Aligning ImageSpan to the top of the TextView

android, spannablestring, textview

Solution

What you can do is use a custom `MetricAffectingSpan` for maintaining its ratio like,

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);
    }
}

And the you can use `SpannableString` to apply asterisk to your String like,

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);

This is append asterisk to your text as you required. And your output will be as,

Problem

Currently, I wish to add an image in between texts and align it to the top of the TextView. Something like this: The only vertical alignments I can find are baseline (which seems to put it right down the center of the text) and align bottom. What happens if I use ALIGN_BASELINE is: Is there a way to align it to the top instead? My current code: ``` txtView.setText(this.addImageAsterisk( "The string to have asterisk at the end*"), BufferType.SPANNABLE); ``` then ``` 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; } ``` removing ImageSpan.ALIGN_BASELINE sets it to align to the bottom which is also not my expected result. --- Thank you user Lalit Poptani, I tried applying your answer---- after applying this, what happens is that the whole textview seems to have extra margin top. before applying span: ``` This is the text* ``` after applying the SuperscriptSpanAdjuster ``` (some extra space) This is the text* ``` My code: ``` 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); ```

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