// Create DocumentView and set plain text
// Important: Use DocumentLayout.class
DocumentView documentView = new DocumentView(this, DocumentLayout.class);  // Support plain text
documentView.getDocumentLayoutParams().setTextAlignment(TextAlignment.JUSTIFIED);
documentView.setText("Insert your text here", true); // Set to `true` to enable justification

/*
 * To mark a region for justification in Spanned strings, you must setSpan(new JustifySpan(), start, end)
 * that particular region.
 */

// Create span
Spannable span = new SpannableString("In New York and New Jersey, governors Andrew Cuomo and Chris Christie have implemented controversial quarantines.");

// Set region to justify
span.setSpan(new JustifySpan(), 0, span.length(), Spannable.SPAN_INCLUSIVE_EXCLUSIVE);

// Create DocumentView and set span.
// Important: Use SpannedDocumentLayout.class
DocumentView documentView = new DocumentView(this, SpannedDocumentLayout.class);  // Support spanned text

// Set the fallback alignment if an alignment is not specified for a line
documentView.getDocumentLayoutParams().setTextAlignment(TextAlignment.JUSTIFIED); 

documentView.setText(span, true); // Set to `true` to enable justification

/*
 * Class that builds spanned documents and enables multiple Spans to be set at once
 * to the last inserted text
 */

// Helper class; NOT required for DocumentView
class ArticleBuilder extends SpannableStringBuilder {
    public ArticleBuilder append(CharSequence text, boolean newline, Object ... spans){
        int start = this.length();
        this.append(Html.fromHtml("<p>" + text + "</p>" + (newline ? "<br>" : "")));
        for(Object span : spans) {
            this.setSpan(span, start, this.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
        }
        return this;
    }
}

// NOTE: ArticleBuilder is NOT required for DocumentView to work.
//       It is just a helper class I made to make it easier to add
//       multiple spans to a certain text.
ArticleBuilder a = new ArticleBuilder();
a.append("WHO: Ebola Cases",
          false, new RelativeSizeSpan(2f), new StyleSpan(Typeface.BOLD))
 .append("<font color=0xFFC801>Sam Frizell</font><font color=0x888888> @Sam_Frizell  Oct. 25, 2014</font>",
          false, new RelativeSizeSpan(0.8f), new StyleSpan(Typeface.BOLD))
 .append("In New York and New Jersey, governors Andrew Cuomo and Chris Christie have implemented controversial quarantines on all healthcare workers returning from West Africa after a doctor returning from Guinea contracted the disease and was diagnosed in New York.",
          true, new RelativeSizeSpan(1f), new JustifySpan());

DocumentView documentView = new DocumentView(this, SpannedDocumentLayout.class);  // Support spanned text
documentView.setText(a, true); // Set to `true` to enable justification