我在应用程序启动的两个日期之间检索数据，Redundancey控件？

当我的主要活动开始时我想要避免在一天中调用此方法一次，其余的我想要缓存时调用此方法

public void getApod(String date){

String api_url = "https://api.nasa.gov/planetary/apod?api_key="+API_KEY+"&date="+date;
JSONObject jsonObject = jsonParser.getJSONFromUrl(api_url, null);
Log.e("DATE", date.toString());
try {
    explanation = jsonObject.get("explanation").toString();
    image_url = jsonObject.get("url").toString();
    title = jsonObject.get("title").toString();
    publish_date = jsonObject.get("date").toString();
    copyright = jsonObject.get("copyright").toString();
} catch (JSONException e) {
    e.printStackTrace();
}

//Add apod to Apods list
Apod apod = new Apod(image_url,publish_date,title,explanation,copyright);
apod_list.add(apod);

}