Question

我正在我的Android应用程序中添加多种语言功能。每当我更改语言时，它都会改变。但是在重新打开应用程序后，它再次显示选择语言屏幕。我想保存上次选择的语言，因此下次用户重新打开应用程序时，它不应显示选择语言屏幕，而应直接转到下一页，并以上次选择的语言显示项目。该怎么办？有什么办法吗？请检查以下代码。在这段代码中，我必须将其存储在SharedPreferences中，并且必须在其中获取sharedpreference

public class lang extends AppCompatActivity {

    Spinner spinner;
    Locale myLocale;
    String currentLanguage = "en", currentLang;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_lang);

        currentLanguage = getIntent().getStringExtra(currentLang);

        spinner = (Spinner) findViewById(R.id.spinner);

        List<String> list = new ArrayList<String>();

        list.add("Select language");
        list.add("English");
        list.add("Español");
        list.add("Français");
        list.add("Hindi");

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int position, long l) {
                switch (position) {
                    case 0:
                        break;
                    case 1:
                        setLocale("en");
                        break;
                    case 2:
                        setLocale("es");
                        break;
                    case 3:
                        setLocale("fr");
                        break;
                    case 4:
                        setLocale("hi");
                        break;
                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {
            }
        });
    }

    public void setLocale(String localeName) {
        if (!localeName.equals(currentLanguage)) {
            myLocale = new Locale(localeName);
            Resources res = getResources();
            DisplayMetrics dm = res.getDisplayMetrics();
            Configuration conf = res.getConfiguration();
            conf.locale = myLocale;
            res.updateConfiguration(conf, dm);
            Intent refresh = new Intent(this, MainActivity.class);
            refresh.putExtra(currentLang, localeName);
            startActivity(refresh);
        } else {
            Toast.makeText(lang.this, "Language already selected!", Toast.LENGTH_SHORT).show();
        }
    }



    public void onBackPressed() {
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_HOME);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(intent);
        finish();
        System.exit(0);
    }
}

Answer 1

您必须创建一个AppPreference类，并将数据保存在Shared Preference中，如下所示：-

public class AppPrefrences {

            private static SharedPreferences mPrefs;
            private static SharedPreferences.Editor mPrefsEditor;


    public static String getSelectdLanguage(Context ctx) {
            mPrefs = PreferenceManager.getDefaultSharedPreferences(ctx);
            return mPrefs.getString("language", "");
        }

        public static void setSelectdLanguage(Context ctx, String value) {
            mPrefs = PreferenceManager.getDefaultSharedPreferences(ctx);
            mPrefsEditor = mPrefs.edit();
            mPrefsEditor.putString("language", value);
            mPrefsEditor.commit();
        }

public static void clearAllPreferences(Context ctx) {
        mPrefs = PreferenceManager.getDefaultSharedPreferences(ctx);
        mPrefsEditor = mPrefs.edit();
        mPrefsEditor.clear();
        mPrefsEditor.commit();
    }
        }

要保存您选择的语言，请调用此方法：-

AppPreference.setSelectdLanguage(this, "selected language");

并从共享首选项中进行选择：-

String selectdLanguage = AppPreference.getSelectedLanguage(this);

如何使用sharedpreference保存最后选择的语言？

1 个答案: