Weekly Calendar

app/src/main/AndroidManifest.xml

@@ -9,6 +9,8 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.CalendarAppExample">
+        <activity android:name=".EventEditActivity"></activity>
+        <activity android:name=".WeekViewActivity" />
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/codewithcal/au/calendarappexample/CalendarAdapter.java

@@ -1,22 +1,24 @@
 package codewithcal.au.calendarappexample;
 
+import android.graphics.Color;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
 import androidx.annotation.NonNull;
 import androidx.recyclerview.widget.RecyclerView;
 
+import java.time.LocalDate;
 import java.util.ArrayList;
 
 class CalendarAdapter extends RecyclerView.Adapter<CalendarViewHolder>
 {
-    private final ArrayList<String> daysOfMonth;
+    private final ArrayList<LocalDate> days;
     private final OnItemListener onItemListener;
 
-    public CalendarAdapter(ArrayList<String> daysOfMonth, OnItemListener onItemListener)
+    public CalendarAdapter(ArrayList<LocalDate> days, OnItemListener onItemListener)
     {
-        this.daysOfMonth = daysOfMonth;
+        this.days = days;
         this.onItemListener = onItemListener;
     }
 
@@ -27,24 +29,36 @@ public CalendarViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int view
         LayoutInflater inflater = LayoutInflater.from(parent.getContext());
         View view = inflater.inflate(R.layout.calendar_cell, parent, false);
         ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
-        layoutParams.height = (int) (parent.getHeight() * 0.166666666);
-        return new CalendarViewHolder(view, onItemListener);
+        if(days.size() > 15) //month view
+            layoutParams.height = (int) (parent.getHeight() * 0.166666666);
+        else // week view
+            layoutParams.height = (int) parent.getHeight();
+
+        return new CalendarViewHolder(view, onItemListener, days);
     }
 
     @Override
     public void onBindViewHolder(@NonNull CalendarViewHolder holder, int position)
     {
-        holder.dayOfMonth.setText(daysOfMonth.get(position));
+        final LocalDate date = days.get(position);
+        if(date == null)
+            holder.dayOfMonth.setText("");
+        else
+        {
+            holder.dayOfMonth.setText(String.valueOf(date.getDayOfMonth()));
+            if(date.equals(CalendarUtils.selectedDate))
+                holder.parentView.setBackgroundColor(Color.LTGRAY);
+        }
     }
 
     @Override
     public int getItemCount()
     {
-        return daysOfMonth.size();
+        return days.size();
     }
 
     public interface  OnItemListener
     {
-        void onItemClick(int position, String dayText);
+        void onItemClick(int position, LocalDate date);
     }
 }

app/src/main/java/codewithcal/au/calendarappexample/CalendarUtils.java

@@ -0,0 +1,82 @@
+package codewithcal.au.calendarappexample;
+
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.YearMonth;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+
+public class CalendarUtils
+{
+    public static LocalDate selectedDate;
+
+    public static String formattedDate(LocalDate date)
+    {
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd MMMM yyyy");
+        return date.format(formatter);
+    }
+
+    public static String formattedTime(LocalTime time)
+    {
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("hh:mm:ss a");
+        return time.format(formatter);
+    }
+
+    public static String monthYearFromDate(LocalDate date)
+    {
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMMM yyyy");
+        return date.format(formatter);
+    }
+
+    public static ArrayList<LocalDate> daysInMonthArray(LocalDate date)
+    {
+        ArrayList<LocalDate> daysInMonthArray = new ArrayList<>();
+        YearMonth yearMonth = YearMonth.from(date);
+
+        int daysInMonth = yearMonth.lengthOfMonth();
+
+        LocalDate firstOfMonth = CalendarUtils.selectedDate.withDayOfMonth(1);
+        int dayOfWeek = firstOfMonth.getDayOfWeek().getValue();
+
+        for(int i = 1; i <= 42; i++)
+        {
+            if(i <= dayOfWeek || i > daysInMonth + dayOfWeek)
+                daysInMonthArray.add(null);
+            else
+                daysInMonthArray.add(LocalDate.of(selectedDate.getYear(),selectedDate.getMonth(),i - dayOfWeek));
+        }
+        return  daysInMonthArray;
+    }
+
+    public static ArrayList<LocalDate> daysInWeekArray(LocalDate selectedDate)
+    {
+        ArrayList<LocalDate> days = new ArrayList<>();
+        LocalDate current = sundayForDate(selectedDate);
+        LocalDate endDate = current.plusWeeks(1);
+
+        while (current.isBefore(endDate))
+        {
+            days.add(current);
+            current = current.plusDays(1);
+        }
+        return days;
+    }
+
+    private static LocalDate sundayForDate(LocalDate current)
+    {
+        LocalDate oneWeekAgo = current.minusWeeks(1);
+
+        while (current.isAfter(oneWeekAgo))
+        {
+            if(current.getDayOfWeek() == DayOfWeek.SUNDAY)
+                return current;
+
+            current = current.minusDays(1);
+        }
+
+        return null;
+    }
+
+
+}

app/src/main/java/codewithcal/au/calendarappexample/CalendarViewHolder.java

@@ -6,21 +6,28 @@
 import androidx.annotation.NonNull;
 import androidx.recyclerview.widget.RecyclerView;
 
+import java.time.LocalDate;
+import java.util.ArrayList;
+
 public class CalendarViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
 {
+    private final ArrayList<LocalDate> days;
+    public final View parentView;
     public final TextView dayOfMonth;
     private final CalendarAdapter.OnItemListener onItemListener;
-    public CalendarViewHolder(@NonNull View itemView, CalendarAdapter.OnItemListener onItemListener)
+    public CalendarViewHolder(@NonNull View itemView, CalendarAdapter.OnItemListener onItemListener, ArrayList<LocalDate> days)
     {
         super(itemView);
+        parentView = itemView.findViewById(R.id.parentView);
         dayOfMonth = itemView.findViewById(R.id.cellDayText);
         this.onItemListener = onItemListener;
         itemView.setOnClickListener(this);
+        this.days = days;
     }
 
     @Override
     public void onClick(View view)
     {
-        onItemListener.onItemClick(getAdapterPosition(), (String) dayOfMonth.getText());
+        onItemListener.onItemClick(getAdapterPosition(), days.get(getAdapterPosition()));
     }
 }

app/src/main/java/codewithcal/au/calendarappexample/Event.java

@@ -0,0 +1,65 @@
+package codewithcal.au.calendarappexample;
+
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.util.ArrayList;
+
+public class Event
+{
+    public static ArrayList<Event> eventsList = new ArrayList<>();
+
+    public static ArrayList<Event> eventsForDate(LocalDate date)
+    {
+        ArrayList<Event> events = new ArrayList<>();
+
+        for(Event event : eventsList)
+        {
+            if(event.getDate().equals(date))
+                events.add(event);
+        }
+
+        return events;
+    }
+
+
+    private String name;
+    private LocalDate date;
+    private LocalTime time;
+
+    public Event(String name, LocalDate date, LocalTime time)
+    {
+        this.name = name;
+        this.date = date;
+        this.time = time;
+    }
+
+    public String getName()
+    {
+        return name;
+    }
+
+    public void setName(String name)
+    {
+        this.name = name;
+    }
+
+    public LocalDate getDate()
+    {
+        return date;
+    }
+
+    public void setDate(LocalDate date)
+    {
+        this.date = date;
+    }
+
+    public LocalTime getTime()
+    {
+        return time;
+    }
+
+    public void setTime(LocalTime time)
+    {
+        this.time = time;
+    }
+}

app/src/main/java/codewithcal/au/calendarappexample/EventAdapter.java

@@ -0,0 +1,37 @@
+package codewithcal.au.calendarappexample;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.util.List;
+
+public class EventAdapter extends ArrayAdapter<Event>
+{
+    public EventAdapter(@NonNull Context context, List<Event> events)
+    {
+        super(context, 0, events);
+    }
+
+    @NonNull
+    @Override
+    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent)
+    {
+        Event event = getItem(position);
+
+        if (convertView == null)
+            convertView = LayoutInflater.from(getContext()).inflate(R.layout.event_cell, parent, false);
+
+        TextView eventCellTV = convertView.findViewById(R.id.eventCellTV);
+
+        String eventTitle = event.getName() +" "+ CalendarUtils.formattedTime(event.getTime());
+        eventCellTV.setText(eventTitle);
+        return convertView;
+    }
+}

app/src/main/java/codewithcal/au/calendarappexample/EventEditActivity.java

@@ -0,0 +1,44 @@
+package codewithcal.au.calendarappexample;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+import android.view.View;
+import android.widget.EditText;
+import android.widget.TextView;
+
+import java.time.LocalTime;
+
+public class EventEditActivity extends AppCompatActivity
+{
+    private EditText eventNameET;
+    private TextView eventDateTV, eventTimeTV;
+
+    private LocalTime time;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_event_edit);
+        initWidgets();
+        time = LocalTime.now();
+        eventDateTV.setText("Date: " + CalendarUtils.formattedDate(CalendarUtils.selectedDate));
+        eventTimeTV.setText("Time: " + CalendarUtils.formattedTime(time));
+    }
+
+    private void initWidgets()
+    {
+        eventNameET = findViewById(R.id.eventNameET);
+        eventDateTV = findViewById(R.id.eventDateTV);
+        eventTimeTV = findViewById(R.id.eventTimeTV);
+    }
+
+    public void saveEventAction(View view)
+    {
+        String eventName = eventNameET.getText().toString();
+        Event newEvent = new Event(eventName, CalendarUtils.selectedDate, time);
+        Event.eventsList.add(newEvent);
+        finish();
+    }
+}