将ImageSpan对齐到TextView的顶部

Question

目前,我希望在文本之间添加一个图像,并将其对齐到TextView的顶部.

像这样的东西:

我能找到的唯一垂直对齐是基线(似乎将它放在文本的中心)并对齐底部.

如果我使用ALIGN_BASELINE会发生什么:

有没有办法将它与顶部对齐？

我目前的代码:

    txtView.setText(this.addImageAsterisk(
        "The string to have asterisk at the end*"), BufferType.SPANNABLE);

然后

private CharSequence addImageAsterisk(String string) {
    Drawable d = context.getResources().getDrawable(R.drawable.img_asterisk); 

    ImageSpan imageSpan = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
    final SpannableString spannableString = new SpannableString(string);
    spannableString.setSpan(imageSpan, string.length()-1, string.length(), 0);
    return spannableString;
}

删除ImageSpan.ALIGN_BASELINE将其设置为与底部对齐,这也不是我预期的结果.

---感谢用户Lalit Poptani,我尝试应用你的答案----应用之后,会发生的事情是整个textview似乎有额外的余量.

在应用范围之前:

This is the text*

在应用SuperscriptSpanAdjuster之后

(some extra space)
This is the text*

我的代码:

String string = "This is the text*";
Drawable d = this.context.getResources().getDrawable(R.drawable.img_asterisk); 

d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight()); 

ImageSpan imageSpan = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
SuperscriptSpanAdjuster s = new SuperscriptSpanAdjuster(1.5);
final SpannableString spannableString = new SpannableString(string);
spannableString.setSpan(s, string.length() - 1, string.length(), 0);
spannableString.setSpan(imageSpan, string.length(), string.length() + 1, 0);
textView.setText(spannableString);

Answer 1

您可以做的是使用自定义MetricAffectingSpan维持其比例,如,

public class SuperscriptSpanAdjuster extends MetricAffectingSpan {
    double ratio = 0.5;

    public SuperscriptSpanAdjuster(double ratio) {
        this.ratio = ratio;
    }

    @Override
    public void updateDrawState(TextPaint paint) {
        paint.baselineShift += (int) (paint.ascent() * ratio);
    }

    @Override
    public void updateMeasureState(TextPaint paint) {
        paint.baselineShift += (int) (paint.ascent() * ratio);
    }
}

您可以使用SpannableString星号应用于您的字符串,如,

SpannableString mString = new SpannableString("This is what I wanted*");
mString.setSpan(new SuperscriptSpanAdjuster(0.5), mString.length() - 1, 
                     mString.length(), SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE);
mTextView.append("\n");
mTextView.append(mString);

这会根据您的需要在文本中添加星号.你的输出将是,