检查滚动型比画面/滚动较高 [英] Check if ScrollView is higher than screen / scrollable

问题描述

我怎么能检查是否滚动型比屏幕高？当滚动型的内容在屏幕上适合的滚动型不滚动，当它的内容超出屏幕高度，它的滚动。 如何检查在这方面滚动型的条件？

How can I check if a ScrollView is higher than the screen? When the content of a ScrollView fits on the screen, the ScrollView isn't scrollable, when it's contents exceed the screen height it's scrollable. How can I check the condition of a ScrollView in that regard?

推荐答案

这是滚动型，这是私人的code，但可以适于类本身以外使用

This is the code from ScrollView, which is private, but can be adapted to be used outside of the class itself

/**
 * @return Returns true this ScrollView can be scrolled
 */
private boolean canScroll() {
    View child = getChildAt(0);
    if (child != null) {
        int childHeight = child.getHeight();
        return getHeight() < childHeight + mPaddingTop + mPaddingBottom;
    }
    return false;
}

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