系统自带的日历虽然好用，但是不符合某些项目的需求，所以需要自定义布局，看网上许多自定义View完成自定义日历的，
自认水平不够，无法驾驭，所以采用gridview来实现。
CalendarUtils:(获取当前年月对应的数据数组)
package kyle.com.zujian;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
/**
* Created by kyle on 2016/8/12 0012.
* 获取某年某月的日期,界面上第一天为周日
* 通过传的年和月，获取对应年月的日期和第一天是周几
*/
public class CalendarUtils {
private static int FIRST_DAY_OF_WEEK;//第一天
private static Calendar calendar;//日历
public static List<DateEntity> getDate(int year, int month) {
if (year <= 0 || month < 1 || month > 12) {
return new ArrayList<>();//当年和月不符合规则时，返回空list
}
List<DateEntity> dates = new ArrayList<>();
calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, year);//设置年
calendar.set(Calendar.MONTH, month - 1);//设置月
calendar.set(Calendar.DAY_OF_MONTH, 1);//设置第一天
FIRST_DAY_OF_WEEK = calendar.get(Calendar.DAY_OF_WEEK) - 1;//获得第一天是周几 0:周日 6周六
for (int i = 0; i < FIRST_DAY_OF_WEEK; i++) {//假设是周日则跳过，假设不是周日,就添加对应数目的空白item
DateEntity entity = new DateEntity();
dates.add(entity);
}
int count = checkDays(year, month);//获取当前年月的天数
for (int i = 0; i < count; i++) {
DateEntity entity2 = new DateEntity(year, month, i + 1);
dates.add(entity2);
}
return dates;
}
/***
* 判断当前年月有多少天
*
* @param year
* @param month
* @return
*/
private static int checkDays(int year, int month) {
if (year < 1 || month > 12 || month < 1) {
return 0;
}
switch (month) {
case 2:
if (year % 4 == 0) {
return 29;
} else {
return 28;
}
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 4:
case 6:
case 9:
case 11:
return 30;
}
return 0;
}
}
实体类:DateEntity
package kyle.com.zujian;
/**
* Created by Administrator on 2016/8/9 0009.
*/
public class DateEntity {
private int year;
private int month;
private int day;
@Override
public String toString() {
return "DateEntity{" +
"year=" + year +
", month=" + month +
", day=" + day +
'}';
}
public DateEntity(){
}
public DateEntity( int year, int month, int day) {
this.year = year;
this.month = month;
this.day = day;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public int getMonth() {
return month;
}
public void setMonth(int month) {
this.month = month;
}
public int getDay() {
return day;
}
public void setDay(int day) {
this.day = day;
}
}
CalendarGridView:(自定义的gridview,把代码转移到这里面，方便调用.)
package kyle.com.zujian;
import android.content.Context;
import android.support.v4.content.ContextCompat;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
/**
* Created by kyle on 2016/8/15 0015.
* 自定义日历gridview
*/
public class CalendarGridView extends GridView {
private Context mContext;
private List<DateEntity> mList = new ArrayList<>();
private MyAdapter mAdapter;
private Calendar calendar;
/***
* 今天
*/
private int NOW_YEAR;//当前年
private int NOW_MONTH;//当前月
private int NOW_DAY;//当前日
public CalendarGridView(Context context) {
super(context, null);
mContext = context;
}
public CalendarGridView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
calendar = Calendar.getInstance();//获取日历实例
NOW_YEAR = calendar.get(Calendar.YEAR);//当前年
NOW_MONTH = calendar.get(Calendar.MONTH) + 1;//当前月
NOW_DAY = calendar.get(Calendar.DAY_OF_MONTH);//当前日
mAdapter = new MyAdapter();//实例化和设置适配器
setAdapter(mAdapter);
}
public void init(int year, int month) {
if (year < 1 || month < 1 || month > 12) {
Toast.makeText(mContext, "年份或月份错误!", Toast.LENGTH_SHORT).show();
return;
}
mList.clear();
for (DateEntity entity : CalendarUtils.getDate(year, month)) {
mList.add(entity);
}
mAdapter.notifyDataSetChanged();
}
private class MyAdapter extends BaseAdapter {
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
MyHolder holder;
if (convertView == null) {
convertView = View.inflate(mContext, R.layout.item_grid, null);
holder = new MyHolder();
holder.llMain = (LinearLayout) convertView.findViewById(R.id.ll_main);
holder.tvDate = (TextView) convertView.findViewById(R.id.tv_date);
holder.tvCount = (TextView) convertView.findViewById(R.id.tv_count);
convertView.setTag(holder);
} else {
holder = (MyHolder) convertView.getTag();
}
int year = mList.get(position).getYear();
int month = mList.get(position).getMonth();
int day = mList.get(position).getDay();
if (year == NOW_YEAR && month == NOW_MONTH && day == NOW_DAY) {
holder.llMain.setBackgroundResource(R.color.red);
holder.tvDate.setTextColor(ContextCompat.getColor(mContext, R.color.white));
holder.tvCount.setTextColor(ContextCompat.getColor(mContext, R.color.white));
} else {
holder.llMain.setBackgroundResource(R.color.white);
holder.tvDate.setTextColor(ContextCompat.getColor(mContext, R.color.black));
holder.tvCount.setTextColor(ContextCompat.getColor(mContext, R.color.black));
}
if (day != 0) {
holder.tvDate.setText(mList.get(position).getDay() + "");
} else {
holder.tvDate.setText("");
}
return convertView;
}
}
private class MyHolder {
private LinearLayout llMain;
private TextView tvDate;
private TextView tvCount;
}
}
在Activity里面这样调用:
CalendarGridView mGv= (CalendarGridView) findViewById(R.id.gv);
mGv.init(2016,8);
当然，布局和实体类都可以自己去根据需求写，而如果想要真正的日历功能，则可以使用viewpager+fragment实现了