Android开发之轻松打造DatePickterDialog可自由选择显示Day或者隐藏

package guanaj.com.easydatepickerdialog;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;

import java.lang.reflect.Field;
import java.util.Calendar;

/**
* Created by guanaj on 2017/3/7.
*/

class EasyDatePickerDialog extends AlertDialog implements DialogInterface.OnClickListener,
DatePicker.OnDateChangedListener {

private static final String YEAR = "year";
private static final String MONTH = "month";
private static final String DAY = "day";

private final DatePicker mDatePicker;
private final OnDateSetListener mDateSetListener;
private final Calendar mCalendar;
private boolean mHidDay =false;
private Context mContext;

public interface OnDateSetListener {
void onDateSet(DatePicker startDatePicker, int startYear, int startMonthOfYear, int startDayOfMonth);
}

private boolean mTitleNeedsUpdate = true;

public EasyDatePickerDialog(Context context,
OnDateSetListener callBack,
int year,
int monthOfYear,
int dayOfMonth,boolean hidDay) {
this(context, 0, callBack, year, monthOfYear, dayOfMonth,hidDay);
}

public EasyDatePickerDialog(Context context, int theme, OnDateSetListener listener, int year,
int monthOfYear, int dayOfMonth,boolean hidDay) {
super(context,  theme);

mDateSetListener = listener;
mCalendar = Calendar.getInstance();
mHidDay = hidDay;
mContext = getContext();
final LayoutInflater inflater = LayoutInflater.from(mContext);
final View view = inflater.inflate(R.layout.easydatepickterview, null);
setButton(BUTTON_POSITIVE, "确定", this);
setButton(BUTTON_NEGATIVE, "取消", this);
//setIcon(0); //移除按钮效果
setView(view);

mDatePicker = (DatePicker) view.findViewById(R.id.easydatePicker);
mDatePicker.init(year, monthOfYear, dayOfMonth, this);
if (hidDay) {
hideDayView(mDatePicker);
}

}

private void hideDayView(DatePicker mDatePicker) {
try {
/* android5.0以上 */
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
int daySpinnerId = Resources.getSystem().getIdentifier("day", "id", "android");
if (daySpinnerId != 0) {
View daySpinner = mDatePicker.findViewById(daySpinnerId);
if (daySpinner != null) {
daySpinner.setVisibility(View.GONE);
}
}
} else {
Field[] datePickerfFields = mDatePicker.getClass().getDeclaredFields();
for (Field datePickerField : datePickerfFields) {
if ("mDaySpinner".equals(datePickerField.getName()) || ("mDayPicker").equals(datePickerField.getName())) {
datePickerField.setAccessible(true);
Object dayPicker = new Object();
try {
dayPicker = datePickerField.get(mDatePicker);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
((View) dayPicker).setVisibility(View.GONE);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}

@Override
public void onDateChanged(DatePicker view, int year, int month, int day) {
if (view.getId()==R.id.easydatePicker) {
mDatePicker.init(year, month, day, this);
//可根据需要在此处更新title
}

}

@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case BUTTON_POSITIVE:
if (mDateSetListener != null) {
// Clearing focus forces the dialog to commit any pending
// changes, e.g. typed text in a NumberPicker.
mDatePicker.clearFocus();
mDateSetListener.onDateSet(mDatePicker, mDatePicker.getYear(),
mDatePicker.getMonth(), mDatePicker.getDayOfMonth());
}
break;
case BUTTON_NEGATIVE:
cancel();
break;
}
}

public DatePicker getDatePicker() {
return mDatePicker;
}

public void updateDate(int year, int monthOfYear, int dayOfMonth) {
mDatePicker.updateDate(year, monthOfYear, dayOfMonth);
}

@Override
public Bundle onSaveInstanceState() {
final Bundle state = super.onSaveInstanceState();
state.putInt(YEAR, mDatePicker.getYear());
state.putInt(MONTH, mDatePicker.getMonth());
state.putInt(DAY, mDatePicker.getDayOfMonth());
return state;
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
final int year = savedInstanceState.getInt(YEAR);
final int month = savedInstanceState.getInt(MONTH);
final int day = savedInstanceState.getInt(DAY);
mDatePicker.init(year, month, day, this);
}

public void setMaxDate(int year,int month,int day){
mCalendar.set(year,month-1,day);
mDatePicker.setMaxDate(mCalendar.getTimeInMillis());
}
public void setMinDate(int year,int month,int day){
mCalendar.set(year,month-1,day);
mDatePicker.setMinDate(mCalendar.getTimeInMillis());
}

}