HtmlRecycler

Converts a simple html page into A RecyclerView of native android widgets powered by Jsoup library and inspired by Medium Textview.

This is under development

Note

This library was design and developed by ME and we use this in our application which depends on a Content Management system and was never intended to replace browsers or act as one. this library simply gave us more control over html page than WebView

Add it to your project

dependencies {
    implementation 'com.github.m7mdra:HtmlRecycler:0.1.1'
}

This project is distributed using jitpack. Make sure you add it as a maven repository to your build.gradle

allprojects {
    repositories {
        maven { 
            url 'https://jitpack.io' 
        }
    }
}

Demo
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  • APK
  • Or simply git clone the repository and build the app module.

Currently supported html elements

  • [x] Paragraph
  • [x] H1...H6
  • [x] Image
  • [x] Video
  • [x] Audio
  • [x] Ordered List
  • [x] Unordered List
  • [x] Description List
  • [x] Anchor Link
  • [x] IFrame
  • [ ] Table
  • [x] DIV

Implementation

val networkSource = NetworkSource("https://gist.githubusercontent.com/m7mdra/f22c62bc6941e08064b4fbceb4832a90/raw/ea8574d986635cf214541f1f5702ef37cc731aaf/article.html")  
  
HtmlRecycler.Builder(this@MainActivity)  
    .setSource(networkSource)  
    .setAdapter(DefaultElementsAdapter(this@MainActivity) { element, i, view ->  
    }})
    .setRecyclerView(recyclerView)  
    .setLoadingCallback(object : HtmlRecycler.LoadCallback {  
        override fun onLoadingStart() {  
            progressBar.visibility = View.VISIBLE  
        }  
        override fun onLoaded(document: Document?) {  
            progressBar.visibility = View.GONE
  	}  
    })  
    .build()

The above code uses the existing implementation of DefaultElementsAdapter which extends ElementsAdapter class which inherently is a RecylcerView Adpater the DefaultElementsAdapter uses a layout resources files defined by me but they not styled probably and are very buggy (especially the video, audio and iframe ones).

Want to create your own adapter? just simply extend ElementsAdapter and override methods:

class BetterImplementationThanTheAuthorsAdapter : ElementsAdapter() {    
    override fun onCreateElement(parent: ViewGroup, elementType: ElementType): RecyclerView.ViewHolder {  
        when (elementType) {  
            ElementType.Paragraph -> {  
                return ParagraphViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.row_paragarph, parent, false))  
            }
	    // Define other elements here
        }  
    }  
  
    override fun onBindElement(holder: RecyclerView.ViewHolder, position: Int) {  
        val element = elements[position] //current element  
	    if (holder is ParagraphViewHolder){  
                val paragraphElement = element as ParagraphElement  
            	holder.paragraphText.text= paragraphElement.text  
	    }  
	}  
    }
}

Then replace the default adapter with your adapter:

HtmlRecycler.Builder(this)  
    .setSource(StringSource(Data.data))  
    .setAdapter(BetterImplementationThanTheAuthorsAdapter()) // this is a custom adapter  
    .setRecyclerView(recyclerView)  
    .build()

How to add Data

Data can come from different sources, the library support the following:

  • [x] Assets
  • [x] File
  • [x] String
  • [x] Network (runs on UI thread by default so you have to run it on different thread or write your own Source Implementation )

Write your own source

Simply implement the Source interface which will return a Document of the parsed Source:

class FileSource(val file: File) : Source {  
    override fun get(): Document {  
        return Jsoup.parse(file, "UTF-8")  
    }  
}

Attach Click listeners on elements

In DefaultElemetsAdapter class at line #27 l i defined a higher-order-function in the constructor method (which dose the same as defining an interface) and on line #75 we envoke the method passing our element and the position of the clicked view.

TODO list:

  • [ ] Define a standard Layout styling.
  • [x] allow NetworkSource to run on UI thread without crashing.
  • [ ] Support the following elements:
    • [ ] Table
    • [x] Div
    • [x] Section
  • [ ] Test Element Extractors for different data sets.
  • [x] add more control over paragraph element.
  • [ ] other thing that i come up with...

GitHub