public R paramsToJsonEntity(String elapsedFieldInJsonStreamer){
  try {
    mHttpEntity=createJsonStreamerEntity(elapsedFieldInJsonStreamer);
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
  return (R)this;
}

public R paramsToJsonEntity ( String elapsedFieldInJsonStreamer ) { try { mHttpEntity = createJsonStreamerEntity ( elapsedFieldInJsonStreamer ) ; } catch ( IOException e ) { e . printStackTrace ( ) ; } return ( R ) this ; }
convert params to json entity .
