我的解是这样的

@SuppressWarnings("deprecation")
public String getCurrentLocale2() {
    return Resources.getSystem().getConfiguration().locale.getLanguage();
}

@TargetApi(Build.VERSION_CODES.N)
public Locale getCurrentLocale() {
    getResources();
    return Resources.getSystem().getConfiguration().getLocales().get(0);
}

然后

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                Log.e("Locale", getCurrentLocale().getLanguage());
            } else {
                Log.e("Locale", getCurrentLocale2().toString());
            }

显示——>和

如果你选择了一种不会打字的语言，那么希腊文可能会有帮助。

getDisplayLanguage().toString() = English
getLanguage().toString() = en 
getISO3Language().toString() = eng
getDisplayLanguage()) = English
getLanguage() = en
getISO3Language() = eng

现在试试用希腊语

getDisplayLanguage().toString() = Ελληνικά
getLanguage().toString() = el
getISO3Language().toString() = ell
getDisplayLanguage()) = Ελληνικά
getLanguage() = el
getISO3Language() = ell

public class LocalUtils {

    private static final String LANGUAGE_CODE_ENGLISH = "en";


    // returns application language eg: en || fa ...
    public static String getAppLanguage() {
        return Locale.getDefault().getLanguage();
    }

    // returns device language eg: en || fa ...
    public static String getDeviceLanguage() {
        return ConfigurationCompat.getLocales(Resources.getSystem().getConfiguration()).get(0).getLanguage();
    }

    public static boolean isDeviceEnglish() {
        return getDeviceLanguage().equals(new Locale(LANGUAGE_CODE_ENGLISH).getLanguage());
    }

    public static boolean isAppEnglish() {
        return getAppLanguage().equals(new Locale(LANGUAGE_CODE_ENGLISH).getLanguage());
    }


}

Log.i("AppLanguage: ",     LocalUtils.getAppLanguage());
Log.i("DeviceLanguage: ",  LocalUtils.getDeviceLanguage());
Log.i("isDeviceEnglish: ", String.valueOf(LocalUtils.isDeviceEnglish()));
Log.i("isAppEnglish: ",    String.valueOf(LocalUtils.isAppEnglish()));

如果你想检查当前语言，请使用@Sarpe (@Thorbear)的答案:

val language = ConfigurationCompat.getLocales(Resources.getSystem().configuration)?.get(0)?.language
// Check here the language.
val format = if (language == "ru") "d MMMM yyyy г." else "d MMMM yyyy"
val longDateFormat = SimpleDateFormat(format, Locale.getDefault())

基本的Kotlin答案:

Locale.getDefault().language

再加上约翰·佩尔格里姆的回答

context.getResources().getConfiguration().locale
Locale.getDefault()

是等价的，因为android.text.format.DateFormat类可以互换使用这两者。

private static String zeroPad(int inValue, int inMinDigits) {
    return String.format(Locale.getDefault(), "%0" + inMinDigits + "d", inValue);
}

and

public static boolean is24HourFormat(Context context) {
    String value = Settings.System.getString(context.getContentResolver(),
            Settings.System.TIME_12_24);

    if (value == null) {
        Locale locale = context.getResources().getConfiguration().locale;

    // ... snip the rest ...
}