Weekview

attrs,xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="DayView">
        <attr name="day_position" format="integer"/>
        <attr name="checked" format="boolean"/>
    </declare-styleable>

DayView.java

public class DayView extends LinearLayout implements View.OnClickListener {
    private boolean isChecked = false;
    private OnCheckedChangeListener changeListener;
    private TextView textView;
    private Enums.WeekDays day;

    public DayView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
        initAttrs(attrs);
        updateView();
    }

    public DayView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
        initAttrs(attrs);
        updateView();
    }

    private void init() {
        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.view_day, this, true);
        textView = (TextView) view.findViewById(R.id.day_tv);
        setOnClickListener(this);
    }

    private void initAttrs(AttributeSet attrs) {
        TypedArray a = getContext().getTheme().obtainStyledAttributes(attrs, R.styleable.DayView, 0, 0);
        try {
            isChecked = a.getBoolean(R.styleable.DayView_checked, false);
            int dayPosition = a.getInteger(R.styleable.DayView_day_position, 0);
            day = Enums.WeekDays.values()[dayPosition];
        } finally {
            a.recycle();
        }
    }

    public void updateView() {
        textView.setActivated(isChecked);
        textView.setText(day.oneLetterResId);
    }


    public void setOnCheckedChangeListener(OnCheckedChangeListener changeListener) {
        this.changeListener = changeListener;
    }

    @Override
    public void onClick(View v) {
        setChecked(!isChecked);
        if (changeListener != null) {
            changeListener.onCheckedChanged(day, isChecked);
        }
    }

    public boolean isChecked() {
        return isChecked;
    }

    public void setChecked(boolean isChecked) {
        this.isChecked = isChecked;
        textView.setActivated(isChecked);
    }

    public Enums.WeekDays getDay() {
        return day;
    }

    public interface OnCheckedChangeListener {
        void onCheckedChanged(Enums.WeekDays day, boolean isChecked);
    }
}

gistfile1.txt

  public enum WeekDays {
        SUNDAY("Sunday", R.string.sunday_one_letter, R.string.sunday),
        MONDAY("Monday", R.string.monday_one_letter, R.string.monday),
        TUESDAY("Tuesday", R.string.tuesday_one_letter, R.string.tuesday),
        WEDNESDAY("Wednesday", R.string.wednesday_one_letter, R.string.wednesday),
        THURSDAY("Thursday", R.string.thursday_one_letter, R.string.thursday),
        FRIDAY("Friday", R.string.friday_one_letter, R.string.friday),
        SATURDAY("Saturday", R.string.saturday_one_letter, R.string.saturday);

        public String name;
        public int oneLetterResId;
        public int titleResId;

        WeekDays(String name, int oneLetterResId, int titleResId) {
            this.name = name;
            this.oneLetterResId = oneLetterResId;
            this.titleResId = titleResId;
        }

        public static WeekDays getWeekDayFromString(String day) {
            WeekDays result = null;
            for (WeekDays weekday : WeekDays.values()) {
                if (weekday.name.equals(day)) {
                    result = weekday;
                }
            }
            return result;
        }
    }
    
       <string name="sunday">Sunday</string>
    <string name="saturday">Saturday</string>
    <string name="friday">Friday</string>
    <string name="thursday">Thursday</string>
    <string name="wednesday">Wednesday</string>
    <string name="tuesday">Tuesday</string>
    <string name="monday">Monday</string>
    <string name="sunday_one_letter">S</string>
    <string name="saturday_one_letter">S</string>
    <string name="friday_one_letter">F</string>
    <string name="thursday_one_letter">T</string>
    <string name="wednesday_one_letter">W</string>
    <string name="tuesday_one_letter">T</string>
    <string name="monday_one_letter">M</string>

layout

 <WeekView
            android:id="@+id/week_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:paddingBottom="10dp"
            android:paddingLeft="20dp"
            android:paddingRight="20dp"
            android:paddingTop="10dp">

            <DayView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                app:day_position="0"/>

            <DayView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                app:day_position="1"/>

            <DayView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                app:day_position="2"/>

            <DayView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                app:day_position="3"/>

            <DayView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                app:day_position="4"/>

            <DayView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                app:day_position="5"/>

            <DayView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                app:day_position="6"/>

        </FrequencyView>

WeekView.java

public class WeekView extends LinearLayout implements DayView.OnCheckedChangeListener {
    private List<DayView> dayViewList = new ArrayList<>();
    private List<Enums.WeekDays> days = new ArrayList<>();
    private OnFrequencyChangeListener changeListener;

    public WeekView(Context context) {
        super(context);
    }

    public WeekView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void addView(View child, int index, android.view.ViewGroup.LayoutParams params) {
        if (child instanceof DayView) {
            DayView button = (DayView) child;
            button.setOnCheckedChangeListener(this);
            dayViewList.add(button);
        }
        super.addView(child, index, params);
    }

    @Override
    public void onCheckedChanged(Enums.WeekDays day, boolean isChecked) {
        if (isChecked) {
            if (!days.contains(day)) {
                days.add(day);
            }
        } else {
            if (days.contains(day)) {
                days.remove(day);
            }
        }
        if (changeListener != null) {
            changeListener.onChange(days);
        }
    }

    public void setDays(List<Enums.WeekDays> days) {
        this.days = days;
        for (Enums.WeekDays day : days) {
            for (DayView dayView : dayViewList) {
                if (dayView.getDay().equals(day)) {
                    dayView.setChecked(true);
                }
            }
        }
    }

    public void setChangeListener(OnFrequencyChangeListener changeListener) {
        this.changeListener = changeListener;
    }

    public interface OnFrequencyChangeListener {
        void onChange(List<Enums.WeekDays> days);
    }
}