Android の DatePickerDialog で「年月」のみ選択させる方法

こんな Fragment を作れば良いと思う。

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.View;
import android.view.Window;
import android.widget.DatePicker;

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class YearMonthPickerDialogFragment extends DialogFragment {

    private int year;
    private int month;
    private DatePickerDialog.OnDateSetListener onDateSetListener;

    public YearMonthPickerDialogFragment(int year, int month, DatePickerDialog.OnDateSetListener onDateSetListener) {
        this.year = year;
        this.month = month;
        this.onDateSetListener = onDateSetListener;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        YearMonthPickerDialog dialog = new YearMonthPickerDialog(getActivity(), onDateSetListener, year, month, 1);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        DatePicker datePicker = dialog.getDatePicker();
        int dayId = Resources.getSystem().getIdentifier("day", "id", "android");
        datePicker.findViewById(dayId).setVisibility(View.GONE);

        dialog.onDateChanged(datePicker, monthDescriptor.getYear(), monthDescriptor.getMonth(), 1);

        return dialog;
    }

    static class YearMonthPickerDialog extends DatePickerDialog {

        public YearMonthPickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {
            super(context, callBack, year, monthOfYear, dayOfMonth);
        }

        public YearMonthPickerDialog(Context context, int theme, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {
            super(context, theme, callBack, year, monthOfYear, dayOfMonth);
        }

        @Override
        public void onDateChanged(DatePicker view, int year, int month, int day) {
            Calendar cal = Calendar.getInstance();
            cal.set(year, month, day);
            String title = new SimpleDateFormat("yyyy-M").format(cal.getTime());
            setTitle(title);
        }
    }
}

参考

http://d.hatena.ne.jp/koko_u/20120225/1330187058

http://www.entrycoder.com/2013/05/how-to-show-only-month-and-year-fields.html