library/src/main/java/de/mrapp/android/view/drawable/CircularProgressDrawable.java
private Property<CircularProgressDrawable, Float> createSweepProperty() {
        return new Property<CircularProgressDrawable, Float>(Float.class, "arc") {

            @Override
            public Float get(final CircularProgressDrawable object) {
                return currentSweepAngle;
            }

            @Override
            public void set(final CircularProgressDrawable object, final Float value) {
                currentSweepAngle = value;
                invalidateSelf();
            }

        };
    }
private Property<CircularProgressDrawable, Float> createSweepProperty() {
        return new Property<CircularProgressDrawable, Float>(Float.class, "arc") {

            @Override
            public Float get(final CircularProgressDrawable object) {
                return currentSweepAngle;
            }

            @Override
            public void set(final CircularProgressDrawable object, final Float value) {
                currentSweepAngle = value;
                invalidateSelf();
            }

        };
    }
Creates and returns a property, which allows to animate the sweep angle of the progress
drawable.

@return The property, which has been created, as an instance of the class {@link Property}