added prev and next Day feature, also added click to today feature

Author: kgoel

app/src/main/java/com/shrikanthravi/collapsiblecalendarview/MainActivity.kt

@@ -40,11 +40,11 @@ class MainActivity : AppCompatActivity(){
         collapsibleCalendar = findViewById(R.id.collapsibleCalendarView)
         relativeLayout.setOnTouchListener(object:OnSwipeTouchListener(this@MainActivity){
             override fun onSwipeRight() {
-
+                collapsibleCalendar.nextDay()
             }
 
             override fun onSwipeLeft() {
-
+                collapsibleCalendar.prevDay()
             }
 
             override fun onSwipeTop() {
@@ -64,9 +64,14 @@ class MainActivity : AppCompatActivity(){
         val today = GregorianCalendar()
         collapsibleCalendar.addEventTag(today.get(Calendar.YEAR), today.get(Calendar.MONTH), today.get(Calendar.DAY_OF_MONTH))
         today.add(Calendar.DATE, 1)
+        collapsibleCalendar.selectedDay = Day(today.get(Calendar.YEAR), today.get(Calendar.MONTH), today.get(Calendar.DAY_OF_MONTH))
         collapsibleCalendar.addEventTag(today.get(Calendar.YEAR), today.get(Calendar.MONTH), today.get(Calendar.DAY_OF_MONTH), Color.BLUE)
-        collapsibleCalendar.params = CollapsibleCalendar.Params(-10, 90)
+        collapsibleCalendar.params = CollapsibleCalendar.Params(-100, 100)
         collapsibleCalendar.setCalendarListener(object : CollapsibleCalendar.CalendarListener {
+            override fun onDayChanged() {
+
+            }
+
             override fun onClickListener() {
                 if(collapsibleCalendar.expanded){
                     collapsibleCalendar.collapse(400)

collapsiblecalendarview2/src/main/java/com/shrikanthravi/collapsiblecalendarview/data/CalendarAdapter.java

@@ -0,0 +1,131 @@
+package com.shrikanthravi.collapsiblecalendarview.data
+
+import android.content.Context
+import android.graphics.PorterDuff
+import android.view.LayoutInflater
+import android.view.View
+import android.widget.ImageView
+import android.widget.TextView
+
+import com.shrikanthravi.collapsiblecalendarview.R
+
+import java.util.ArrayList
+import java.util.Calendar
+
+/**
+ * Created by shrikanthravi on 06/03/18.
+ */
+
+class CalendarAdapter(context: Context, cal: Calendar) {
+    private var mFirstDayOfWeek = 0
+    var calendar: Calendar
+    private val mInflater: LayoutInflater
+
+    private val mItemList = ArrayList<Day>()
+    private val mViewList = ArrayList<View>()
+    var mEventList = ArrayList<Event>()
+
+    // public methods
+    val count: Int
+        get() = mItemList.size
+
+    init {
+        this.calendar = cal.clone() as Calendar
+        this.calendar.set(Calendar.DAY_OF_MONTH, 1)
+
+        mInflater = LayoutInflater.from(context)
+
+        refresh()
+    }
+
+    fun getItem(position: Int): Day {
+        return mItemList[position]
+    }
+
+    fun getView(position: Int): View {
+        return mViewList[position]
+    }
+
+    fun setFirstDayOfWeek(firstDayOfWeek: Int) {
+        mFirstDayOfWeek = firstDayOfWeek
+    }
+
+    fun addEvent(event: Event) {
+        mEventList.add(event)
+    }
+
+    fun refresh() {
+        // clear data
+        mItemList.clear()
+        mViewList.clear()
+
+        // set calendar
+        val year = calendar.get(Calendar.YEAR)
+        val month = calendar.get(Calendar.MONTH)
+
+        calendar.set(year, month, 1)
+
+        val lastDayOfMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH)
+        val firstDayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1
+
+        // generate day list
+        val offset = 0 - (firstDayOfWeek - mFirstDayOfWeek) + 1
+        val length = Math.ceil(((lastDayOfMonth - offset + 1).toFloat() / 7).toDouble()).toInt() * 7
+        for (i in offset until length + offset) {
+            val numYear: Int
+            val numMonth: Int
+            val numDay: Int
+
+            val tempCal = Calendar.getInstance()
+            if (i <= 0) { // prev month
+                if (month == 0) {
+                    numYear = year - 1
+                    numMonth = 11
+                } else {
+                    numYear = year
+                    numMonth = month - 1
+                }
+                tempCal.set(numYear, numMonth, 1)
+                numDay = tempCal.getActualMaximum(Calendar.DAY_OF_MONTH) + i
+            } else if (i > lastDayOfMonth) { // next month
+                if (month == 11) {
+                    numYear = year + 1
+                    numMonth = 0
+                } else {
+                    numYear = year
+                    numMonth = month + 1
+                }
+                tempCal.set(numYear, numMonth, 1)
+                numDay = i - lastDayOfMonth
+            } else {
+                numYear = year
+                numMonth = month
+                numDay = i
+            }
+
+            val day = Day(numYear, numMonth, numDay)
+
+            val view = mInflater.inflate(R.layout.day_layout, null)
+            val txtDay = view.findViewById<View>(R.id.txt_day) as TextView
+            val imgEventTag = view.findViewById<View>(R.id.img_event_tag) as ImageView
+
+            txtDay.text = day.day.toString()
+            if (day.month != calendar.get(Calendar.MONTH)) {
+                txtDay.alpha = 0.3f
+            }
+
+            for (j in mEventList.indices) {
+                val event = mEventList[j]
+                if (day.year == event.year
+                        && day.month == event.month
+                        && day.day == event.day) {
+                    imgEventTag.visibility = View.VISIBLE
+                    imgEventTag.setColorFilter(event.color, PorterDuff.Mode.SRC_ATOP)
+                }
+            }
+
+            mItemList.add(day)
+            mViewList.add(view)
+        }
+    }
+}