android - 我想从 DatePicker 获取日期

Question

好吧，我正在做一个应用程序，它有一个活动和另一个名为 MyPicker 的类，它扩展了 DialogFragment 并实现了 DatePickerDialog.OnDateSetListener

问题是当用户单击一个按钮时，会出现一个 dataPicker，我想将该日期从 datePicker 带到一个 texfield，它是活动。

你建议我怎么做？

Answer 1

嗨，这个问题已经在stackoverflow上问了很多次了。你可以做这样的事情-

public class MainActivity extends Activity {
    TextView textDate;
    private int year;
    private int month;
    private int day;
    static final int DATE_DIALOG_ID = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textDate = (TextView) findViewById(R.id.text_date);

        final Calendar c = Calendar.getInstance();
        year = c.get(Calendar.YEAR);
        month = c.get(Calendar.MONTH);
        day = c.get(Calendar.DAY_OF_MONTH);
        textDate.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                showDialog(DATE_DIALOG_ID);
            }
        });
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DATE_DIALOG_ID:
            return new DatePickerDialog(this, mDateSetListener, year, month,
                    day);
        }
        return null;
    }

    // updates the date we display in the TextView
    private void updateDisplay() {
        /*
         * Hide virtual keyboard
         */
        textDate.setText(new StringBuilder()
                // Month is 0 based so add 1
                .append(year).append("-").append(month + 1).append("-")
                .append(day).append(""));
    }

    private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {

        public void onDateSet(DatePicker view, int myear, int monthOfYear,
                int dayOfMonth) {
            year = myear;
            month = monthOfYear;
            day = dayOfMonth;
            updateDisplay();
        }
    };
}

演示链接在这里-

Answer 2

public class MainActivity extends Activity implements OnClickListener {

    private Button mDateButton;

    private Calendar mCalen;
    private int day;
    private int month;
    private int year;

    private static final int DATE_PICKER_ID = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDateButton = (Button) findViewById(R.id.date_button);
        mCalen = Calendar.getInstance();
        day = mCalen.get(Calendar.DAY_OF_MONTH);
        month = mCalen.get(Calendar.MONTH);
        year = mCalen.get(Calendar.YEAR);
        mDateButton.setOnClickListener(this);
    }

    @Override
    @Deprecated
    protected Dialog onCreateDialog(int id) {

        switch (id) {
            case DATE_PICKER_ID:
                return new DatePickerDialog(this, datePickerListener,
                        year, month, day);
        }
        return null;
    }

    private DatePickerDialog.OnDateSetListener datePickerListener =
            new DatePickerDialog.OnDateSetListener() {

                // while dialog box is closed, below method is called.
                public void onDateSet(DatePicker view, int selectedYear,
                        int selectedMonth, int selectedDay) {
                    year = selectedYear;
                    month = selectedMonth;
                    day = selectedDay;

                    // Set the Date String in Button
                    mDateButton.setText(day + " / " + (month + 1) + " / " + year);
                }
            };

    @Override
    public void onClick(View v) {

        showDialog(DATE_PICKER_ID);

    }
}

Answer 3

如果您要更改日期选择器中的日期，那么您可以这样做

datePicker.setOnDateChangeListner(new OnDateChangedListener() {
 public void onDateChanged(DatePicker view, int year1,
int monthOfYear1, int dayOfMonth1) {
year = year1;
monthOfYear = monthOfYear1;
dayOfMonth = dayOfMonth1;
}
}
);