Implementation method of Android calendar control

This example shares the implementation code of Android calendar control for your reference. The specific contents are as follows

1. Renderings:

2. Pop up dialog: selectdatedialog:

public class SelectDateDialog {

 private static final String TAG = "SelectDateDialog";

 private Dialog dialog;
 private TextView dateText;
 private int selectYear,selectMonth;
 private AppCompatActivity mContext;
 private DateAdapter adapter;
 private List<String> selWeekList = new ArrayList<>();
 private List<DateBean> list = new ArrayList<>();

 public SelectDateDialog builder(AppCompatActivity mContext,int year,int month) {
 this.mContext = mContext;
 this.selectYear = year;
 this.selectMonth = month;
 // 获取Dialog布局
 View view = LayoutInflater.from(mContext).inflate(R.layout.dialog_date,null);

 // 定义Dialog布局和参数
 dialog = new Dialog(mContext,R.style.AlertDialogStyle);
 dialog.setCanceledOnTouchOutside(false);//点击外部是否取消
 dialog.setCancelable(false);
 dialog.setContentView(view);
 Window window = dialog.getWindow();
 WindowManager.LayoutParams params = window.getAttributes();
 params.width = (ScreenUtils.getScreenWidth(mContext));
// params.height = (int) (ScreenUtils.getScreenHeight(mContext) * 0.5);
 window.setAttributes(params);
 window.setGravity(Gravity.BOTTOM);

 RecyclerView recycler = view.findViewById(R.id.recycler_select_date);
 dateText = view.findViewById(R.id.date_text);
 dateText.setText(year + "年" + month + "月");
 //下个月
 view.findViewById(R.id.next_month).setOnClickListener(view13 -> {
 if (selectMonth > 11) {
 selectYear = selectYear + 1;
 selectMonth = 1;
 } else {
 selectMonth++;
 }
 showNewData(selectYear,selectMonth);
 });
 //上个月
 view.findViewById(R.id.last_month).setOnClickListener(view14 -> {
 if (selectMonth < 2) {
 selectYear = selectYear - 1;
 selectMonth = 12;
 } else {
 selectMonth--;
 }
 showNewData(selectYear,selectMonth);
 });

 list = DataUtils.getCalendar(year,month);
 adapter = new DateAdapter(mContext,list);
 GridLayoutManager manager = new GridLayoutManager(mContext,7);
 recycler.setLayoutManager(manager);
 recycler.setAdapter(adapter);
 //取消
 view.findViewById(R.id.middle_cancel).setOnClickListener(view1 -> {
 dialog.dismiss();
 });
 //确定
 view.findViewById(R.id.middle_determine).setOnClickListener(view1 -> {
 initSelect();
 });
 //设置选中当天
 adapter.setNowDay(year,month,DataUtils.getLastMonth(year,month));
 return this;
 }

 private void showNewData(int year,int month) {
 list = DataUtils.getCalendar(year,month);
 //更新月数据
 adapter.setList(list);
 adapter.setNowDay(year,month));
 dateText.setText(year + "年" + month + "月");
 }

 /**
 * 获取选中的日期
 */
 private void initSelect() {
 selWeekList.clear();
 for (int i = 0; i < list.size(); i++) {
 if (list.get(i).isFlag()) {
 //记录数量
 selWeekList.add(selectYear + "-" + selectMonth + "-" + list.get(i).getWeek());
 }
 }
 Log.e(TAG,"initSelect: "+ list.size());
 Log.e(TAG,"initSelect: "+ selWeekList.size());

 if (selWeekList.size() == 0) {
 Toast.makeText(mContext,"未选则日期",Toast.LENGTH_SHORT).show();
 return;
 }
 dialog.dismiss();
 listener.date(DataUtils.returnList(selWeekList));
 Log.e(TAG,"initSelect: " + DataUtils.returnList(selWeekList));
 }

 public void show() {
 if (dialog != null && (!dialog.isShowing())) {
 dialog.show();
 }
 }

 private OnDateListener listener;

 public SelectDateDialog setListener(OnDateListener listener) {
 this.listener = listener;
 return this;
 }

 public interface OnDateListener {

 void date(String selectDate);
 }

}

ScreenUtils：

public class ScreenUtils {

 public static int getScreenWidth(Context context) {
 DisplayMetrics localDisplayMetrics = new DisplayMetrics();
 ((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(localDisplayMetrics);
 return localDisplayMetrics.widthPixels;
 }
}

DateBean：

public class DateBean {

 private int week;
 private boolean sign;
 //0 上月 1本月 2下月
 private int month;
 private boolean isFlag;

 public boolean isFlag() {
 return isFlag;
 }

 public void setFlag(boolean flag) {
 isFlag = flag;
 }

 public int getWeek() {
 return week;
 }

 public void setWeek(int week) {
 this.week = week;
 }

 public boolean isSign() {
 return sign;
 }

 public void setSign(boolean sign) {
 this.sign = sign;
 }

 public int getMonth() {
 return month;
 }

 public void setMonth(int month) {
 this.month = month;
 }

 public DateBean(int week,boolean sign,int month) {
 this.week = week;
 this.sign = sign;
 this.month = month;
 }
}

Adapter: dateadapter

public class DateAdapter extends CommonRecyclerAdapter<DateBean> {

 private static final String TAG = "DateAdapter";
 private Integer NowDay;
 private int year;
 private int month;

 public DateAdapter(Context context,List<DateBean> list) {
 super(context,R.layout.item_date,list);
 }

 public void setNowDay(int year,int month,int NowDay) {
 this.NowDay = NowDay;
 this.year = year;
 this.month = month;
 notifyDataSetChanged();
 }

 @Override
 public void convert(RecyclerHolder holder,DateBean item,int position) {

 TextView number = holder.getView(R.id.item_number);
 number.setText(item.getWeek() + "");

 //当前年月等于切换年月时才选中当天
 if (position == NowDay) {
 String date = year + "-" + month;
 if (date.equals(DataUtils.timeInMillsTrasToDate(1))) {
 number.setBackgroundResource(R.drawable.date_unsel_shape);
 number.setTextColor(Color.WHITE);
 }else {
 number.setTextColor(Color.parseColor("#333333"));
 }
 } else {
 number.setBackgroundResource(0);
 number.setTextColor(Color.parseColor("#333333"));
 if (item.getMonth() == 0 || item.getMonth() == 2) {
 number.setTextColor(Color.parseColor("#CDCDCD"));
 } else {
 number.setTextColor(Color.parseColor("#333333"));
 }
 }
 //点击事件
 number.setOnClickListener(view -> {
 //本月可以点击
 int NowYear = Integer.parseInt(DataUtils.timeInMillsTrasToDate(2));
 int NowMonth = Integer.parseInt(DataUtils.timeInMillsTrasToDate(3));
 //只有在今天之后的日期才可以选中
 if (year == NowYear) {
 if (item.getMonth() == 1 && month == NowMonth && position > NowDay) {
  onClick(item,number);
 } else if (month > NowMonth) {
  onClick(item,number);
 }
 } else if (year > NowYear) {
 onClick(item,number);
 }
 });
 }

 private void onClick(DateBean item,TextView number) {
 if (item.isFlag()) {
 item.setFlag(false);
 number.setBackgroundResource(0);
 number.setTextColor(Color.parseColor("#333333"));
 } else {
 item.setFlag(true);
 number.setBackgroundResource(R.drawable.date_sel_shape);
 number.setTextColor(Color.WHITE);
 }
 }
}

Note: the commonrecycleradapter has been written before and will not be repeated here

Data source: datautils

public class DataUtils {

 private static final String TAG = "DataUtils";

 /**
 * 日历
 */
 public static List<DateBean> getCalendar(int currentYear,int currentMonth) {
 //实例化集合
 List<DateBean> list = new ArrayList<>();
 Calendar c = Calendar.getInstance();
 c.clear();
 /**
 * 处理上个月月末
 */
 if (currentMonth - 1 == 0) {
 c.set(Calendar.YEAR,currentYear - 1);
 c.set(Calendar.MONTH,11);
 } else {
 c.set(Calendar.YEAR,currentYear);
 c.set(Calendar.MONTH,(currentMonth - 2));
 }
 int last_sumDays = c.getActualMaximum(Calendar.DAY_OF_MONTH);
 c.set(Calendar.DATE,last_sumDays);
 //得到一号星期几
 int weekDay = c.get(Calendar.DAY_OF_WEEK);
 if (weekDay < 7) {
 for (int i = weekDay - 1; i >= 0; i--) {
 Integer date = new Integer(last_sumDays - i);
 list.add(new DateBean(date,true,0));
 }
 }
 /**
 * 处理当前月
 */
 c.clear();
 c.set(Calendar.YEAR,currentMonth - 1);
 int currentsumDays = c.getActualMaximum(Calendar.DAY_OF_MONTH);
 for (int i = 1; i <= currentsumDays; i++) {
 Integer date = new Integer(i);
 list.add(new DateBean(date,1));
 }
 /**
 * 处理下个月月初
 */
 c.clear();
 if (currentMonth == 12) {
 c.set(Calendar.YEAR,currentYear + 1);
 c.set(Calendar.MONTH,0);
 } else {
 c.set(Calendar.YEAR,currentMonth);
 }
 c.set(Calendar.DATE,1);
 int currentWeekDay = c.get(Calendar.DAY_OF_WEEK);
 if (currentWeekDay > 2 && currentWeekDay < 8) {
 for (int i = 1; i <= 8 - currentWeekDay; i++) {
 list.add(new DateBean(i,2));
 }
 }
 return list;
 }

 /**
 * 获取上个月大小
 */
 public static Integer getLastMonth(int currentYear,int currentMonth) {
 //实例化集合
 List<Integer> list = new ArrayList<>();
 Calendar c = Calendar.getInstance();
 c.clear();
 /**
 * 处理上个月月末
 */
 if (currentMonth - 1 == 0) {
 c.set(Calendar.YEAR,last_sumDays);
 //得到一号星期几
 int weekDay = c.get(Calendar.DAY_OF_WEEK);
 if (weekDay < 7) {
 for (int i = weekDay - 1; i >= 0; i--) {
 list.add(i);
 }
 }
 Log.e(TAG,"getLastMonth: " + Integer.parseInt(timeInMillsTrasToDate(0)));
 return list.size() + Integer.parseInt(timeInMillsTrasToDate(0)) - 1;
 }

 /**
 * list转string字符串
 */
 public static String returnList(List<String> list) {
 if (null == list && list.size() == 0) {
 return "";
 } else {
 //去除空格
 String str = String.valueOf(list).replaceAll(" ","");
 return str.substring(1,str.length() - 1);
 }
 }

 /**
 * 时间转换
 */
 @TargetApi(Build.VERSION_CODES.N)
 public static String timeInMillsTrasToDate(int formatType) {
 DateFormat formatter = null;
 switch (formatType) {
 case 0:
 formatter = new SimpleDateFormat("dd");
 break;
 case 1:
 formatter = new SimpleDateFormat("yyyy-MM");
 break;
 case 2:
 formatter = new SimpleDateFormat("yyyy");
 break;
 case 3:
 formatter = new SimpleDateFormat("MM");
 break;
 }
 Calendar calendar = Calendar.getInstance();
 return formatter.format(calendar.getTime());
 }
}

Using: dateactivity

public class DateActivity extends AppCompatActivity {

 private Button openDate;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_date);
 openDate = this.findViewById(R.id.open_date);
 openDate.setOnClickListener(view -> {
 showDateDialog();
 });
 }

 private void showDateDialog() {
 int year = Integer.parseInt(DataUtils.timeInMillsTrasToDate(2));
 int month = Integer.parseInt(DataUtils.timeInMillsTrasToDate(3));
 new SelectDateDialog().builder(this,year,month)
 .setListener(selectDate -> openDate.setText(selectDate)).show();

 }
}

Corresponding layout: activity_ date

<?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:orientation="vertical">

 <Button
 android:id="@+id/open_date"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="打开日历" />
</LinearLayout>

2. Resource file:

date_ sel_ shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="oval"
 android:useLevel="false">

 <solid android:color="@color/colorAccent" />

 <!--<stroke android:width="1dp" android:color="@color/white"/>-->
 <size
 android:width="30dp"
 android:height="30dp" />

</shape>

date_ unsel_ shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="oval"
 android:useLevel="false">

 <solid android:color="@color/colorPrimary" />

 <!--<stroke android:width="1dp" android:color="@color/white"/>-->
 <size
 android:width="30dp"
 android:height="30dp" />

</shape>

dialog_ shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">

 <corners android:radius="5dp" />

 <solid android:color="#ffffff" />
</shape>

item_ date.xml：

<?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="wrap_content"
 android:gravity="center"
 android:padding="5dp">

 <TextView
 android:id="@+id/item_number"
 android:layout_width="35dp"
 android:layout_height="35dp"
 android:gravity="center"
 android:text="10"
 android:textSize="15sp" />

</LinearLayout>

Color:

<color name="colorPrimary">#008577</color>
<color name="colorPrimaryDark">#00574B</color>
<color name="colorAccent">#D81B60</color>

Style:

<style name="AlertDialogStyle" parent="@android:style/Theme.Dialog">
 <item name="android:windowBackground">@android:color/transparent</item>
 <item name="android:windowContentOverlay">@null</item>
 <item name="android:windowIsFloating">true</item>
 <item name="android:windowFrame">@null</item>
 <item name="android:backgroundDimEnabled">true</item>
 <item name="android:windowNoTitle">true</item>
 <item name="android:windowIsTranslucent">true</item>
</style>

The above is the whole content of this article. I hope it will help you in your study, and I hope you will support us a lot.