capture our View elements
        mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
        mPickDate = (Button) findViewById(R.id.pickDate);

        // add a click listener to the button
        mPickDate.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                showDialog(DATE_DIALOG_ID);
            }
        });

        // get the current date
        final Calendar c = Calendar.getInstance();
        mYear = c.get(Calendar.YEAR);
        mMonth = c.get(Calendar.MONTH);
        mDay = c.get(Calendar.DAY_OF_MONTH);

        // display the current date
        updateDisplay();
    }

覆盖 onCreateDialog

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DATE_DIALOG_ID:
        return new DatePickerDialog(this,
                    mDateSetListener,
                    mYear, mMonth, mDay);
    }
    return null;
}

如何更新显示:

// updates the date we display in the TextView
    private void updateDisplay() {
        mDateDisplay.setText(
            new StringBuilder()
                    // Month is 0 based so add 1
                    .append(mMonth + 1).append("-")
                    .append(mDay).append("-")
                    .append(mYear).append(" "));
    }