Custom Date Picker Dialog in Android Lollipop

Question

I want a date picker to show only Month and Year. I\'ve customized the Date Picker to do so i.e., to remove \'day\' field from the picker,but in Android Lollipop Am getting

Answer 1

Using reflection to find and hide UI elements is not really a great practice. In your case, it stopped working in lollipop because the mDaySpinner is now contained in an internal private static DatePickerSpinngerDelegate class within the DatePicker class.

I would recommend going through the view hierarchy to find and hide the day spinner element instead. I wrote the following code that works in lollipop:

if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    int daySpinnerId = Resources.getSystem().getIdentifier("day", "id", "android");
    if (daySpinnerId != 0) {
        View daySpinner = datePicker.findViewById(daySpinnerId);
        if (daySpinner != null) {
            daySpinner.setVisibility(View.GONE);
        }
    }
}

Answer 2

Went ahead making a modified Date Picker called Simple Date picker ... have used the code similar to Date Picker just to show month and year

see https://github.com/resengupta/Month-Year-Date-Picker

SimpleDatePickerDialog.java class is responsible for showing the month and year number picker. SimpleDatePickerDelegate.java works to apply rules to the number pickers. SimpleDatePickerDialogFragment.java is a DialogFragment which wraps the alert dialog.

Answer 3

This is a basic example of a month picker, but can be easily adapted to pick also year and/or day (works also for older android versions):

public void initMonthPicker(){
dp_mes = (DatePicker) findViewById(R.id.dp_mes);

int year    = dp_mes.getYear();
int month   = dp_mes.getMonth();
int day     = dp_mes.getDayOfMonth();

dp_mes.init(year, month, day, new DatePicker.OnDateChangedListener() {
    @Override
    public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        month_i = monthOfYear + 1;
        Log.e("selected month:", Integer.toString(month_i));
     //Add whatever you need to handle Date changes
    }
});

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
    int daySpinnerId = Resources.getSystem().getIdentifier("day", "id", "android");
    if (daySpinnerId != 0)
    {
        View daySpinner = dp_mes.findViewById(daySpinnerId);
        if (daySpinner != null)
        {
            daySpinner.setVisibility(View.GONE);
        }
    }

    int monthSpinnerId = Resources.getSystem().getIdentifier("month", "id", "android");
    if (monthSpinnerId != 0)
    {
        View monthSpinner = dp_mes.findViewById(monthSpinnerId);
        if (monthSpinner != null)
        {
            monthSpinner.setVisibility(View.VISIBLE);
        }
    }

    int yearSpinnerId = Resources.getSystem().getIdentifier("year", "id", "android");
    if (yearSpinnerId != 0)
    {
        View yearSpinner = dp_mes.findViewById(yearSpinnerId);
        if (yearSpinner != null)
        {
            yearSpinner.setVisibility(View.GONE);
        }
    }
} else { //Older SDK versions
    Field f[] = dp_mes.getClass().getDeclaredFields();
    for (Field field : f)
    {
        if(field.getName().equals("mDayPicker") || field.getName().equals("mDaySpinner"))
        {
            field.setAccessible(true);
            Object dayPicker = null;
            try {
                dayPicker = field.get(dp_mes);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
            ((View) dayPicker).setVisibility(View.GONE);
        }

        if(field.getName().equals("mMonthPicker") || field.getName().equals("mMonthSpinner"))
        {
            field.setAccessible(true);
            Object monthPicker = null;
            try {
                monthPicker = field.get(dp_mes);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
            ((View) monthPicker).setVisibility(View.VISIBLE);
        }

        if(field.getName().equals("mYearPicker") || field.getName().equals("mYearSpinner"))
        {
            field.setAccessible(true);
            Object yearPicker = null;
            try {
                yearPicker = field.get(dp_mes);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
            ((View) yearPicker).setVisibility(View.GONE);
        }
    }
}

}