Display "MAC address is randomized" in Wifi Preference Page

When Connected MAC Randomization is enabled and the device is
disconnected, there isn't a valid MAC address to display since we don't
know what the device's next MAC address is going to be.

Instead of displaying the MAC address used for previous connection, tell
users that "MAC address is randomized."

Bug: 73663275
Test: make -j40 RunSettingsRoboTests
Change-Id: Id5352926f221e3215734d1c198f2072940f82695

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

@@ -22,6 +22,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
+import android.provider.Settings;
 import android.support.v4.text.BidiFormatter;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceScreen;
@@ -96,10 +97,18 @@ public class WifiInfoPreferenceController extends AbstractPreferenceController
     public void updateWifiInfo() {
         if (mWifiMacAddressPref != null) {
             final WifiInfo wifiInfo = mWifiManager.getConnectionInfo();
+            final int macRandomizationMode = Settings.Global.getInt(mContext.getContentResolver(),
+                    Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, 0);
             final String macAddress = wifiInfo == null ? null : wifiInfo.getMacAddress();
-            mWifiMacAddressPref.setSummary(!TextUtils.isEmpty(macAddress)
+
-                    ? macAddress
+            if (TextUtils.isEmpty(macAddress)) {
-                    : mContext.getString(R.string.status_unavailable));
+                mWifiMacAddressPref.setSummary(R.string.status_unavailable);
+            } else if (macRandomizationMode == 1
+                    && WifiInfo.DEFAULT_MAC_ADDRESS.equals(macAddress)) {
+                mWifiMacAddressPref.setSummary(R.string.wifi_status_mac_randomized);
+            } else {
+                mWifiMacAddressPref.setSummary(macAddress);
+            }
         }
         if (mWifiIpAddressPref != null) {
             final String ipAddress = Utils.getWifiIpAddresses(mContext);

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

@@ -28,10 +28,13 @@ import android.arch.lifecycle.LifecycleOwner;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.IntentFilter;
+import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
+import android.provider.Settings;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceScreen;
 
+import com.android.settings.R;
 import com.android.settings.testutils.SettingsRobolectricTestRunner;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 
@@ -55,11 +58,15 @@ public class WifiInfoPreferenceControllerTest {
     private Preference mIpPreference;
     @Mock
     private Preference mMacPreference;
+    @Mock
+    private WifiInfo mWifiInfo;
 
     private Lifecycle mLifecycle;
     private LifecycleOwner mLifecycleOwner;
     private WifiInfoPreferenceController mController;
 
+    private static final String TEST_MAC_ADDRESS = "42:0a:23:43:ac:02";
+
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
@@ -70,6 +77,7 @@ public class WifiInfoPreferenceControllerTest {
         when(mScreen.findPreference(anyString()))
                 .thenReturn(mMacPreference)
                 .thenReturn(mIpPreference);
+        when(mWifiManager.getConnectionInfo()).thenReturn(mWifiInfo);
         mController = new WifiInfoPreferenceController(mContext, mLifecycle, mWifiManager);
     }
 
@@ -95,11 +103,32 @@ public class WifiInfoPreferenceControllerTest {
     @Test
     public void onResume_shouldUpdateWifiInfo() {
         when(mWifiManager.getCurrentNetwork()).thenReturn(null);
+        when(mWifiInfo.getMacAddress()).thenReturn(TEST_MAC_ADDRESS);
 
         mController.displayPreference(mScreen);
         mController.onResume();
 
-        verify(mMacPreference).setSummary(any());
+        verify(mMacPreference).setSummary(TEST_MAC_ADDRESS);
         verify(mIpPreference).setSummary(any());
     }
+
+    @Test
+    public void testUpdateMacAddress() {
+        when(mWifiManager.getCurrentNetwork()).thenReturn(null);
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, 1);
+        mController.displayPreference(mScreen);
+
+        when(mWifiInfo.getMacAddress()).thenReturn(null);
+        mController.updateWifiInfo();
+        verify(mMacPreference).setSummary(R.string.status_unavailable);
+
+        when(mWifiInfo.getMacAddress()).thenReturn(WifiInfo.DEFAULT_MAC_ADDRESS);
+        mController.updateWifiInfo();
+        verify(mMacPreference).setSummary(R.string.wifi_status_mac_randomized);
+
+        when(mWifiInfo.getMacAddress()).thenReturn(TEST_MAC_ADDRESS);
+        mController.updateWifiInfo();
+        verify(mMacPreference).setSummary(TEST_MAC_ADDRESS);
+    }
 }