ReplacementSpan的draw（）方法是不叫 [英] ReplacementSpan's draw() method isn't called

问题描述

我设置背景字符串这样的：

I set background in string like that:

spanString.setSpan(new BackgroundColorSpan(color), 0, 3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

不过，我想增加左右填充在这样的背景下，所以我创建自定义的跨度

But I would like to increase left and right padding in this background so I created custom span

public class PaddingBackgroundSpan extends ReplacementSpan {
private int mBackgroundColor;
private int mForegroundColor;

public PaddingBackgroundSpan(int backgroundColor, int foregroundColor) {
    this.mBackgroundColor = backgroundColor;
    this.mForegroundColor = foregroundColor;
}

@Override
public int getSize(Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {
    return Math.round(measureText(paint, text, start, end));

}

@Override
public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
    RectF rect = new RectF(x, top, x + measureText(paint, text, start, end), bottom);
    paint.setColor(mBackgroundColor);
    canvas.drawRect(rect, paint);
    paint.setColor(mForegroundColor);
    canvas.drawText(text, start, end, x, y, paint);
}

private float measureText(Paint paint, CharSequence text, int start, int end) {
    return paint.measureText(text, start, end);
}

我用我的范围是：

I use my span by:

spanString.setSpan(new PaddingBackgroundSpan(color1, color2), 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

不幸的是，我的draw（）方法将不会调用。的getSize（）是正确调用。

Unfortunately, my draw() method isn't called. getSize() is called correctly.

推荐答案

在情况下，任何人有这个问题，我遇到过。我所要做的是通过第二个参数到setText（）方法。我的电话看起来像

In case anyone has this problem, I encountered it. What I had to do is to pass a second parameter into the setText() method. My call looked like

textView.setText(spanned, TextView.BufferType.SPANNABLE);

希望这有助于！

Hope this helps!

这篇关于ReplacementSpan的draw（）方法是不叫的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！