椭圆化 TextView 中 SpannableString 的单行 [英] Ellipsize individual lines of a SpannableString in a TextView

问题描述

我有一个 TextView 存储一个两行长的地址.这条街在第一行并且是粗体的.城市与状态在第二行并且不是粗体.如果该行上的单个文本超出，我希望每行的末尾都被省略.我正在使用 SpannableString 来存储地址，因为我希望街道地址为粗体，而城市 &状态不要粗体.

I have a TextView storing an address that is two lines long. The street goes on the first line and is bold. The city & state go on the second line and are not bold. I want the end of each line ellipsized if the individual text on that line runs over. I'm using a SpannableString to store the address because I want the street address to be bold and the city & state to be not bold.

有没有一种方法可以在不为每行使用两个 TextViews 的情况下做到这一点?

Is there a way to do this that isn't a total hack without using two TextViews for each line?

示例输出:

例如:
123812 华盛顿...
纽约斯克内克塔迪...

Ex:
123812 Washington A...
Schenectady New Yor...

例如:
2792 丹茨勒大道...
查尔斯顿 SC，29406

Ex:
2792 Dantzler Boulev...
Charleston SC, 29406

例如:
3大街
乔治亚州亚特兰大

Ex:
3 Main Street
Atlanta GA

推荐答案

我有同样的问题，并通过创建一个 EllipsizeLineSpan 类解决了它.你可以用它包裹你想要省略的每一行.

I had the same problem and solved it by creating an EllipsizeLineSpan class. You can wrap each line that you want to ellipsize with it.

用它标记可跨字符串的示例:

Example for marking up a spannable string with it:

SpannableStringBuilder textspan = new SpannableStringBuilder("#1.Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
"+
    "Protect from ellipsizing #2.Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
"+
    "#3.Lorem ipsum dolor sit amet, consectetur adipisicing elit
"+
    "#4.Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
");

// find  ellipsizable text (from '#' to newline)
Pattern pattern = Pattern.compile("#.*\n", Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(textspan);
while(matcher.find()) {
    textspan.setSpan(new EllipsizeLineSpan(), matcher.start(), matcher.end(),   Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

椭圆大小线跨度:

public class EllipsizeLineSpan extends ReplacementSpan implements LineBackgroundSpan {
int layoutLeft = 0;
int layoutRight = 0;

public EllipsizeLineSpan () {
}

@Override
public void drawBackground (Canvas c, Paint p,
                            int left, int right,
                            int top, int baseline, int bottom,
                            CharSequence text, int start, int end,
                            int lnum) {
    Rect clipRect = new Rect();
    c.getClipBounds(clipRect);
    layoutLeft = clipRect.left;
    layoutRight = clipRect.right;
}

@Override
public int getSize (Paint paint, CharSequence text, int start, int end,
                    Paint.FontMetricsInt fm) {
    return layoutRight - layoutLeft;
}

@Override
public void draw (Canvas canvas, CharSequence text, int start, int end,
                  float x, int top, int y, int bottom, Paint paint) {
    float textWidth = paint.measureText(text, start, end);

    if (x + (int) Math.ceil(textWidth) < layoutRight) {  //text fits
        canvas.drawText(text, start, end, x, y, paint);
    } else {
        float ellipsiswid = paint.measureText("u2026");
        // move 'end' to the ellipsis point
        end = start + paint.breakText(text, start, end, true, layoutRight - x - ellipsiswid, null);
        canvas.drawText(text, start, end, x, y, paint);
        canvas.drawText("u2026", x + paint.measureText(text, start, end), y, paint);

    }

}


}

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