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POAndroid Spannable Line Height
 

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  1. POAndroid Spannable Line Height
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    <p>I have been trying to figure this one out for the last couple of days now, and have had no success...</p> <p>I'm learning android right now, and am currently creating a calculator with history as my learning project. I have a TextView that is responsible for displaying all history... I'm using a digital font that looks like a calculator font, but this only looks good for digits and decimals and comma's. I want all operators to be highlighted and in a different font (Arial Narrow at the moment). I have been able to get this to work beautifully using a spannable string where I'm specifying a font color as well as a font using a CustomTypeFaceSpan class to apply my custom fonts.</p> <p>The problem... When I mix the Typefaces, there seems to be an issue with the line height, so I found <a href="https://stackoverflow.com/questions/11111129/android-textview-individual-line-spacing-for-each-line" title="Post 11111129">this post</a> which demonstrates using another custom defined class to apply a line height to each added line of spannable text:</p> <pre><code>public class CustomLineHeightSpan implements LineHeightSpan{ private final int height; public CustomLineHeightSpan(int height){ this.height = height; } @Override public void chooseHeight(CharSequence text, int start, int end, int spanstartv, int v, FontMetricsInt fm) { fm.bottom += height; fm.descent += height; } } </code></pre> <p>This does not seem to work, and I can not figure out why. If I don't apply the different typefaces, then it displays as expected with no space above the first line, and about 5px spacing between lines. When I apply the alternate typefaces, there is a space of about 10 to 15px above the first line of text and the line spacing is about the same 10 to 15px.</p> <p>There is no difference in the font size, only the typeface. What am I missing. I implemented the CustomLineHeightSpan which implements LineHeightSpan and overrides the chooseHeight method. I call it like so:</p> <p>WordtoSpan.setSpan(new CustomLineHeightSpan(10), operatorPositions.get(ii), operatorPositions.get(ii) + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);</p> <p>It does not seem to matter what I put in the call to CustomLineHeightSpan. Nothing changes...</p> <p>Anybody have any idea what I'm missing... I'm sure it's an "I can't believe I missed that" answer, but can't seem to figure it out at the moment.</p> <p>Thanks for the help guys :-)</p>
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