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I want to create special characters for math, for an android application.
And I wonder if it’s is possible to overlay one character on top of another, or if there is some fine control on how text is rendered (and how do you go about doing that).
If you need a general method to display math equations, have a look at jqMath. I think you can render it using a
WebView.Many math symbols have Unicode code points. Specifically, the Unicode code point for the symbol of a ‘+’ inside a circle is U+2295. They can be rendered directly if the font supports it. For a list of some math symbols with corresponding Unicode code points check this Wikipedia article.
Also have a look at this question for resources using MathML in Java.