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 <LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:layout_weight="1"android:gravity="center"><ImageViewandroid:id="@+id/record_left"android:layout_width="40dp"android:layout_height="40dp"android:background="@drawable/record_left_press" /></LinearLayout><RelativeLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:layout_weight="2"android:gravity="center"><TextViewandroid:id="@+id/record_title"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:layout_gravity="center"android:maxLines="1"android:text="2016年8月21日"android:textColor="@color/colorWhite"android:textSize="16sp" /></RelativeLayout><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:layout_weight="1"android:gravity="center"><ImageViewandroid:id="@+id/record_right"android:layout_width="40dp"android:layout_height="40dp"android:background="@drawable/record_right_press" /></LinearLayout></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:orientation="vertical"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginLeft="20dp"android:layout_marginRight="20dp"android:layout_marginTop="10dp"android:orientation="horizontal"><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="日"android:textColor="@color/colorWhite"android:textSize="16sp" /></LinearLayout><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="一"android:textColor="@color/colorWhite"android:textSize="16sp" /></LinearLayout><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="二"android:textColor="@color/colorWhite"android:textSize="16sp" /></LinearLayout><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="三"android:textColor="@color/colorWhite"android:textSize="16sp" /></LinearLayout><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="四"android:textColor="@color/colorWhite"android:textSize="16sp" /></LinearLayout><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="五"android:textColor="@color/colorWhite"android:textSize="16sp" /></LinearLayout><LinearLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="六"android:textColor="@color/colorWhite"android:textSize="16sp" /></LinearLayout></LinearLayout><GridViewandroid:id="@+id/record_gridView"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_margin="20dp"android:numColumns="7" /></LinearLayout>
GridView的item文件 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center"android:orientation="horizontal"><TextViewandroid:id="@+id/date_item"android:layout_width="wrap_content"android:layout_height="wrap_content"android:textColor="@color/colorWhite"android:textSize="16sp" /> </LinearLayout>
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;}@Overridepublic int getCount() {return days.length;}@Overridepublic Object getItem(int i) {return days[i];}@Overridepublic long getItemId(int i) {return i;}@Overridepublic 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gridViewprivate DateAdapter dateAdapter;//定义adapterprivate 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];@Overrideprotected 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);}@Overridepublic 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

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