使用setValue方法时，Android的NumberPicker动画轮 [英] Android NumberPicker animate wheel when using setValue method

问题描述

我试图让动画的numberPicker的车轮。我找到了相应的问题在这里：

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

<一个href=\"http://stackoverflow.com/questions/13500852/how-to-change-numberpickers-value-with-animation\">How与动画改变NumberPicker的价值？

但我不能与suppposed答案解决它。有人能帮帮我吗？

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

在改变numberPicker的值从可以说100到200，我想车轮与旧值到新的增量。车轮应滑动到新的价值。在链接passsy与反思解决它，但我不知道如何在实践中使用它。

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..

感谢。

推荐答案

，如果你想通过有一个以增加数值真的很简单。

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

只是叫 changeValueByOne（myNumberPicker，真实）; 一个动画递增numberpicker。 （假递减）

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

100-200增量是不可能用这种方法

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();
            }
        }

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