public class MainActivity extends Activity {

  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    SpannableString spannable = new SpannableString("aasdfasasdfasdfasdf span span");
    spannable.setSpan(
      new LineBackgroundSpan() {
        @Override public void drawBackground(Canvas c, Paint p, int left, int right, int top, int baseline, int bottom,
                                             CharSequence text, int start, int end, int lnum) {
          Log.d("Sample", lnum + "line called");
        }
      }, 19, 28, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
    );

    TextView textView = (TextView) findViewById(R.id.text);
    textView.setText(spannable);
  }
}