NumberPicker循环滚动

使用setWrapSelectorWheel(boolean wrapSelectorWheel) 设置是否循环滚动。而且必须在setMaxValue()和setMinValue() 的后面调用setWrapSelectorWheel() 才管用。
官方文档说明如下：

接下来我们看一下源代码。
在setMaxValue()和setMinValue()中调用了setWrapSelectorWheel() 。判断(mMaxValue - mMinValue)是否大于3（SELECTOR_WHEEL_ITEM_COUNT），如果大于3，则循环滚动。

    private static final int SELECTOR_WHEEL_ITEM_COUNT = 3;

    private final int[] mSelectorIndices = new int[SELECTOR_WHEEL_ITEM_COUNT];

    /**
     * Sets the max value of the picker.
     *
     * @param maxValue The max value inclusive.
     *
     * <strong>Note:</strong> The length of the displayed values array
     * set via {@link #setDisplayedValues(String[])} must be equal to the
     * range of selectable numbers which is equal to
     * {@link #getMaxValue()} - {@link #getMinValue()} + 1.
     */
    public void setMaxValue(int maxValue) {
        if (mMaxValue == maxValue) {
            return;
        }
        ......
        boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length;
        setWrapSelectorWheel(wrapSelectorWheel);
        ......
        invalidate();
    }

    /**
     * Sets the min value of the picker.
     *
     * @param minValue The min value inclusive.
     *
     * <strong>Note:</strong> The length of the displayed values array
     * set via {@link #setDisplayedValues(String[])} must be equal to the
     * range of selectable numbers which is equal to
     * {@link #getMaxValue()} - {@link #getMinValue()} + 1.
     */
    public void setMinValue(int minValue) {
        if (mMinValue == minValue) {
            return;
        }
        ......
        boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length;
        setWrapSelectorWheel(wrapSelectorWheel);
        ......
        invalidate();
    }

最后

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