Question

我有一个嵌套的LinearLayout（或其他类型的布局），我只想总结一下这个视图的边距/填充的所有水平值及其父级和潜在的祖父母等等。

我只需要此布局的清洁宽度，即window width minus all horizontal margins/paddings。

我是这样开始的：

private int sumMargins(View view) {
    LayoutParams params = (LayoutParams) view.getLayoutParams();
    int margins = params.leftMargin + params.rightMargin + view.getPaddingStart() + view.getPaddingEnd();

    ViewParent parent = view.getParent();
    while (parent != null) {
        // here I need to recursively gather all nested parents margins/paddings 
        // (add them to the `margins` variable)
    }

    return margins;
}

Answer 1

ViewGroup.MarginLayoutParams可让您访问视图的边距。以下代码将遵循视图层次结构，直至顶级DecorView和左/右边距和填充。

private int sumMargins(View view) {
    ViewGroup.MarginLayoutParams marginParams;
    int margins = 0;
    View decorView = getWindow().getDecorView();

    while (view != null && view != decorView) {
        marginParams = (ViewGroup.MarginLayoutParams) view.getLayoutParams();
        if (marginParams != null) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
                margins += marginParams.getMarginStart() + marginParams.getMarginEnd() +
                        view.getPaddingStart() + view.getPaddingEnd();
            } else {
                margins += marginParams.leftMargin + marginParams.rightMargin +
                        view.getPaddingLeft() + view.getPaddingRight();
            }
        }
        view = (View) view.getParent();
    }

    return margins;
}

获取水平边距/填充的总和

1 个答案: