gistfile1.java

@Override
public void render(final String json){
  try{
    JSONObject jsonObj = new JSONObject(json);
    Iterator<?> keys = jsonObj.keys();

    while(keys.hasNext()){
      final String key = (String)keys.next();
      final String value = jsonObj.getString(key);
      this.runOnUiThread(new Runnable() {

        @Override
        public void run() {
          setFieldValue(key, value);
        }
      });
    }
  }catch(JSONException e){}
}  

protected void setFieldValue(String key, String value){
  if(key.equalsIgnoreCase("inCurrencies")){
    //TODO
  }else if(key.equalsIgnoreCase("outCurrencies")){
    //TODO
  }else if(key.equalsIgnoreCase("in_amount")){
    ((EditText)findViewById(R.id.unconvertedEditText)).setText(value);
  }else if(key.equalsIgnoreCase("out_amount")){
    ((TextView)findViewById(R.id.convertedTextView)).setText(value);
  }
}