我试图在运行时更改应用程序的区域设置。在API级别24以下的Andorid中,它可以正常工作。但是在API级别24或更高级别中,布局方向不会根据区域设置更改。 以下是在运行时更改区域设置的代码。我使用了如下的LocaleHelper类
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);
Log.d("LocaleHelper", "language : "+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;
}
}
以下是我在活动类中使用的代码:
public class MainActivity extends AppCompatActivity {
@BindView(R.id.titleTextView)
TextView mTitleTextView;
@BindView(R.id.descTextView)
TextView mDescTextView;
@BindView(R.id.aboutTextView)
TextView mAboutTextView;
@BindView(R.id.toTRButton)
Button mToTRButton;
@BindView(R.id.toENButton)
Button mToENButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
setTitle(getString(R.string.main_activity_toolbar_title));
}
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(LocaleHelper.onAttach(base));
}
@OnClick(R.id.toTRButton)
public void onChangeToTRClicked() {
updateViews("ur");
}
@OnClick(R.id.toENButton)
public void onChangeToENClicked() {
updateViews("en");
}
private void updateViews(String languageCode) {
Context context = LocaleHelper.setLocale(this, languageCode);
Resources resources = context.getResources();
mTitleTextView.setText(resources.getString(R.string.main_activity_title));
mDescTextView.setText(resources.getString(R.string.main_activity_desc));
mAboutTextView.setText(resources.getString(R.string.main_activity_about));
mToTRButton.setText(resources.getString(R.string.main_activity_to_tr_button));
mToENButton.setText(resources.getString(R.string.main_activity_to_en_button));
setTitle(resources.getString(R.string.main_activity_toolbar_title));
this.recreate();
}
}
在我的应用程序类中,我已添加了以下代码。
@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(LocaleHelper.onAttach(base, "en"));
}
现在当我从英语切换到乌尔都语时,语言确实改变了,但布局方向并没有按预期改变。当我再次点击乌尔都语时,布局方向就会改变(第二次尝试)。以下是参考截图。 请帮忙解决这个问题。