[Mac Randomization] Fix MAC randomization option does not work when

ephemeral newtork

WifiConfiguration is only available when saved network. So ephemeral
newtork could not have wifi config to config wifi setting. In this
situation, making option be not selectable.

Bug: 122919564
Test: atest WifiPrivacyPreferenceControllerTest
Change-Id: I8a2a1c36ec6d41a6f912da29a8b17bc2e43d9a27

res/values/strings.xml

@@ -2102,6 +2102,8 @@
     <string name="wifi_ip_settings">IP settings</string>
     <!-- Label for the spinner to show Wifi MAC randomization [CHAR LIMIT=25] -->
     <string name="wifi_privacy_settings">Privacy</string>
+    <!-- Summary for Wifi MAC randomization option when it is ephemeral network [CHAR LIMIT=25] -->
+    <string name="wifi_privacy_settings_ephemeral_summary">Randomized MAC</string>
     <!-- Title for the fragment to add a device into the wifi network [CHAR LIMIT=50]  -->
     <string name="wifi_dpp_add_device_to_network">Add a device</string>
     <!-- Hint for the user to center another device's QR code in the below camera window [CHAR LIMIT=120] -->

src/com/android/settings/wifi/details/WifiNetworkDetailsFragment.java

@@ -141,6 +141,7 @@ public class WifiNetworkDetailsFragment extends DashboardFragment {
         WifiPrivacyPreferenceController preferenceController = new WifiPrivacyPreferenceController(
                 context);
         preferenceController.setWifiConfiguration(mAccessPoint.getConfig());
+        preferenceController.setIsEphemeral(mAccessPoint.isEphemeral());
         controllers.add(preferenceController);
 
         return controllers;

src/com/android/settings/wifi/details/WifiPrivacyPreferenceController.java

@@ -25,6 +25,7 @@ import androidx.annotation.VisibleForTesting;
 import androidx.preference.DropDownPreference;
 import androidx.preference.Preference;
 
+import com.android.settings.R;
 import com.android.settings.core.BasePreferenceController;
 import com.android.settings.core.FeatureFlags;
 import com.android.settingslib.core.AbstractPreferenceController;
@@ -39,6 +40,7 @@ public class WifiPrivacyPreferenceController extends BasePreferenceController im
     private static final String KEY_WIFI_PRIVACY = "privacy";
     private WifiConfiguration mWifiConfiguration;
     private WifiManager mWifiManager;
+    private boolean mIsEphemeral = false;
 
     public WifiPrivacyPreferenceController(Context context) {
         super(context, KEY_WIFI_PRIVACY);
@@ -50,6 +52,10 @@ public class WifiPrivacyPreferenceController extends BasePreferenceController im
         mWifiConfiguration = wifiConfiguration;
     }
 
+    public void setIsEphemeral(boolean isEphemeral) {
+        mIsEphemeral = isEphemeral;
+    }
+
     @Override
     public int getAvailabilityStatus() {
         return FeatureFlagUtils.isEnabled(mContext, FeatureFlags.WIFI_MAC_RANDOMIZATION)
@@ -62,6 +68,12 @@ public class WifiPrivacyPreferenceController extends BasePreferenceController im
         final int randomizationLevel = getRandomizationValue();
         dropDownPreference.setValue(Integer.toString(randomizationLevel));
         updateSummary(dropDownPreference, randomizationLevel);
+
+        // Makes preference not selectable, when this is a ephemeral network.
+        if (mIsEphemeral) {
+            preference.setSelectable(false);
+            dropDownPreference.setSummary(R.string.wifi_privacy_settings_ephemeral_summary);
+        }
     }
 
     @Override

tests/robotests/src/com/android/settings/wifi/details/WifiPrivacyPreferenceControllerTest.java

@@ -93,4 +93,20 @@ public class WifiPrivacyPreferenceControllerTest {
         mPreferenceController.getRandomizationValue();
         mPreferenceController.onPreferenceChange(mDropDownPreference, "1");
     }
+
+    @Test
+    public void testUpdateState_isNotEphemeralNetwork_shouldBeSelectable() {
+        mPreferenceController.setIsEphemeral(false);
+        mPreferenceController.updateState(mDropDownPreference);
+
+        assertThat(mDropDownPreference.isSelectable()).isTrue();
+    }
+
+    @Test
+    public void testUpdateState_isEphemeralNetwork_shouldNotSelectable() {
+        mPreferenceController.setIsEphemeral(true);
+        mPreferenceController.updateState(mDropDownPreference);
+
+        assertThat(mDropDownPreference.isSelectable()).isFalse();
+    }
 }