How to Cache Json data to be available offline?

Question

I have parsed the JSON Data in a listview and now I want to make it available offline. Is there a way to save the JSON data at the phone so that you can see th

Answer 1

How to Cache Json data to be available offline?

You can use gson to parse JSON data more easily. In your build.gradle file add this dependency.

compile 'com.google.code.gson:gson:2.8.0'

Then create a POJO class to parse JSON data.

Example POJO class:

  public class AppGeneralSettings {
    @SerializedName("key1")
String data;


    public String getData() {
        return data;
    }

}

• To parse a json string from internet use this snippet

  AppGeneralSettings data=new Gson().fromJson(jsonString, AppGeneralSettings.class);
  

Then add a helper class to store and retrieve JSON data to and from preferences.

Example: Helper class to store data

public class AppPreference {
    private static final String FILE_NAME = BuildConfig.APPLICATION_ID + ".apppreference";
    private static final String APP_GENERAL_SETTINGS = "app_general_settings";
    private final SharedPreferences preferences;

    public AppPreference(Context context) {
        preferences = context.getSharedPreferences(FILE_NAME, MODE_PRIVATE);
    }

    public SharedPreferences.Editor setGeneralSettings(AppGeneralSettings appGeneralSettings) {
        return preferences.edit().putString(APP_GENERAL_SETTINGS, new Gson().toJson(appGeneralSettings));
    }

    public AppGeneralSettings getGeneralSettings() {
        return new Gson().fromJson(preferences.getString(APP_GENERAL_SETTINGS, "{}"), AppGeneralSettings.class);
    }
}

To save data

new AppPreference().setGeneralSettings(appGeneralSettings).commit();

To retrieve data

 AppGeneralSettings appGeneralSettings = new AppPreference().getGeneralSettings();