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Change app language programmatically in Android

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面向向阳花
面向向阳花 2020-11-21 04:34

Is it possible to change the language of an app programmatically while still using Android resources?

If not, is it possible to request a resource in an specific lan

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30条回答
  • 忘了有多久
    2020-11-21 05:07

    According to this article. You will need to download LocaleHelper.java referenced in that article.

    1. Create MyApplication class that will extends Application
    2. Override attachBaseContext() to update language.

    3. Register this class in manifest. 

      public class MyApplication extends Application {
   @Override
   protected void attachBaseContext(Context base) {
    super.attachBaseContext(LocaleHelper.onAttach(base, "en"));
   }
}

<application
     android:name="com.package.MyApplication"
     .../>

    4. Create BaseActivity and override onAttach() to update language. Needed for Android 6+ 

      public class BaseActivity extends Activity {
  @Override
  protected void attachBaseContext(Context base) {
    super.attachBaseContext(LocaleHelper.onAttach(base));
  }
}

    5. Make all activities on your app extends from BaseActivity.

      public class LocaleHelper {

private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";

public static Context onAttach(Context context) {
    String lang = getPersistedData(context, Locale.getDefault().getLanguage());
    return setLocale(context, lang);
}

public static Context onAttach(Context context, String defaultLanguage) {
    String lang = getPersistedData(context, defaultLanguage);
    return setLocale(context, lang);
}

public static String getLanguage(Context context) {
    return getPersistedData(context, Locale.getDefault().getLanguage());
}

public static Context setLocale(Context context, String language) {
    persist(context, language);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        return updateResources(context, language);
    }

    return updateResourcesLegacy(context, language);
}

private static String getPersistedData(Context context, String defaultLanguage) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);
}

private static void persist(Context context, String language) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = preferences.edit();

    editor.putString(SELECTED_LANGUAGE, language);
    editor.apply();
}

@TargetApi(Build.VERSION_CODES.N)
private static Context updateResources(Context context, String language) {
    Locale locale = new Locale(language);
    Locale.setDefault(locale);

    Configuration configuration = context.getResources().getConfiguration();
    configuration.setLocale(locale);
    configuration.setLayoutDirection(locale);

    return context.createConfigurationContext(configuration);
}

@SuppressWarnings("deprecation")
private static Context updateResourcesLegacy(Context context, String language) {
    Locale locale = new Locale(language);
    Locale.setDefault(locale);

    Resources resources = context.getResources();

    Configuration configuration = resources.getConfiguration();
    configuration.locale = locale;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        configuration.setLayoutDirection(locale);
    }

    resources.updateConfiguration(configuration, resources.getDisplayMetrics());

    return context;
}
}
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  • Happy的楠姐
    2020-11-21 05:07

    For Android 7.0 Nougat (and lower) follow this article:

    Change Language Programatically in Android

    Old answer
    This include RTL/LTR support:

    public static void changeLocale(Context context, Locale locale) {
    Configuration conf = context.getResources().getConfiguration();
    conf.locale = locale;
    Locale.setDefault(locale);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
       conf.setLayoutDirection(conf.locale);
    }

    context.getResources().updateConfiguration(conf, context.getResources().getDisplayMetrics());
}
    0 讨论(0)
  • 广开言路
    2020-11-21 05:07

    Add LocaleHelper class

    public class LocaleHelper{ 
private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";
public static Context onAttach(Context context) {
    String lang = getPersistedData(context, Locale.getDefault().getLanguage());
    return setLocale(context, lang);
}

public static Context onAttach(Context context, String defaultLanguage) {
    String lang = getPersistedData(context, defaultLanguage);
    return setLocale(context, lang);
}

public static String getLanguage(Context context) {
    return getPersistedData(context, Locale.getDefault().getLanguage());
}
public static Context setLocale(Context context, String language) {
    persist(context, language);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        return updateResources(context, language);
    }

    return updateResourcesLegacy(context, language);
}

private static String getPersistedData(Context context, String defaultLanguage) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);
}

private static void persist(Context context, String language) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = preferences.edit();

    editor.putString(SELECTED_LANGUAGE, language);
    editor.apply();
}

@TargetApi(Build.VERSION_CODES.N)
private static Context updateResources(Context context, String language) {
    Locale locale = new Locale(language);
    Locale.setDefault(locale);

    Configuration configuration = context.getResources().getConfiguration();
    configuration.setLocale(locale);
    configuration.setLayoutDirection(locale);

    return context.createConfigurationContext(configuration);
}

@SuppressWarnings("deprecation")
private static Context updateResourcesLegacy(Context context, String language) {
    Locale locale = new Locale(language);
    Locale.setDefault(locale);

    Resources resources = context.getResources();

    Configuration configuration = resources.getConfiguration();
    configuration.locale = locale;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        configuration.setLayoutDirection(locale);
    }

    resources.updateConfiguration(configuration, resources.getDisplayMetrics());

    return context;
}
}

    In Activity or Fragment

    Context context = LocaleHelper.setLocale(this, App.getSharedPre().getLanguage());
Resource resources = context.getResources();

    Now SetText on every text

    TextView tv = findViewById(R.id.tv);
tv.setText(resources.getString(R.string.tv));
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  • 渐次进展
    2020-11-21 05:08

    I was facing the same issue. On GitHub I found the Android-LocalizationActivity library.

    This library makes it very simple to change the language of your app at runtime, as you can see in the code sample below. A sample project including the sample code below and more information can be found at the github page.

    The LocalizationActivity extends AppCompatActivity, so you can also use it when you are using Fragments.

    public class MainActivity extends LocalizationActivity implements View.OnClickListener {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_simple);

        findViewById(R.id.btn_th).setOnClickListener(this);
        findViewById(R.id.btn_en).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        int id = v.getId();
        if (id == R.id.btn_en) {
            setLanguage("en");
        } else if (id == R.id.btn_th) {
            setLanguage("th");
        }
    }
}
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  • 长情又很酷
    2020-11-21 05:08

    At first create multi string.xml for different languages; then use this block of code in onCreate() method:

    super.onCreate(savedInstanceState);
String languageToLoad  = "fr"; // change your language here
Locale locale = new Locale(languageToLoad); 
Locale.setDefault(locale);
Configuration config = new Configuration();
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config, 
  getBaseContext().getResources().getDisplayMetrics());
this.setContentView(R.layout.main);
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  • 青春惊慌失措
    2020-11-21 05:08

    Alex Volovoy answer only works for me if it's in onCreate method of the activity.

    The answer that works in all the methods is in another thread

    Change language programmatically in Android

    Here is the adaptation of the code

    

    Resources standardResources = getBaseContext().getResources();

    AssetManager assets = standardResources.getAssets();

    DisplayMetrics metrics = standardResources.getDisplayMetrics();

    Configuration config = new Configuration(standardResources.getConfiguration());

    config.locale = new Locale(languageToLoad);

    Resources defaultResources = new Resources(assets, metrics, config);

    Hope that it helps.

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