Native Page splitter like Newspaper and Magazine for android

PageSplitter.java class

package com.sharathyadhav.utils;
import android.text.DynamicLayout;
import android.text.Layout;
import android.text.SpannableStringBuilder;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.Log;

import java.util.ArrayList;
import java.util.List;

public class PageSplitter {
    private final int pageWidth;
    private final int pageHeight;
    private final float lineSpacingMultiplier;
    private final float lineSpacingExtra;
    private final List<CharSequence> pages = new ArrayList<CharSequence>();
    private SpannableStringBuilder mSpannableStringBuilder = new SpannableStringBuilder();

    public PageSplitter(int pageWidth, int pageHeight, float lineSpacingMultiplier, float lineSpacingExtra) {
        this.pageWidth = pageWidth;
        this.pageHeight = pageHeight;
        this.lineSpacingMultiplier = lineSpacingMultiplier;
        this.lineSpacingExtra = lineSpacingExtra;
    }

    public void append(CharSequence charSequence) {
        mSpannableStringBuilder.append(charSequence);
    }

    public void split(TextPaint textPaint) {
        DynamicLayout staticLayout = new DynamicLayout(
                mSpannableStringBuilder,
                textPaint,
                pageWidth,
               null,
                lineSpacingMultiplier,
                lineSpacingExtra,
                true
        );
        int startLine = 0;

        while(startLine < staticLayout.getLineCount()) {
        // for(startLine =0; startLine< staticLayout.getLineCount(); startLine++) {
            int startLineTop = staticLayout.getLineTop(startLine);
            int endLine = staticLayout.getLineForVertical(startLineTop + pageHeight);
            int endLineBottom = staticLayout.getLineBottom(endLine);
            int lastFullyVisibleLine;
            if(endLineBottom > startLineTop + pageHeight){
                lastFullyVisibleLine = endLine - 1;
            }
            else{
                lastFullyVisibleLine = endLine;
                }
            int startOffset = staticLayout.getLineStart(startLine);
            Log.e("log", "######## :lastFullyVisibleLine::::   " + lastFullyVisibleLine);
            int endOffset = staticLayout.getLineEnd(lastFullyVisibleLine);
            pages.add(mSpannableStringBuilder.subSequence(startOffset, endOffset));
            startLine = lastFullyVisibleLine + 1;
        }
    }

    public List<CharSequence> getPages() {
   
    
        return pages;
    }

}





To use this in Activity

import android.app.Activity;

import android.os.Bundle;

import android.text.Html;

import android.text.TextPaint;

import android.util.DisplayMetrics;

import android.util.Log;

public class MainActivity extends Activity {

String htmlStrng ="<h1>Lorem ipsum dolor sit amet consectetuer adipiscing 

elit</h1>

<p>Lorem ipsum dolor sit amet, consectetuer adipiscing 

elit. Aenean commodo ligula eget dolor. Aenean massa 

<strong>strong</strong>. Cum sociis natoque penatibus 

et magnis dis parturient montes, nascetur ridiculus 

mus. Donec quam felis, ultricies nec, pellentesque 

eu, pretium quis, sem. Nulla consequat massa quis 

enim. Donec pede justo, fringilla vel, aliquet nec, 

vulputate eget, arcu. In enim justo, rhoncus ut, 

imperdiet a, venenatis vitae, justo. Nullam dictum 

felis eu pede <a class="external ext" href="#">link</a> 

mollis pretium. Integer tincidunt. Cras dapibus. 

Vivamus elementum semper nisi. Aenean vulputate 

eleifend tellus. Aenean leo ligula, porttitor eu, 

consequat vitae, eleifend ac, enim. Aliquam lorem ante, 

dapibus in, viverra quis, feugiat a, tellus. Phasellus 

viverra nulla ut metus varius laoreet. Quisque rutrum. 

Aenean imperdiet. Etiam ultricies nisi vel augue. 

Curabitur ullamcorper ultricies nisi.</p>

<h1>Lorem ipsum dolor sit amet consectetuer adipiscing 

elit</h1>

<h2>Aenean commodo ligula eget dolor aenean massa</h2>

<p>Lorem ipsum dolor sit amet, consectetuer adipiscing 

elit. Aenean commodo ligula eget dolor. Aenean massa. 

Cum sociis natoque penatibus et magnis dis parturient 

montes, nascetur ridiculus mus. Donec quam felis, 

ultricies nec, pellentesque eu, pretium quis, sem.</p>

<h2>Aenean commodo ligula eget dolor aenean massa</h2>

<p>Lorem ipsum dolor sit amet, consectetuer adipiscing 

elit. Aenean commodo ligula eget dolor. Aenean massa. 

Cum sociis natoque penatibus et magnis dis parturient 

montes, nascetur ridiculus mus. Donec quam felis, 

ultricies nec, pellentesque eu, pretium quis, sem.</p>

<ul>

  <li>Lorem ipsum dolor sit amet consectetuer.</li>

  <li>Aenean commodo ligula eget dolor.</li>

  <li>Aenean massa cum sociis natoque penatibus.</li>

</ul>

<p>Lorem ipsum dolor sit amet, consectetuer adipiscing 

elit. Aenean commodo ligula eget dolor. Aenean massa. 

Cum sociis natoque penatibus et magnis dis parturient 

montes, nascetur ridiculus mus. Donec quam felis, 

ultricies nec, pellentesque eu, pretium quis, sem.</p>

<form action="#" method="post">

  <fieldset>

    <label for="name">Name:</label>

    <input type="text" id="name" placeholder="Enter your 

full name" />

    <label for="email">Email:</label>

    <input type="email" id="email" placeholder="Enter 

your email address" />

    <label for="message">Message:</label>

    <textarea id="message" placeholder="What's on your 

mind?"></textarea>

    <input type="submit" value="Send message" />

  </fieldset>

</form>

<p>Lorem ipsum dolor sit amet, consectetuer adipiscing 

elit. Aenean commodo ligula eget dolor. Aenean massa. 

Cum sociis natoque penatibus et magnis dis parturient 

montes, nascetur ridiculus mus. Donec quam felis, 

ultricies nec, pellentesque eu, pretium quis, sem.</p>

<table class="data">

  <tr>

    <th>Entry Header 1</th>

    <th>Entry Header 2</th>

    <th>Entry Header 3</th>

    <th>Entry Header 4</th>

  </tr>

  <tr>

    <td>Entry First Line 1</td>

    <td>Entry First Line 2</td>

    <td>Entry First Line 3</td>

    <td>Entry First Line 4</td>

  </tr>

  <tr>

    <td>Entry Line 1</td>

    <td>Entry Line 2</td>

    <td>Entry Line 3</td>

    <td>Entry Line 4</td>

  </tr>

  <tr>

    <td>Entry Last Line 1</td>

    <td>Entry Last Line 2</td>

    <td>Entry Last Line 3</td>

    <td>Entry Last Line 4</td>

  </tr>

</table>

<p>Lorem ipsum dolor sit amet, consectetuer adipiscing 

elit. Aenean commodo ligula eget dolor. Aenean massa. 

Cum sociis natoque penatibus et magnis dis parturient 

montes, nascetur ridiculus mus. Donec quam felis, 

ultricies nec, pellentesque eu, pretium quis, sem.</p>

";

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

       

        DisplayMetrics dimension = new DisplayMetrics();

getWindowManager().getDefaultDisplay()

.getMetrics(dimension);

int w = dimension.widthPixels;

int h = dimension.heightPixels;

NativePageSplitter pageSplitter= new NativePageSplitter(w-70, h-70

, 1.2f, 1);

TextPaint textPaint = new TextPaint();

textPaint.setTextSize(15);

pageSplitter.append(Html.fromHtml(htmlStrng));

pageSplitter.split(textPaint);

String[] arr = new String[pageSplitter.getPages().size()];

for (int i = 0; i < pageSplitter.getPages().size(); i++) {

arr[i] = pageSplitter.getPages().get(i).toString();

}

    }

}

Use newsArray array to view pager automatically it will get split and placed in view pager