small numbers in CalendarView android

Question

I need the CalendarView for my app. But the numbers of the days are very small. How to make them bigger?

Answer 1

Apparently, it's a bug in the code for the CalendarView. Here's a reference to the bug. It's not a real answer, but more of an explanation, I guess.

https://code.google.com/p/android/issues/detail?id=34932

Allegedly, it's been fixed in 4.2.

Answer 2

If someone's still interested, here's my solution based on the info provided in Phil's post and on the report from XSJoJo. As mentioned there, the problem is present because the mDateTextSize isn't assigned to the mMonthNumDrawPaint in the CalendarViewLegacyDelegate. I'm using Java reflection.

    /**
     * I'm doing this in my fragment's onCreateView() callback
     */

    CalendarView calendarView = (CalendarView) contentView.findViewById(R.id.calendar_view);

    if (Build.VERSION.SDK_INT == Build.VERSION_CODES.JELLY_BEAN) { // this bug exists only in Android 4.1
        try {
            Object object = calendarView;
            Field[] fields = object.getClass().getDeclaredFields();
            for (Field field : fields) {
                if (field.getName().equals("mDelegate")) { // the CalendarViewLegacyDelegate instance is stored in this variable
                    field.setAccessible(true);
                    object = field.get(object);

                    break;
                }
            }

            Field field = object.getClass().getDeclaredField("mDateTextSize"); // text size integer value
            field.setAccessible(true);
            final int mDateTextSize = (Integer) field.get(object);

            field = object.getClass().getDeclaredField("mListView"); // main ListView
            field.setAccessible(true);
            Object innerObject = field.get(object);

            Method method = innerObject.getClass().getMethod(
                    "setOnHierarchyChangeListener", ViewGroup.OnHierarchyChangeListener.class); // we need to set the OnHierarchyChangeListener
            method.setAccessible(true);
            method.invoke(innerObject, (Object) new ViewGroup.OnHierarchyChangeListener() {
                @Override
                public void onChildViewAdded(View parent, View child) { // apply text size every time when a new child view is added
                    try {
                        Object object = child;
                        Field[] fields = object.getClass().getDeclaredFields();
                        for (Field field : fields) {
                            if (field.getName().equals("mMonthNumDrawPaint")) { // the paint is stored inside the view
                                field.setAccessible(true);
                                object = field.get(object);
                                Method method = object.getClass().
                                        getDeclaredMethod("setTextSize", float.class); // finally set text size
                                method.setAccessible(true);
                                method.invoke(object, (Object) mDateTextSize);

                                break;
                            }
                        }
                    } catch (Exception e) {
                        Log.e(APP_TAG, e.getMessage(), e);
                    }
                }

                @Override
                public void onChildViewRemoved(View parent, View child) {}
            });
        } catch (Exception e) {
            Log.e(APP_TAG, e.getMessage(), e);
        }
    }