How to save JSON from url and update the saved file from url after fixed interval say 5 min

问题

I want to save a JSON file from url locally in my app and also since JSON file is getting updated every minutes so i want to update my local file with updated JSON on url after fixed interval of time in backend(without affecting frontend)

回答1:

One way is to use shared preferences to store JSON string and update that as and when required.

To store data:

SharedPreferences settings = getApplicationContext().getSharedPreferences("PREF_NAME", MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString("strJSON", "" + strJSONfromServer);
editor.commit();

To retrieve data :

SharedPreferences settings = getApplicationContext().getSharedPreferences("PREF_NAME", MODE_PRIVATE);
String strData = settings.getString("strJSON", ""); 

To clear data :

SharedPreferences settings = getApplicationContext().getSharedPreferences("PREF_NAME",MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.remove("strJSON");
editor.commit();

来源：https://stackoverflow.com/questions/24772291/how-to-save-json-from-url-and-update-the-saved-file-from-url-after-fixed-interva