android - 安卓。文本视图。文本的最后一个可见字符

Question

我有一个针对整个屏幕的 TextView 匹配，并在其上附加了一个文本。例如，乌鸦诗：

Once upon a midnight dreary, while I pondered, weak and weary,
Over many a quaint and curious volume of forgotten lore,
While I nodded, nearly napping, suddenly there came a tapping,
As of some one gently rapping, rapping at my chamber door.
"'Tis some visiter," I muttered, "tapping at my chamber door—
Only this, and nothing more." etc etc etc...

我无法在手机屏幕上看到所有内容。所以问题是：如何获得文本最后一个可见字符的索引？ 我怎么能看到它

标签： androidstringkotlintextviewmobile-development

Answer 1

非常感谢Mike M这里的答案：

fun TextView.getLastVisibleCharacter(): Int {
        val layoutBottom = height + scrollY - totalPaddingTop - totalPaddingBottom
        val bottomLine = layout.getLineForVertical(layoutBottom)
        val lastWhollyVisibleLineNumber =
            if (layout.getLineBottom(bottomLine) > layoutBottom) bottomLine - 1
            else bottomLine
        return layout.getLineVisibleEnd(lastWhollyVisibleLineNumber) - 1
    }