如何在 Android TextView 中使用自定义省略号 [英] How to use custom ellipsis in Android TextView

问题描述

我有一个 maxlines=3 的 TextView，我想使用我自己的省略号，而不是

I have a TextView with maxlines=3 and I would like to use my own ellipsis, instead of

"Lore ipsum ..."

我需要

"Lore ipsum ... [See more]"

为了给用户一个提示，点击视图会展开全文.

in order to give the user a clue that clicking on the view is going to expand the full text.

有可能吗?

我正在考虑检查 TextView 是否有省略号，在这种情况下添加文本[查看更多]"，然后在之前设置省略号，但我找不到这样做的方法.

I was thinking about check whether TextView has ellipsis and in such a case add the text "[See more]" and after that set ellipsis just before, but I couldn't find the way to do that.

也许如果我找到文本被剪切的位置，我可以禁用省略号并创建一个子字符串，然后添加... [查看更多]"，但我不知道如何获得该位置.

Maybe if I find the position where the text is cutted, I can disable the ellipsis and make a substring and later add "... [See more]", but again I dont know how to get that position.

推荐答案

我终于这样管理了(可能不是最好的):

I've finally managed it in this way (may be not the best one):

private void setLabelAfterEllipsis(TextView textView, int labelId, int maxLines){

    if(textView.getLayout().getEllipsisCount(maxLines-1)==0) {
        return; // Nothing to do
    }

    int start = textView.getLayout().getLineStart(0);
    int end = textView.getLayout().getLineEnd(textView.getLineCount() - 1);
    String displayed = textView.getText().toString().substring(start, end);
    int displayedWidth = getTextWidth(displayed, textView.getTextSize());

    String strLabel = textView.getContext().getResources().getString(labelId);
    String ellipsis = "...";
    String suffix = ellipsis + strLabel;

    int textWidth;
    String newText = displayed;
    textWidth = getTextWidth(newText + suffix, textView.getTextSize());

    while(textWidth>displayedWidth){
        newText = newText.substring(0, newText.length()-1).trim();
        textWidth = getTextWidth(newText + suffix, textView.getTextSize());
    }

    textView.setText(newText + suffix);
}

private int getTextWidth(String text, float textSize){
    Rect bounds = new Rect();
    Paint paint = new Paint();
    paint.setTextSize(textSize);
    paint.getTextBounds(text, 0, text.length(), bounds);

    int width = (int) Math.ceil( bounds.width());
    return width;
}

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