Android NumberPicker animate wheel when using setValue method

Question

i m trying to get the wheel of the numberPicker animated. I found the corresponding question here:

How to change NumberPicker's value with animation?

But i cannot solve it with the suppposed answers. Can somebody please help me?

When changing the value of the numberPicker from lets say 100 to 200, i want the wheel to increment from the old value to the new one. The wheel should slide to the new value. In the link passsy solved it with reflection but i don t know how to use it in practice..

Answer 1

It's really simple if you want to increment the value by one.

just call changeValueByOne(myNumberPicker, true); to increment the numberpicker by one with animation. (false to decrement)

increment from 100-200 is not possible with this method

            /**
             * using reflection to change the value because
             * changeValueByOne is a private function and setValue
             * doesn't call the onValueChange listener.
             * 
             * @param higherPicker
             *            the higher picker
             * @param increment
             *            the increment
             */
            private void changeValueByOne(final NumberPicker higherPicker, final boolean increment) {

            Method method;
            try {
                // refelction call for
                // higherPicker.changeValueByOne(true);
                method = higherPicker.getClass().getDeclaredMethod("changeValueByOne", boolean.class);
                method.setAccessible(true);
                method.invoke(higherPicker, increment);

            } catch (final NoSuchMethodException e) {
                e.printStackTrace();
            } catch (final IllegalArgumentException e) {
                e.printStackTrace();
            } catch (final IllegalAccessException e) {
                e.printStackTrace();
            } catch (final InvocationTargetException e) {
                e.printStackTrace();
            }
        }