gistfile1.java

private Context context;
private TextExpansionListener listener;

public ExpandHandler(Context context, TextExpansionListener listener){

    this.context = context;
    this.listener = listener;
}

public void handleTagNode(TagNode node, final SpannableStringBuilder builder,
        final int start, final int end) {

    final CharSequence text = builder.subSequence(start, end);

    builder.delete(start, end);
    builder.insert(start, " ");

    Bitmap bitmap = null;
    try {
        bitmap = BitmapFactory.decodeStream(context.getAssets().open("ic_launcher.png"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    Drawable drawable = new BitmapDrawable(context.getResources(), bitmap);
    drawable.setBounds(0, 0, bitmap.getWidth() - 1,
            bitmap.getHeight() - 1);

    builder.setSpan(new ImageSpan(drawable), start, start+1,
            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);



    ClickableSpan click_span = new ClickableSpan() {

        @Override
        public void onClick(View arg0) {

            Toast.makeText(context, "Image clicked", Toast.LENGTH_SHORT).show();

            this.expansionListener.expandText( text, start, end );
        }

    };

    builder.setSpan(click_span, start, start+1, 
            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);


}