Refresh Activity from ViewPager Fragment

Question

I have a BaseActivity which has a ViewPager with some Fragments in it. In one of these Fragments I have 2 buttons which change the language of the app. The thing I want to accomplish is that, on the click of the button, refresh BaseActivity to the selected language but still have the ViewPager set on Settings(name of the fragment). Right now it's reloading the entire app and starts on the fragment which I set it to start on.

Code for changing the language and refreshing the Activity

 public void setLocale(String lang) {
        Locale myLocale = new Locale(lang);
        Resources res = getResources();
        DisplayMetrics dm = res.getDisplayMetrics();
        Configuration conf = res.getConfiguration();
        conf.locale = myLocale;
        res.updateConfiguration(conf, dm);
        SharedPreferences ensharedPreferences = getActivity().getSharedPreferences("selectedLanguage", MODE_PRIVATE);
        SharedPreferences.Editor eneditor = ensharedPreferences.edit();
        eneditor.putString("language", lang);
        eneditor.apply();
        SharedPreferences pref = getActivity().getSharedPreferences(lang,MODE_PRIVATE);
        Intent refresh = new Intent(getContext(), BaseActivity.class);
        getActivity().overridePendingTransition(0,0);
        startActivity(refresh);
        getActivity().overridePendingTransition(0,0);
    }

I have only found methods on doing this the reverse way, to reload a fragment from the activity, but I want to do it the other way.

https://stackoverflow.com/questions/12659747/call-an-activity-method-from-a-fragment — iMDroid, Aug 10 '17 at 10:22
@iMDroid I can't really find the solution to my problem in that thread. I have no need of calling a method from my Activity. I have to restart the activity to change the language(which is implemented), but I don't want it to change the current state. — Viktor, Aug 10 '17 at 10:33

score 2 · Accepted Answer · answered Aug 10 '17 at 10:48

You can pass the ViewPager's selected position to the Activity using getCurrentItem() and pass it to the new Intent as an extra and reselect the item number when relaunching the Activity through getIntent() and move to the previously selected Fragment by using setCurrentItem(int position)

// Restarting the Activity passing the position of the currently selected Fragment
Intent intent = new Intent(getContext(), BaseActivity.class);
intent.putExtra(EXTRA_POSITION, viewPager.getCurrentItem());
startActivity(intent);

@Override
protected void onCreate(Bundle savedInstanceState) {
   ...
   Intent intent = getIntent();
   if(intent != null) {
      int position = intent.getIntExtra(EXTRA_POSITION, 0);
      viewPager.setCurrentItem(position);
   }
}

This worked perfectly! Easy and clean solution, thanks! – Viktor Aug 10 '17 at 12:43 — Viktor, Aug 10 '17 at 12:43

Refresh Activity from ViewPager Fragment

1 Answers1