Hi, if you have at minimum atom processor you can edit serveral formats easily but the power and availability limited in android and yes most of the file managers doesn't give support of editing code language format and some provide editing it will either lag or crash can be seen and main draw you can't edit multiple files for that if you individually try one after one.

This is very hard for users who insist or only have smartphone to work or edit any file of code at certain time's

Today, we provide you some apps and sites that may be useful in advanced editing of your format and editing several file side by easily.

AnEditor

An editor is free text editor for html, css, javascript and python 


Quikedit

Code editor and syntax highlight for 50+ languages (C++, C#, Java, XML, Javascript, Markdown, PHP, Perl, Python, Ruby, Smali, Swift, etc).

Yes, and also Optimized for both phones and tablets and fast and stable, must try

https://play.google.com/store/apps/details?id=com.rhmsoft.edit

Html editor By Code Play

A simple html editor with alot of features that other doesn't have and do provide outpu of code to.

https://play.google.com/store/apps/details?id=html.editor.codeplay

Mixplorer

A plenty of features and powerful code viewer and viewers support plenty of file systems. lagging editing in large files may be fixed soon

https://mixplorer.com/

Fx File Manager

These file have both free and paid versions and mainly it does provide good stable editor and can be alternative to mixplorer 

https://play.google.com/store/apps/details?id=nextapp.fx

But, lasting the quickedit and anwriter is our choice both have thier own user infeface if you le dark anwriters do provide if lite quickedit checkout the features and decide yourself 

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