android - 调用需要 API 级别 14(当前最小值为 8): android. view.ViewGroup#canScrollHorizo​​ntally

Question

我收到这个错误:

Call requires API level 14 (current min is 8): android.view.ViewGroup#canScrollHorizontally.

我如何在 14 之前的 API 级别解决这个问题？

public class ViewPagerEx extends ViewGroup{
    @Override
    public boolean performAccessibilityAction(View host, int action, Bundle args) {
        if (super.performAccessibilityAction(host, action, args)) {
            return true;
        }
        switch (action) {
            case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: {
                if (canScrollHorizontally(1)) {
                    setCurrentItem(mCurItem + 1);
                    return true;
                }
            } return false;
            case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: {
                if (canScrollHorizontally(-1)) {
                    setCurrentItem(mCurItem - 1);
                    return true;
                }
            } return false;
        }
        return false;
    }

    public boolean canScrollHorizontally(int direction) {
        if (mAdapter == null) {
            return false;
        }
        final int width = getClientWidth();
        final int scrollX = getScrollX();
        if (direction < 0) {
            return (scrollX > (int) (width * mFirstOffset));
        } else if (direction > 0) {
            return (scrollX < (int) (width * mLastOffset));
        } else {
            return false;
        }
    }
}

Answer 1

来自@KenWolf 的建议:使用 support-v4库，您可以使用 ViewCompat 来检查:

// From within the View itself, just invoke the ViewCompat
// implementation with 'this' as the View parameter.
if (ViewCompat.canScrollHorizontally(this, 1)) {
    // ...
}