安卓简单日历的实现
最近无聊在做一个项目，需要用到日历。日历并不需要太复杂，只需要能够简单的查看就行，所以我选用了java提供的Calendar类，和安卓的gridView组合的形式.
先看效果图：
背景什么的先不要管他。只看主体部分，左箭头查看上个月的，右箭头查看下个月的.
接下来开始我们的日历。
首先，需要使用Calendar自己构造一个DateUtils类，这个相当简单。
import java.util.Calendar;
/**
* Created by 91905 on 2016/8/22 0022.
*/
public class DateUtils {
/**
* 获取当前年份
*
* @return
*/
public static int getYear() {
return Calendar.getInstance().get(Calendar.YEAR);
}
/**
* 获取当前月份
*
* @return
*/
public static int getMonth() {
return Calendar.getInstance().get(Calendar.MONTH) + 1;
}
/**
* 获取当前日期是该月的第几天
*
* @return
*/
public static int getCurrentDayOfMonth() {
return Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
}
/**
* 获取当前日期是该周的第几天
*
* @return
*/
public static int getCurrentDayOfWeek() {
return Calendar.getInstance().get(Calendar.DAY_OF_WEEK);
}
/**
* 获取当前是几点
*/
public static int getHour() {
return Calendar.getInstance().get(Calendar.HOUR_OF_DAY);//二十四小时制
}
/**
* 获取当前是几分
*
* @return
*/
public static int getMinute() {
return Calendar.getInstance().get(Calendar.MINUTE);
}
/**
* 获取当前秒
*
* @return
*/
public static int getSecond() {
return Calendar.getInstance().get(Calendar.SECOND);
}
/**
* 根据传入的年份和月份，获取当前月份的日历分布
*
* @param year
* @param month
* @return
*/
public static int[][] getDayOfMonthFormat(int year, int month) {
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, 1);//设置时间为每月的第一天
//设置日历格式数组,6行7列
int days[][] = new int[6][7];
//设置该月的第一天是周几
int daysOfFirstWeek = calendar.get(Calendar.DAY_OF_WEEK);
//设置本月有多少天
int daysOfMonth = getDaysOfMonth(year, month);
//设置上个月有多少天
int daysOfLastMonth = getLastDaysOfMonth(year, month);
int dayNum = 1;
int nextDayNum = 1;
//将日期格式填充数组
for (int i = 0; i < days.length; i++) {
for (int j = 0; j < days[i].length; j++) {
if (i == 0 && j < daysOfFirstWeek - 1) {
days[i][j] = daysOfLastMonth - daysOfFirstWeek + 2 + j;
} else if (dayNum <= daysOfMonth) {
days[i][j] = dayNum++;
} else {
days[i][j] = nextDayNum++;
}
}
}
return days;
}
/**
* 根据传入的年份和月份，判断上一个有多少天
*
* @param year
* @param month
* @return
*/
public static int getLastDaysOfMonth(int year, int month) {
int lastDaysOfMonth = 0;
if (month == 1) {
lastDaysOfMonth = getDaysOfMonth(year - 1, 12);
} else {
lastDaysOfMonth = getDaysOfMonth(year, month - 1);
}
return lastDaysOfMonth;
}
/**
* 根据传入的年份和月份，判断当前月有多少天
*
* @param year
* @param month
* @return
*/
public static int getDaysOfMonth(int year, int month) {
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 2:
if (isLeap(year)) {
return 29;
} else {
return 28;
}
case 4:
case 6:
case 9:
case 11:
return 30;
}
return -1;
}
/**
* 判断是否为闰年
*
* @param year
* @return
*/
public static boolean isLeap(int year) {
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
return true;
}
return false;
}
}
其中DateUtils类中的
public static int[][] getDayOfMonthFormat(int year, int month) { Calendar calendar = Calendar.getInstance(); calendar.set(year, month - 1, 1);//设置时间为每月的第一天 //设置日历格式数组,6行7列 int days[][] = new int[6][7]; //设置该月的第一天是周几 int daysOfFirstWeek = calendar.get(Calendar.DAY_OF_WEEK); //设置本月有多少天 int daysOfMonth = getDaysOfMonth(year, month); //设置上个月有多少天 int daysOfLastMonth = getLastDaysOfMonth(year, month); int dayNum = 1; int nextDayNum = 1; //将日期格式填充数组 for (int i = 0; i < days.length; i++) { for (int j = 0; j < days[i].length; j++) { if (i == 0 && j < daysOfFirstWeek - 1) { days[i][j] = daysOfLastMonth - daysOfFirstWeek + 2 + j; } else if (dayNum <= daysOfMonth) { days[i][j] = dayNum++; } else { days[i][j] = nextDayNum++; } } } return days; }
是将当前月份的日期分布保存到数组中返回.
接下来，布局文件
GridView的item文件
GridView的Adapter文件
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.jiaoml.smallmusic.MusicApp;
import com.jiaoml.smallmusic.R;
import com.jiaoml.smallmusic.music.Record;
import com.lidroid.xutils.db.sqlite.Selector;
import com.lidroid.xutils.db.sqlite.WhereBuilder;
import com.lidroid.xutils.exception.DbException;
/**
* Created by 91905 on 2016/8/24 0024.
*/
public class DateAdapter extends BaseAdapter {
private int[] days = new int[42];
private Context context;
private int year;
private int month;
public DateAdapter(Context context, int[][] days, int year, int month) {
this.context = context;
int dayNum = 0; //将二维数组转化为一维数组，方便使用
for (int i = 0; i < days.length; i++) {
for (int j = 0; j < days[i].length; j++) {
this.days[dayNum] = days[i][j];
dayNum++;
}
}
this.year = year;
this.month = month;
}
@Override
public int getCount() {
return days.length;
}
@Override
public Object getItem(int i) {
return days[i];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
ViewHolder viewHolder;
if (view == null) {
view = LayoutInflater.from(context).inflate(R.layout.date_item, null);
viewHolder = new ViewHolder();
viewHolder.date_item = (TextView) view.findViewById(R.id.date_item);
view.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) view.getTag();
}
if (i < 7 && days[i] > 20) {
viewHolder.date_item.setTextColor(Color.rgb(204, 204, 204));//将上个月的和下个月的设置为灰色
} else if (i > 20 && days[i] < 15) {
viewHolder.date_item.setTextColor(Color.rgb(204, 204, 204));
} viewHolder.date_item.setText(days[i] + "");
return view;
}
/**
* 优化Adapter
*/
class ViewHolder {
TextView date_item;
}接下来是Activity文件
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import com.jiaoml.smallmusic.R;
import com.jiaoml.smallmusic.adapter.DateAdapter;
/**
* Created by 91905 on 2016/8/24 0024.
*/
public class MainActivity extends Activity implements View.OnClickListener {
private GridView record_gridView;//定义gridView
private DateAdapter dateAdapter;//定义adapter
private ImageView record_left;//左箭头
private ImageView record_right;//右箭头
private TextView record_title;//标题
private int year;
private int month;
private String title;
private int[][] days = new int[6][7];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//初始化日期数据
initData();
//初始化组件
initView();
//组件点击监听事件
initEvent();
}
private void initData() {
year = DateUtils.getYear();
month = DateUtils.getMonth();
}
private void initEvent() {
record_left.setOnClickListener(this);
record_right.setOnClickListener(this);
}
private void initView() {
/**
* 以下是初始化GridView
*/
record_gridView = (GridView) findViewById(R.id.record_gridView);
days = DateUtils.getDayOfMonthFormat(2016, 8);
dateAdapter = new DateAdapter(this, days, year, month);//传入当前月的年
record_gridView.setAdapter(dateAdapter);
record_gridView.setVerticalSpacing(60);
record_gridView.setEnabled(false);
/**
* 以下是初始化其他组件
*/
record_left = (ImageView) findViewById(R.id.record_left);
record_right = (ImageView) findViewById(R.id.record_right);
record_title = (TextView) findViewById(R.id.record_title);
}
/**
* 下一个月
*
* @return
*/
private int[][] nextMonth() {
if (month == 12) {
month = 1;
year++;
} else {
month++;
}
days = DateUtils.getDayOfMonthFormat(year, month);
return days;
}
/**
* 上一个月
*
* @return
*/
private int[][] prevMonth() {
if (month == 1) {
month = 12;
year--;
} else {
month--;
}
days = DateUtils.getDayOfMonthFormat(year, month);
return days;
}
/**
* 设置标题
*/
private void setTile() {
title = year + "年" + month + "月";
record_title.setText(title);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.record_left:
days = prevMonth();
dateAdapter = new DateAdapter(this, days, year, month);
record_gridView.setAdapter(dateAdapter);
dateAdapter.notifyDataSetChanged();
setTile();
break;
case R.id.record_right:
days = nextMonth();
dateAdapter = new DateAdapter(this, days, year, month);
record_gridView.setAdapter(dateAdapter);
dateAdapter.notifyDataSetChanged();
setTile();
break;
}
}
}OK,一个简单的日历就完成了