Show WiFi minimum level when the Wi-Fi level is UNREACHABLE

- Use WIFI_LEVEL_MIN instead of WIFI_LEVEL_UNREACHABLE to get the Wi-Fi icon resource to avoid app crashing because no valid Wi-Fi icon could be found.

Bug: 213294802
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=AddAppNetworksFragmentTest

Change-Id: Ia805e902716c25db3276b96116a84d0dd2d96a1b

src/com/android/settings/wifi/addappnetworks/AddAppNetworksFragment.java

@@ -60,6 +60,7 @@ import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.core.InstrumentedFragment;
 import com.android.settings.overlay.FeatureFactory;
+import com.android.settings.wifi.WifiUtils;
 import com.android.wifitrackerlib.WifiEntry;
 import com.android.wifitrackerlib.WifiPickerTracker;
 
@@ -419,8 +420,7 @@ public class AddAppNetworksFragment extends InstrumentedFragment implements
             return;
         }
         // TODO: Check level of the network to show signal icon.
-        final Drawable wifiIcon = mActivity.getDrawable(
-                Utils.getWifiIconResource(level)).mutate();
+        final Drawable wifiIcon = mActivity.getDrawable(getWifiIconResource(level)).mutate();
         final Drawable wifiIconDark = wifiIcon.getConstantState().newDrawable().mutate();
         wifiIconDark.setTintList(
                 Utils.getColorAttr(mActivity, android.R.attr.colorControlNormal));
@@ -566,8 +566,7 @@ public class AddAppNetworksFragment extends InstrumentedFragment implements
             final PreferenceImageView imageView = view.findViewById(android.R.id.icon);
             if (imageView != null) {
                 final Drawable drawable = getContext().getDrawable(
-                        com.android.settingslib.Utils.getWifiIconResource(
-                                uiConfigurationItem.mLevel));
+                        getWifiIconResource(uiConfigurationItem.mLevel));
                 drawable.setTintList(
                         com.android.settingslib.Utils.getColorAttr(getContext(),
                                 android.R.attr.colorControlNormal));
@@ -755,8 +754,6 @@ public class AddAppNetworksFragment extends InstrumentedFragment implements
         }
     }
 
-
-
     @VisibleForTesting
     void updateScanResultsToUi() {
         if (mUiToRequestedList == null) {
@@ -825,4 +822,9 @@ public class AddAppNetworksFragment extends InstrumentedFragment implements
     public void onNumSavedNetworksChanged() {
         // Do nothing.
     }
+
+    @VisibleForTesting
+    static int getWifiIconResource(int level) {
+        return WifiUtils.getInternetIconResource(level, false /* noInternet */);
+    }
 }

tests/robotests/src/com/android/settings/wifi/addappnetworks/AddAppNetworksFragmentTest.java

@@ -485,6 +485,11 @@ public class AddAppNetworksFragmentTest {
         assertThat(item.mDisplayedSsid).isEqualTo(FAKE_NEW_WPA_SSID);
     }
 
+    @Test
+    public void getWifiIconResource_wifiLevelIsUnreachable_shouldNotCrash() {
+        AddAppNetworksFragment.getWifiIconResource(WifiEntry.WIFI_LEVEL_UNREACHABLE);
+    }
+
     private void setUpOneScannedNetworkWithScanedLevel4() {
         final ArrayList list = new ArrayList<>();
         list.add(mWifiEntry);