Android calculates the date before and after the month of the week in which

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A time-dependent tool class was used

Package Com.yqy.yqy_date;import Android.util.log;import Java.text.dateformat;import java.text.ParseException; Import Java.text.simpledateformat;import java.util.date;/** * Time Tool class * @author YQY * */public class Tooldatetime {/** date format: YYYY-MM-DD HH:mm:ss **/public static final String df_yyyy_mm_dd_hh_mm_ss = "Yyyy-mm-dd HH:mm:ss";/** date format: Yyyy-mm-dd hh:m  M **/public static final String df_yyyy_mm_dd_hh_mm = "Yyyy-mm-dd hh:mm";/** date format: yyyy-mm-dd **/public static final string DF_YYYY_MM_DD = "Yyyy-mm-dd";/** date format: HH:mm:ss **/public static final String df_hh_mm_ss = "HH:mm:ss";/** date format: hh:mm **/p Ublic static final String df_hh_mm = "hh:mm";p rivate final static long minute = 60 * 1000;//1 min Private final static long hour = minute;//1 hours private final static long day = $ * hour;//1 days private final static long month = * day;//month pri Vate final static long year = month;//years/** log output identity **/private static final String TAG = ToolDateTime.class.getSimple Name ();/** * Format the date as a friendly string: a few minutes ago, a few hours ago, a fewDays ago, months ago, years ago, just * * @param date * @return */public static String formatfriendly (date date) {if (date = = null) {return null; }long diff = new Date (). GetTime ()-date.gettime (); Long r = 0;if (diff > year) {r = (diff/year); return r + "years Ago";} if (diff > month) {r = (diff/month); return r + "months ago";} if (diff > day) {r = (diff/day); return r + "days Ago";} if (diff > hour) {r = (diff/hour); return r + "hours Ago";} if (diff > minute) {r = (diff/minute); return r + "minutes Ago";} return "just";} /** * Format the date in YYYY-MM-DD HH:mm:ss * * @param datel * date * @return */public static String formatdatetime (Long da TeL) {SimpleDateFormat SDF = new SimpleDateFormat (DF_YYYY_MM_DD_HH_MM_SS);D ate Date = new Date (Datel); return Sdf.format ( date);} /** * Format the date in YYYY-MM-DD HH:mm:ss * * @param datel * date * @return */public static String formatdatetime (Long da TeL, String formater) {SimpleDateFormat SDF = new SimpleDateFormat (formater); return Sdf.format (New Date (Datel));} /** * Date in YYYY-MM-DD HH:mm:ss format* * @param datel * date * @return */public static string FormatDateTime (date date, String formater) {Simpledat Eformat SDF = new SimpleDateFormat (formater); return Sdf.format (date);}  /** * Convert date string to date * * @param strdate * string date * @return java.util.date date type */public static Date Parsedate (string strdate) {DateFormat DateFormat = new SimpleDateFormat (DF_YYYY_MM_DD_HH_MM_SS);D ate returndate = null;try {returnDate = d Ateformat.parse (strdate);} catch (ParseException e) {log.v (TAG, "Parsedate failed!");} return returndate;} /** * Get System Current Date * * @return */public static date gaincurrentdate () {return new date (); /** * Verify that the date is earlier than the current date * * @param target1 * Comparison time 1 * @param Target2 * Comparison time 2 * @return true means target1 than TA Rget2 late or equal to Target2, otherwise than Target2 early */public static Boolean comparedate (date target1, date Target2) {Boolean flag = false;try {St Ring Target1datetime = Tooldatetime.formatdatetime (TARGET1,DF_YYYY_MM_DD_HH_MM_SS); String Target2datetime = Tooldatetime.formatDateTime (TARGET2,DF_YYYY_MM_DD_HH_MM_SS); if (Target1datetime.compareto (target2datetime) <= 0) {flag = true;}} catch (Exception E1) {System.out.println ("Comparison failed, Reason:" + e1.getmessage ());} return flag;} /** * Increase Operation date * * @param target * Date required for operation * @param hour * hours * @return */public static date add DateTime (Date target, double hour) {if (null = = Target | | Hour < 0) {return target;} return new Date (Target.gettime () + (long) (HOUR * 60 * 60 * 1000)); /** * Subtract dates * * @param target * Date of operation required * @param hour * hours * @return */public Static Date Sub DateTime (Date target, double hour) {if (null = = Target | | Hour < 0) {return target;} return new Date (Target.gettime ()-(long) (HOUR * 60 * 60 * 1000));}}

Mainactivity

Package Com.yqy.yqy_date;import Java.text.simpledateformat;import Java.util.calendar;import java.util.Date;import Android.app.activity;import Android.os.bundle;import Android.view.menu;import Android.widget.TextView;public class Mainactivity extends Activity {private TextView tv_week, tv_month; @Overrideprotected void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); Tv_week = ( TextView) Findviewbyid (r.id.tv_week) Tv_month = (TextView) Findviewbyid (r.id.tv_month);D ate mdate = new Date ();D ate Sdate = Null;date eDate = null; String sstr = ""; String estr = ""; sdate = Tooldatetime.subdatetime (Mdate, (Mdate.getday ()-1) *); for (int i = 0; I < 15; i++) {eDate = Tooldatetime.adddatetime (sdate, 6 *); sstr = Tooldatetime.formatdatetime (sdate,tooldatetime.df_yyyy_mm _DD); estr = Tooldatetime.formatdatetime (EDATE,TOOLDATETIME.DF_YYYY_MM_DD); Tv_week.append (sstr + "~" + estr + "\ n"); Sdate = Tooldatetime.adddatetime (eDate, 24);} SimpleDateFormat format = new SimpleDateFormat (TOOLDATETIME.DF_YYYY_MM_DD);//Gets the first day of the current month: String ""; String last = "", for (int i = 0; I < 10; i++) {Calendar c = calendar.getinstance (); Calendar CA = calendar.getinstance (); C.add (Calendar.month, i); C.set (Calendar.day_of_month, 1);//set to number 1th, The current date is the first day of the month, firstly = Format.format (C.gettime ());//Gets the last day of the current month Ca.add (Calendar.month, i); Ca.set (Calendar.day_of_month, Ca.getactualmaximum (Calendar.day_of_month)); last = Format.format (Ca.gettime ()); Tv_month.append (first+ "~" +last+ "\ n ");}} @Overridepublic boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu; This adds items to the action bar if it is PR Esent.getmenuinflater (). Inflate (R.menu.main, menu); return true;}}

Xml

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" Match_parent "    android:paddingbottom= "@dimen/activity_vertical_margin"    android:paddingleft= "@dimen/activity_ Horizontal_margin "    android:paddingright=" @dimen/activity_horizontal_margin "    android:paddingtop=" @dimen /activity_vertical_margin "    tools:context=". Mainactivity ">    <textview        android:id=" @+id/tv_week "        android:layout_width=" Wrap_content "        android:layout_height= "wrap_content"/>    <textview        android:id= "@+id/tv_month"        Android : layout_width= "wrap_content"        android:layout_height= "wrap_content"        android:layout_alignparentleft= " True "        android:layout_below=" @+id/tv_week "        android:layout_margintop=" 28DP "/></relativelayout >

Android calculates the date before and after the month of the week in which