Android完美支持MathML显示公式方程
2024-06-18 01:58:01
Android完美支持MathML显示公式方程
- 一、目标
- 二、设计思路
- 三、实现过程
- 1. 实现方案
- 2. 参考文章
- 3. 测试结果
- 4. 检测MathML
- 四、遗留问题
- 五、Next
- 六、Finally
- 七、Appendix
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历经3个开发阶段《Android实现方程编辑器》、《Android完美解决LaTeX中文显示问题》、《Android判断LaTeX是否为空方程》后，『神马笔记』的方程编辑器现已经完美支持LaTeX，接下来尝试支持MathML。
一、目标
『神马笔记』支持MathML显示公式方程。
二、设计思路
在MathML之前，『神马笔记』已经完美支持LaTeX。
最快速实现支持MathML的方式是将MathML转化为LaTeX语言。
这样一来，后续的解析渲染就可以复用LaTeX的实现，不需要再次开发。
三、实现过程
1. 实现方案
| 方案 | 描述 | 参考资料 |
|---|---|---|
| JMathTeX | The library uses the typesetting algorithms of the well-known TeX and LaTeX systems and therefore displays formulas in a very professional looking way. Formulas are Java-objects that can be built from scratch (by combining smaller formulas in several ways) and from LaTeX strings. There is also limited support for MathML. | http://jmathtex.sourceforge.net/ |
| MathParser | MathParser is a freeware tool that converts MathML into LaTeX. It processes pure MathML code as well as HTML with embedded MathML. It also offers a special built-in parser for Mathcad HTML/MathML files. You do not have to retype all equations for publishing anymore. | http://www.tilman.de/programme/mathparser/index_en.html |
| fMath | FMATH is a FREE solution to display mathematics on web pages, desktop app or mobile devices using MathML, LaTeX or OMML (Microsoft Word) standards. | http://www.fmath.info/ |
| XSLT MathML Library | The XSLT MathML Library, xsltml, provides the XSLT developer with a set of XSLT templates for MathML 2.0 to LaTeX translation. These are implemented purely in XSLT, that is they do not use any extensions. | http://xsltml.sourceforge.net/ |
2. 参考文章
| 文章 | 地址 |
|---|---|
| 数学公式：使用xsltml将MathML转LaTex | https://www.jianshu.com/p/b4caef5bf1ab |
| java使用XSL+XML生成HTML文件 | http://www.blogjava.net/yangxiang/archive/2009/08/11/290688.html |
3. 测试结果
| 方案 | 结果 |
|---|---|
| JMathTeX |
根据JMathTeX介绍，对MathML提供了有限支持。 后来的项目转换过程中JMathTeX->JLaTeXMath->jlatexmath-android， 似乎移除了对MathML的支持。 |
| 后续有待查证。 | |
| MathParser | 采用替换的方式进行转换。 |
| 未达到预期效果，放弃之。 | |
| fMath | 使用JDOM2解析XML并进行转换，部分公式效果未达到预期，但可用。 |
| 备选方案。 | |
| XSLT MathML Library | 使用XSL方式转换，部分公式无法显示，但似乎优于fMath。 |
| 推荐方案。 |
4. 检测MathML
因为LaTeX和MathML使用同一个编辑框。因此需要自动检查用户输入的语言。
通过检索math>和<math两个关键字区分LaTeX和MathML。
public static final boolean isMathML(String text) {if (TextUtils.isEmpty(text)) {return false;}{int pos = text.lastIndexOf("math>");if (pos >= 0) {return true;}}{int pos = text.indexOf("<math");if (pos >= 0) {return true;}}return false;
}
四、遗留问题
附录中的公式来自于文章《Android完美解决LaTeX中文显示问题》，通过工具将LaTeX转换为MathML。
发现LaTeX能显示为多行的公式，使用MathML只显示一行。
未来有待查找问题根源。
五、Next
『神马笔记』的方程编辑器开发至此，已经实现了以下功能。
- 支持LaTeX和MathML
- 支持无效方程判断
- 支持空方程判定
- 支持LaTeX快捷输入栏
可能是Android平台最强大的方程编辑器了。
接下来将把方程编辑器整合到『神马笔记』中，以实现在笔记中插入方程。
六、Finally
～第一是早早归来～怕红萼无人为主～
七、Appendix
1.
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</math>
6.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mi>C</mi><mi>u</mi><mrow class="MJX-TeXAtom-REL"><munderover><mrow class="MJX-TeXAtom-OP MJX-fixedlimits"><mspace width="0pt" /><mo stretchy="false">⟶<!-- ⟶ --></mo></mrow><mrow class="MJX-TeXAtom-ORD"><mi mathvariant="normal">△<!-- △ --></mi></mrow><mrow class="MJX-TeXAtom-ORD"><msub><mi>H</mi><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msub><mi>S</mi><msub><mi>O</mi><mrow class="MJX-TeXAtom-ORD"><mn>4</mn></mrow></msub><mo stretchy="false">(</mo><mrow class="MJX-TeXAtom-ORD"><mo>浓</mo></mrow><mo stretchy="false">)</mo></mrow></munderover></mrow><mi>C</mi><mi>u</mi><mi>S</mi><msub><mi>O</mi><mrow class="MJX-TeXAtom-ORD"><mn>4</mn></mrow></msub><mrow class="MJX-TeXAtom-REL"><mover><mrow class="MJX-TeXAtom-OP MJX-fixedlimits"><mo stretchy="false">⟶<!-- ⟶ --></mo></mrow><mrow class="MJX-TeXAtom-ORD"><mi>N</mi><mi>a</mi><mi>O</mi><mi>H</mi><mrow class="MJX-TeXAtom-ORD"><mo>溶</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>液</mo></mrow></mrow></mover></mrow><mi>C</mi><mi>u</mi><mo stretchy="false">(</mo><mi>O</mi><mi>H</mi><msub><mo stretchy="false">)</mo><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msub>
</math>
7.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mfrac><mrow class="MJX-TeXAtom-ORD"><mrow class="MJX-TeXAtom-ORD"><mo>溶</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>解</mo></mrow></mrow><mrow><mo stretchy="false">⟶<!-- ⟶ --></mo><mrow class="MJX-TeXAtom-ORD"><mo>黏</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>液</mo></mrow><mo stretchy="false">→<!-- → --></mo><mrow class="MJX-TeXAtom-ORD"><mo>体</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>壁</mo></mrow><mo stretchy="false">→<!-- → --></mo><mrow class="MJX-TeXAtom-ORD"><mo>毛</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>细</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>血</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>管</mo></mrow><mo stretchy="false">→<!-- → --></mo></mrow></mfrac>
</math>
8.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mi>a</mi><mo>+</mo><mi>b</mi><mrow class="MJX-TeXAtom-ORD"><mi mathvariant="bold">i</mi></mrow><mrow class="MJX-TeXAtom-ORD"><mo>和</mo></mrow><mi>a</mi><mo>+</mo><mi>b</mi><mrow class="MJX-TeXAtom-ORD"><mi mathvariant="bold">i</mi></mrow>
</math>
9.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mfrac><mrow><mrow class="MJX-TeXAtom-ORD"><mo>电</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>梯</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>上</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>升</mo></mrow><mn>10</mn><mrow class="MJX-TeXAtom-ORD"><mo>米</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>里</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>做</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>的</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>功</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mphantom><mrow class="MJX-TeXAtom-ORD"><mo>电</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>梯</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>上</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>升</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>米</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>里</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>做</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>的</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>功</mo></mrow></mphantom></mrow></mrow><mrow><mrow class="MJX-TeXAtom-ORD"><mo>电</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>梯</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>上</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>升</mo></mrow><mn>10</mn><mrow class="MJX-TeXAtom-ORD"><mo>米</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>花</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>的</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>时</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>间</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mphantom><mrow class="MJX-TeXAtom-ORD"><mo>电</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>梯</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>上</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>升</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>米</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>花</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>的</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>时</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>间</mo></mrow></mphantom></mrow></mrow></mfrac>
</math>
10.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mn>3</mn><mi>F</mi><mi>e</mi><mo>+</mo><mn>2</mn><msub><mi>O</mi><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msub><mover><mrow class="MJX-TeXAtom-OP"><mstyle scriptlevel="1"><mtable rowspacing="0.1em" columnspacing="0em" displaystyle="false"><mtr><mtd><mo>=</mo><mspace width="negativethinmathspace" /><mo>=</mo><mspace width="negativethinmathspace" /><mo>=</mo><mspace width="negativethinmathspace" /><mo>=</mo><mspace width="negativethinmathspace" /><mo>=</mo><mspace width="negativethinmathspace" /><mo>=</mo></mtd></mtr></mtable></mstyle></mrow><mrow class="MJX-TeXAtom-ORD"><mrow class="MJX-TeXAtom-ORD"><mo>点</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>燃</mo></mrow></mrow></mover><mo>⁡<!-- --></mo><mi>F</mi><msub><mi>e</mi><mrow class="MJX-TeXAtom-ORD"><mn>3</mn></mrow></msub><msub><mi>O</mi><mrow class="MJX-TeXAtom-ORD"><mn>4</mn></mrow></msub>
</math>
11.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mi mathvariant="normal">C</mi><msub><mi mathvariant="normal">O</mi><mn>2</mn></msub><mo>+</mo><mn>4</mn><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mspace width="thickmathspace" /><munderover><mrow class="MJX-TeXAtom-OP"><mstyle scriptlevel="1"><mtable rowspacing="0.1em" columnspacing="0em" displaystyle="false"><mtr><mtd><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo stretchy="false">⇀<!-- ⇀ --></mo></mtd></mtr><mtr><mtd><mo stretchy="false">↽<!-- ↽ --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo></mtd></mtr></mtable></mstyle></mrow><mrow class="MJX-TeXAtom-ORD"><mi mathvariant="normal">△<!-- △ --></mi></mrow><mrow class="MJX-TeXAtom-ORD"><mi mathvariant="normal">p</mi><mi mathvariant="normal">h</mi><mi mathvariant="normal">a</mi><mi mathvariant="normal">n</mi><mi mathvariant="normal">t</mi><mi mathvariant="normal">o</mi><mi mathvariant="normal">m</mi></mrow></munderover><mspace width="thickmathspace" /><mi mathvariant="normal">C</mi><msub><mi mathvariant="normal">H</mi><mn>4</mn></msub><mo>+</mo><mn>2</mn><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi>
</math>
12.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><munderover><mrow class="MJX-TeXAtom-OP"><mstyle scriptlevel="1"><mtable rowspacing="0.1em" columnspacing="0em" displaystyle="false"><mtr><mtd><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo stretchy="false">⇀<!-- ⇀ --></mo></mtd></mtr><mtr><mtd><mo stretchy="false">↽<!-- ↽ --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo><mspace width="negativethinmathspace" /><mo>−<!-- − --></mo></mtd></mtr></mtable></mstyle></mrow><mrow class="MJX-TeXAtom-ORD"><mi mathvariant="normal">△<!-- △ --></mi></mrow><mrow class="MJX-TeXAtom-ORD"><mrow class="MJX-TeXAtom-ORD"><mo>催</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>化</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>剂</mo></mrow></mrow></munderover>
</math>
13.
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mrow class="MJX-TeXAtom-ORD"><mo>解</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>：</mo></mrow><mo>∵</mo><mi>A</mi><mo>∪<!-- ∪ --></mo><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo>,</mo><mspace width="thinmathspace" /><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>则</mo></mrow><mi>A</mi><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mi>B</mi><mrow class="MJX-TeXAtom-ORD"><mo>均</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>为</mo></mrow><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo>,</mo><mspace width="thinmathspace" /><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>的</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>子</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>集</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mspace linebreak="newline" /><mrow class="MJX-TeXAtom-ORD"><mo>即</mo></mrow><mi>A</mi><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mi>B</mi><mo>∈<!-- ∈ --></mo><mo fence="false" stretchy="false">{</mo><mi class="MJX-variant">∅<!-- ∅ --></mi><mo>,</mo><mspace width="thinmathspace" /><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo fence="false" stretchy="false">}</mo><mo>,</mo><mspace width="thinmathspace" /><mo fence="false" stretchy="false">{</mo><mn>2</mn><mo fence="false" stretchy="false">}</mo><mo>,</mo><mspace width="thinmathspace" /><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo>,</mo><mspace width="thinmathspace" /><mn>2</mn><mo fence="false" stretchy="false">}</mo><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mspace linebreak="newline" /><mrow class="MJX-TeXAtom-ORD"><mo>当</mo></mrow><mi>A</mi><mo>=</mo><mi class="MJX-variant">∅<!-- ∅ --></mi><mrow class="MJX-TeXAtom-ORD"><mo>时</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo>,</mo><mspace width="thinmathspace" /><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mspace linebreak="newline" /><mrow class="MJX-TeXAtom-ORD"><mo>当</mo></mrow><mi>A</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>时</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo>,</mo><mspace width="thinmathspace" /><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>或</mo></mrow><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mspace linebreak="newline" /><mrow class="MJX-TeXAtom-ORD"><mo>当</mo></mrow><mi>A</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>时</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo>,</mo><mspace width="thinmathspace" /><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>或</mo></mrow><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mspace linebreak="newline" /><mrow class="MJX-TeXAtom-ORD"><mo>当</mo></mrow><mi>A</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo>,</mo><mspace width="thinmathspace" /><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>时</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo>,</mo><mspace width="thinmathspace" /><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>或</mo></mrow><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>或</mo></mrow><mi>B</mi><mo>=</mo><mo fence="false" stretchy="false">{</mo><mn>2</mn><mo fence="false" stretchy="false">}</mo><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>或</mo></mrow><mi>B</mi><mo>=</mo><mi class="MJX-variant">∅<!-- ∅ --></mi><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mspace linebreak="newline" /><mrow class="MJX-TeXAtom-ORD"><mo>共</mo></mrow><mn>9</mn><mrow class="MJX-TeXAtom-ORD"><mo>种</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>情</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>况</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>，</mo></mrow><mspace linebreak="newline" /><mrow class="MJX-TeXAtom-ORD"><mo>故</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>选</mo></mrow><mrow class="MJX-TeXAtom-ORD"><mo>：</mo></mrow><mi>D</mi>
</math>
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