Check wifi password length by byte, not char.

import android.provider.Settings;

import android.text.TextUtils;

import java.nio.charset.StandardCharsets;

public class WifiUtils {

    private static final int SSID_ASCII_MIN_LENGTH = 1;

        if (TextUtils.isEmpty(ssid)) {

            return false;

        }

        return ssid.length() > SSID_ASCII_MAX_LENGTH;

        return ssid.getBytes(StandardCharsets.UTF_8).length > SSID_ASCII_MAX_LENGTH;

    }

    public static boolean isSSIDTooShort(String ssid) {

    /**

     * This method is a stripped and negated version of WifiConfigStore.canModifyNetwork.

     *

     * @param context Context of caller

     * @param config  The WiFi config.

     * @return true if Settings cannot modify the config due to lockDown.

    @Test

    public void testSSID() {

        assertThat(WifiUtils.isSSIDTooLong("123")).isFalse();

        assertThat(WifiUtils.isSSIDTooLong("☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎")).isTrue();

        assertThat(WifiUtils.isSSIDTooLong("☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎")).isTrue();

        assertThat(WifiUtils.isSSIDTooShort("123")).isFalse();

        assertThat(WifiUtils.isSSIDTooShort("")).isTrue();