Refactor InternetIconInjector to SettingsLib

- Plan to share the InternetIconInjector class to System UI.

Bug: 192923176
Test: manual test
make RunSettingsLibRoboTests ROBOTEST_FILTER=WifiUtilsTest

Change-Id: Ieb7080ab6f6462abc3820b47c2a58cc2ea2a083e

packages/SettingsLib/src/com/android/settingslib/wifi/WifiUtils.java

@@ -21,6 +21,7 @@ import static android.net.wifi.WifiConfiguration.NetworkSelectionStatus.getMaxNe
 
 import android.content.Context;
 import android.content.Intent;
+import android.graphics.drawable.Drawable;
 import android.net.wifi.ScanResult;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiConfiguration.NetworkSelectionStatus;
@@ -294,6 +295,28 @@ public class WifiUtils {
         return noInternet ? NO_INTERNET_WIFI_PIE[level] : WIFI_PIE[level];
     }
 
+    /**
+     * Wrapper the {@link #getInternetIconResource} for testing compatibility.
+     */
+    public static class InternetIconInjector {
+
+        protected final Context mContext;
+
+        public InternetIconInjector(Context context) {
+            mContext = context;
+        }
+
+        /**
+         * Returns the Internet icon for a given RSSI level.
+         *
+         * @param noInternet True if a connected Wi-Fi network cannot access the Internet
+         * @param level The number of bars to show (0-4)
+         */
+        public Drawable getIcon(boolean noInternet, int level) {
+            return mContext.getDrawable(WifiUtils.getInternetIconResource(level, noInternet));
+        }
+    }
+
     public static boolean isMeteredOverridden(WifiConfiguration config) {
         return config.meteredOverride != WifiConfiguration.METERED_OVERRIDE_NONE;
     }

packages/SettingsLib/tests/robotests/src/com/android/settingslib/wifi/WifiUtilsTest.java

@@ -20,6 +20,8 @@ import static com.google.common.truth.Truth.assertThat;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import android.content.Context;
@@ -37,6 +39,8 @@ import android.os.SystemClock;
 import android.text.format.DateUtils;
 import android.util.ArraySet;
 
+import androidx.test.core.app.ApplicationProvider;
+
 import com.android.settingslib.R;
 
 import org.junit.Before;
@@ -45,7 +49,6 @@ import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.RobolectricTestRunner;
-import org.robolectric.RuntimeEnvironment;
 
 import java.util.ArrayList;
 import java.util.Set;
@@ -70,7 +73,7 @@ public class WifiUtilsTest {
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
-        mContext = RuntimeEnvironment.application;
+        mContext = spy(ApplicationProvider.getApplicationContext());
     }
 
     @Test
@@ -160,6 +163,21 @@ public class WifiUtilsTest {
         assertThat(bundle.getString(WifiUtils.KEY_CHOSEN_WIFIENTRY_KEY)).isEqualTo(key);
     }
 
+    @Test
+    public void testInternetIconInjector_getIcon_returnsCorrectValues() {
+        WifiUtils.InternetIconInjector iconInjector = new WifiUtils.InternetIconInjector(mContext);
+
+        for (int level = 0; level <= 4; level++) {
+            iconInjector.getIcon(false /* noInternet */, level);
+            verify(mContext).getDrawable(
+                    WifiUtils.getInternetIconResource(level, false /* noInternet */));
+
+            iconInjector.getIcon(true /* noInternet */, level);
+            verify(mContext).getDrawable(
+                    WifiUtils.getInternetIconResource(level, true /* noInternet */));
+        }
+    }
+
     private static ArrayList<ScanResult> buildScanResultCache() {
         ArrayList<ScanResult> scanResults = new ArrayList<>();
         for (int i = 0; i < 5; i++) {