Remove Legal Information duplicate from Settings search

Bug: 33701673
Test: make RunSettingsRoboTests
Change-Id: Icee65b7a683ad80cd587e22a575b4abc4b009d8f

res/xml/about_legal.xml

@@ -15,7 +15,8 @@
 -->
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
-                  android:title="@string/legal_information">
+                  android:title="@string/legal_information"
+                  android:key="legal_screen">
 
     <!-- Note: The titles given here probably won't be used.  Instead, we programmatically
        fill the title with the label of the activity with the corresponding action.

src/com/android/settings/DeviceInfoSettings.java

@@ -51,6 +51,8 @@ public class DeviceInfoSettings extends DashboardFragment implements Indexable {
 
     private static final String LOG_TAG = "DeviceInfoSettings";
 
+    private static final String KEY_LEGAL_CONTAINER = "legal_container";
+
     @Override
     public int getMetricsCategory() {
         return MetricsEvent.DEVICEINFO;
@@ -151,5 +153,12 @@ public class DeviceInfoSettings extends DashboardFragment implements Indexable {
                     return buildPreferenceControllers(context, null /*activity */,
                             null /* fragment */, null /* lifecycle */);
                 }
+
+                @Override
+                public List<String> getNonIndexableKeys(Context context) {
+                    List<String> keys = super.getNonIndexableKeys(context);
+                    keys.add(KEY_LEGAL_CONTAINER);
+                    return keys;
+                }
             };
 }

tests/robotests/src/com/android/settings/DeviceInfoSettingsTest.java

@@ -28,6 +28,8 @@ import android.os.UserManager;
 import android.support.v7.preference.PreferenceScreen;
 
 import com.android.settings.dashboard.SummaryLoader;
+import com.android.settings.testutils.XmlTestUtils;
+import com.android.settings.testutils.shadow.ShadowUtils;
 import com.android.settingslib.DeviceInfoUtils;
 
 import org.junit.Before;
@@ -36,8 +38,11 @@ import org.junit.runner.RunWith;
 import org.mockito.Answers;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 
+import java.util.List;
+
 @RunWith(SettingsRobolectricTestRunner.class)
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
 public class DeviceInfoSettingsTest {
@@ -75,4 +80,17 @@ public class DeviceInfoSettingsTest {
 
         verify(mSummaryLoader).setSummary(mProvider, Build.MODEL + DeviceInfoUtils.getMsvSuffix());
     }
+
+    @Test
+    @Config(shadows = ShadowUtils.class)
+    public void testNonIndexableKeys_existInXmlLayout() {
+        final Context context = RuntimeEnvironment.application;
+        final List<String> niks = DeviceInfoSettings.SEARCH_INDEX_DATA_PROVIDER
+                .getNonIndexableKeys(context);
+        final int xmlId = (new DeviceInfoSettings()).getPreferenceScreenResId();
+
+        final List<String> keys = XmlTestUtils.getKeysFromPreferenceXml(context, xmlId);
+
+        assertThat(keys).containsAllIn(niks);
+    }
 }

tests/robotests/src/com/android/settings/testutils/shadow/ShadowUtils.java

@@ -46,4 +46,9 @@ public class ShadowUtils {
     public static void reset() {
         sFingerprintManager = null;
     }
+
+    @Implementation
+    public static boolean isWifiOnly(Context context) {
+        return true;
+    }
 }