Load/save android sharedPref

//load the setting
var sharedPref = ctx.getPreferences(ctx.MODE_PRIVATE);
var loadedSetting = sharedPref.getString("keyNameYouWantToUse", null);
if(loadedSetting != null && loadedSetting != undefined) {
    chTiTime = loadedSetting;
}

//save the setting
var sharedPref = ctx.getPreferences(ctx.MODE_PRIVATE);
var editor = sharedPref.edit();
editor.putString("keyNameYouWantToUse", chTiTime.toString());
editor.commit();