突出显示TextView中的文本行，包括所有宽度 [英] Highlight text row in TextView including all width

问题描述

我已经查看了如何使用 Spannable 类在 TextView 中突出显示某些文本的一些解决方案。但它只允许突出显示由字符组成的片段。如果我想突出显示包含 TextView 的宽度的文本行，但是此行中的文本不会填满整个视图的宽度，该怎么办？

I have already looked through some solutions of how to highlight some text in TextView using Spannable class. But it only allows to highlight a snippet which consists of characters. And what if I want to highlight a text row including TextView's width, but a text in this row doesn't fill whole view's width?

如果有人有这种情况的经验，我很乐意接受建议。

If anybody had an experience in such cases I would be glad to take an advice.

好的，我希望以下图片可以明确我的目标。

Ok, I hope following images will bring some clarity of my aim.

这是我可以用实现的：

这就是我想要的：

我真的希望它很清楚。

推荐答案

可能有一种更简单的方法可以执行此操作，但我相信您需要实现一个实现LineBackgroundSpan的类来执行您想要的操作。下面是一些示例代码：

There might be an easier way to do this, but I believe you will need to implement a class that implements LineBackgroundSpan to do what you want. Here's some sample code:

public class MyActivity extends Activity {

    private static class MySpan implements LineBackgroundSpan {
        private final int color;

        public MySpan(int color) {
            this.color = color;
        }

        @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) {
            final int paintColor = p.getColor();
            p.setColor(color);
            c.drawRect(new Rect(left, top, right, bottom), p);
            p.setColor(paintColor);
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final TextView tv = new TextView(this);
        setContentView(tv);

        tv.setText("Lines:\n", BufferType.EDITABLE);
        appendLine(tv.getEditableText(), "123456 123 12345678\n", Color.BLACK);
        appendLine(tv.getEditableText(), "123456 123 12345678\n", Color.RED);
        appendLine(tv.getEditableText(), "123456 123 12345678\n", Color.BLACK);
    }

    private void appendLine(Editable text, String string, int color) {
        final int start = text.length();
        text.append(string);
        final int end = text.length();
        text.setSpan(new MySpan(color), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    }
}

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