android.content.res.Configuration#setLayoutDirection()源码实例Demo

@SuppressLint("ObsoleteSdkInt")
@SuppressWarnings("deprecation")
private static Context updateResourcesLegacy(Context context, Locale locale) {
    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;
}
 

/**
 * This is public to allow for an activity to force the
 * current locale to be applied if necessary (e.g., when
 * a new activity launches).
 */
public void updateConfiguration(Context context, Locale locale) {
    Resources res = context.getResources();
    Configuration config = res.getConfiguration();

    // We should use setLocale, but it's unexpectedly missing
    // on real devices.
    config.locale = locale;

    config.setLayoutDirection(locale);

    res.updateConfiguration(config, null);
}
 

private void updateLocale(@NonNull Context context, @NonNull Locale locale) {
    final Resources resources = context.getResources();
    Configuration config = resources.getConfiguration();
    config.locale = locale;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        config.setLayoutDirection(config.locale);
    }
    resources.updateConfiguration(config, resources.getDisplayMetrics());
}
 

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

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

    return context.createConfigurationContext(configuration);
}
 

public static void checkLanguage(Context context) {
    Resources resources = context.getResources();
    DisplayMetrics dm = resources.getDisplayMetrics();
    Configuration config = resources.getConfiguration();

    config.locale = getLocal(context);

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

    resources.updateConfiguration(config, dm);
}
 

/**
 * This is public to allow for an activity to force the
 * current locale to be applied if necessary (e.g., when
 * a new activity launches).
 */
public void updateConfiguration(Context context, Locale locale) {
    Resources res = context.getResources();
    Configuration config = res.getConfiguration();

    // We should use setLocale, but it's unexpectedly missing
    // on real devices.
    config.locale = locale;

    config.setLayoutDirection(locale);

    res.updateConfiguration(config, null);
}
 

@SuppressLint("NewApi")
private void setConfigurationLocale(Configuration config, Locale loc) {
    config.locale = loc;

    if (Build.VERSION.SDK_INT >= 17) {
        // Don't use setLocale() in order not to trigger userSetLocale
        config.setLayoutDirection(loc);
    }
}
 

@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;
    configuration.setLayoutDirection(locale);

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

    return context;
}
 

/**
 *
 * @param context
 * @return true if the application locale changed
 */
static boolean setAppLocale(Context context, Locale newLocale)    {

    Resources resources = context.getResources();
    DisplayMetrics displayMetrics = resources.getDisplayMetrics();
    Configuration configuration = resources.getConfiguration();

    Locale oldLocale = new Locale(configuration.locale.getLanguage(), configuration.locale.getCountry());
    configuration.locale = newLocale;
    // Sets the layout direction from the Locale
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        sLogger.debug("Setting the layout direction");
        configuration.setLayoutDirection(newLocale);
    }
    resources.updateConfiguration(configuration, displayMetrics);

    if(oldLocale.equals(newLocale)) {
        return false;
    }

    if (LocalesUtils.updatePreferredLocale(newLocale))    {
        sLogger.info("Locale preferences updated to: " + newLocale);
        Locale.setDefault(newLocale);
    } else  {
        sLogger.error("Failed to update locale preferences.");
    }

    return true;
}
 

public static void setContextLocale(Context context, Locale selectedLocale) {
  Configuration configuration = context.getResources().getConfiguration();

  if (!configuration.locale.equals(selectedLocale)) {
    configuration.locale = selectedLocale;
    if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR1) {
      configuration.setLayoutDirection(selectedLocale);
    }
    context.getResources().updateConfiguration(configuration,
                                               context.getResources().getDisplayMetrics());
  }
}
 

private static void setContextLocale(Context context, Locale selectedLocale) {
  Configuration configuration = context.getResources().getConfiguration();

  if (!configuration.locale.equals(selectedLocale)) {
    configuration.locale = selectedLocale;
    if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR1) {
      configuration.setLayoutDirection(selectedLocale);
    }
    context.getResources().updateConfiguration(configuration,
                                               context.getResources().getDisplayMetrics());
  }
}
 

private void setLocaleWith(Locale locale) throws
        ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException, NoSuchFieldException {
    Class<?> activityManagerNativeClass = Class.forName("android.app.ActivityManagerNative");

    Method methodGetDefault = activityManagerNativeClass.getMethod("getDefault");
    methodGetDefault.setAccessible(true);
    Object amn = methodGetDefault.invoke(activityManagerNativeClass);

    // Build.VERSION_CODES.O
    if (Build.VERSION.SDK_INT >= 26) {
        // getConfiguration moved from ActivityManagerNative to ActivityManagerProxy
        activityManagerNativeClass = Class.forName(amn.getClass().getName());
    }

    Method methodGetConfiguration = activityManagerNativeClass.getMethod("getConfiguration");
    methodGetConfiguration.setAccessible(true);
    Configuration config = (Configuration) methodGetConfiguration.invoke(amn);

    Class<?> configClass = config.getClass();
    Field f = configClass.getField("userSetLocale");
    f.setBoolean(config, true);

    config.locale = locale;
    config.setLayoutDirection(locale);

    Method methodUpdateConfiguration = activityManagerNativeClass.getMethod("updateConfiguration", Configuration.class);
    methodUpdateConfiguration.setAccessible(true);
    methodUpdateConfiguration.invoke(amn, config);
}
 

public static Context setLocale(Context context, String locale) {
    setPreferredLocale(context, locale);

    Locale newLocale = (locale.isEmpty()) ? SYSTEM_DEFAULT_LOCALE : Locale.forLanguageTag(locale);
    Configuration configuration = context.getResources().getConfiguration();

    Locale.setDefault(newLocale);

    configuration.setLocale(newLocale);
    configuration.setLayoutDirection(newLocale);

    return context.createConfigurationContext(configuration);
}