How to make a normal one-time restart of the activity without looping the program when changing the android locale?

Question

Android

In my application, I am trying to change the runtime language, that is, in the process of working. I already asked a question, but no one answered it, so I continued to further deal with this question on my own.
The task is extremely clear to make the application fully support several languages: in order to re-create the activity with a new language on the fly, and then the selected language is saved in the application settings, and this saved language is used on subsequent launches.
What I have done so far:

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == 1 && resultCode == Activity.RESULT_OK) {
            String countryCode = data.getStringExtra(CountrycodeActivity.RESULT_CONTRYCODE);
            String lang = "en";
            switch (countryCode) {
                case "English":
                    lang = "en";
                    break;
                case "Deutsch":

                    break;
                case "Русский":
                    lang = "ru";
                    break;
                case "Español":

                    break;


            }
            Toast.makeText(this, "Your native language is:" + countryCode, Toast.LENGTH_LONG).show();
            changeLang(lang);
        }
    }

    private void changeLang(String lang) {
        if (lang.equalsIgnoreCase(""))
            return;
        Locale myLocale = new Locale(lang);
        saveLocale(lang);
        Locale.setDefault(myLocale);
        android.content.res.Configuration config = new android.content.res.Configuration();
        config.locale = myLocale;
        getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
        Intent intent = new Intent(this, LoginActivity.class);
        startActivity(intent);
        finish();
        overridePendingTransition(0, 0);
    }

    private void saveLocale(String lang) {
        String langPref = "Language";
        SharedPreferences prefs = getSharedPreferences("def_loc", 0);
        SharedPreferences.Editor editor = prefs.edit();
        editor.putString(langPref, lang);
        editor.apply();
    }

from the above code, you can understand that I have a list of languages ​​\u200b\u200bthat I need. By clicking on the desired language, I automatically re-create the activity with the new language. I checked everything is OK, that is, we select the desired language and then activate it with the required language. Then I try to save the language I need so that later, even if the application was closed (not minimized), I could have a pre-selected language at startup. Here's what I threw into the onStart () function to activate immediately at the start of the network language:

@Override
    protected void onStart() {
        sp = getSharedPreferences("def_loc", 0);
        String strLocal = sp.getString("def_loc", "en");
        changeLang(strLocal);
        super.onStart();
    }

but after launching the activity, I have a loop, that is, the onStart () function is constantly launched and then the method for changing the language. I can't figure out how to call the method in a normal way so that there is no looping, and so that after restarting the program I have the language that was selected during the previous session. I hope for your help.

Answer 1

Of course there will be looping. In the changeLang() method, you launch an activity. It turns out that after the launch of the activity, it launches another one and so on ad infinitum.

Answer 2

You run the changeLang(strLocal) method in onStart() , which, regardless of whether the required locale is the requested one, restarts the activity. You have an endless loop.
Add a branch to changeLang(String) if with a check for the current locale, if it matches the requested one - just exit the method.