在应用

Question

我可以将我的应用程序更改为波斯语，但每当我关闭应用程序并重新打开它时，它都会恢复为默认的英语。另一个问题是当我点击它时英语不起作用，当我点击后退按钮时，它又回到之前的活动英语

 @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_settings);
            SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
            Configuration config = getBaseContext().getResources().getConfiguration();

            final String lang = settings.getString("LANG", "");
            if (!"".equals(lang) && !config.locale.getLanguage().equals(lang)) {
                Locale locale = new Locale(lang);
                Locale.setDefault(locale);
                config.locale = locale;
                getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources()
                        .getDisplayMetrics());
            }

            Spinner spinner = (Spinner) findViewById(R.id.spinner1);
            spinner.setPrompt("select language");
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_spinner_item, languages);
            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            spinner.setAdapter(adapter);
            spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
            {
                public void onItemSelected(AdapterView<?> arg0, View arg1,
                                           int arg2 ,long arg3 ) {
                    Configuration config = new Configuration();
                    Locale locale;
                    switch (arg2) {
                        case 0:
                            config.locale = Locale.ENGLISH;
                            break;
                        case 1:
                        PreferenceManager.getDefaultSharedPreferences(getApplicationContext())
                                    .edit().putString("LANG", "fa").apply();
                            config.locale = new Locale("fa");
                            startActivity(new Intent(getBaseContext(), MainActivity.class));
                            finish();
                            break;
                    }
                    getResources().updateConfiguration(config, null);
                }

                public void onNothingSelected(AdapterView<?> arg0) {
                    // TODO Auto-generated method stub
                }
            });
        }
        private String[] languages = { "English","فارسی" };
    }