Check wifi password length by byte, not char.

Change-Id: Ie6dc441780660c52ff01a2bced79a4e95200d731
Fixes: 79209073
Test: robotest

src/com/android/settings/wifi/WifiUtils.java

@@ -26,6 +26,8 @@ import android.net.wifi.WifiConfiguration;
 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;
@@ -38,7 +40,7 @@ public class WifiUtils {
         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) {
@@ -59,6 +61,7 @@ public class WifiUtils {
 
     /**
      * 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.

tests/robotests/src/com/android/settings/wifi/WifiUtilsTest.java

@@ -29,7 +29,7 @@ public class WifiUtilsTest {
     @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();