Android 从DatePicker按钮获取值时遇到困难？

我有一个按钮显示DatePicker。当我点击按钮时，它将显示DatePickerDialog。在这里，我试图获取日期值，我想在文本视图中获取它。但是，当我试图获取价值时，我面临着困难。如何在TextView中打印日期值

这是我的密码

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text1=(EditText) findViewById(R.id.editText1);
text2=(EditText) findViewById(R.id.editText2);
text3=(EditText) findViewById(R.id.editText3);
text4=(EditText) findViewById(R.id.editText4);
date=(Button) findViewById(R.id.datepicker);
date.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        DatePickerDialog dpd = new DatePickerDialog(MainActivity.this, mDateSetListener, myear, mmonth, mday);
        dpd.show();
    }
});
   final Calendar c = Calendar.getInstance();
   myear = c.get(Calendar.YEAR);
   mmonth = c.get(Calendar.MONTH);
   mday = c.get(Calendar.DAY_OF_MONTH);
}
private void updateDisplay() {
    // TODO Auto-generated method stub
    textdate.setText(new StringBuilder()
    .append(mmonth+1).append("-").append(mday).append("-")
    .append(myear));
}
private DatePickerDialog.OnDateSetListener mDateSetListener = new 
        DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear,
                    int dayOfMonth) {
                myear=year;
                mmonth=monthOfYear;
                mday=dayOfMonth;
                updateDisplay();
            }
        };

---

在任何你想显示选择器的按钮上调用这个

    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getSupportFragmentManager(), "datePicker");

显示选择器后，您将有“确定”按钮

public static class DatePickerFragment extends DialogFragment implements
        DatePickerDialog.OnDateSetListener {

    @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);

        DatePickerDialog d = new DatePickerDialog(getActivity(), this,
                year, month, day);
        DatePicker dp = d.getDatePicker();
        dp.setMaxDate(c.getTimeInMillis());
        // Create a new instance of DatePickerDialog and return it
        return d;
    }

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

        tv1.setText(day + "-" + month + "-" + year);

    }
}

---

关于日期设置方法，请参考文本视图，此代码可能会帮助您解决问题

试试这个

private DatePickerDialog.OnDateSetListener pickerListener = new DatePickerDialog.OnDateSetListener() {
    // when dialog box is closed, below method will be called.
    @SuppressLint("SimpleDateFormat")
    @Override
    public void onDateSet(DatePicker view, int selectedYear,
            int selectedMonth, int selectedDay) {
        pYear  = selectedYear;
        pMonth = selectedMonth;
        pDay   = selectedDay;

        // Show selected date 
        SimpleDateFormat sdf = new SimpleDateFormat("dd MMM yyyy");
        // saving date to String variable
        String formatedDate = sdf.format(new java.util.Date(pYear-1900, pMonth, pDay)); 
        // setting date to TextView


        // **Note :** Make sure that you have defined value to your textview i.e. textview must not null...
        txt_date.setText(formatedDate);

    }
};

您尚未初始化textdate

创建一个全局变量textdate并像

textdate = (TextView) findViewById(R.id.text_view);

---

其中text\u view是文本视图的id，就像您在编辑文本和按钮时一样

您发现了什么问题？请注意，当我点击按钮时，它会显示DatePicker对话框。但是，如果我选择任何日期，如果我给出完成，那么应用程序将停止工作。它显示updateDisplay方法中的错误。