gistfile1.java

public class MyExpansionListener implements ExpansionListener {

  private TextView textView;

	public MyExpansionListener( TextView textView ) {
		this.textView = textView;
	}

	public void expandText( String fullText, int start, int end ) {
		String before = textView.getText().substring(0, start);
		String after = textView.getText().substring(end);

		textView.setText( before + fullText + after);
	}

}