Add ability to show/hide default_home preference.

This adds a new boolean flag, config_show_default_home, which when set
to false will hide the default_home preference item.

Bug: 62378256
Test: make RunSettingsRoboTests
ROBOTEST_FILTER=DefaultHomePreferenceControllerTest

Change-Id: Ibbf17ebb76b61fc8b2eac84016e3d874ca15a513

res/values/bools.xml

@@ -54,4 +54,7 @@
 
     <!-- Whether wallpaper attribution should be shown or not. -->
     <bool name="config_show_wallpaper_attribution">true</bool>
+
+    <!-- Whether default_home should be shown or not. -->
+    <bool name="config_show_default_home">true</bool>
 </resources>

src/com/android/settings/applications/defaultapps/DefaultHomePreferenceController.java

@@ -24,6 +24,7 @@ import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 
+import com.android.settings.R;
 import com.android.settingslib.wrapper.PackageManagerWrapper;
 
 import java.util.ArrayList;
@@ -53,7 +54,7 @@ public class DefaultHomePreferenceController extends DefaultAppPreferenceControl
 
     @Override
     public boolean isAvailable() {
-        return true;
+        return mContext.getResources().getBoolean(R.bool.config_show_default_home);
     }
 
     @Override

tests/robotests/res/values-mcc999/config.xml

@@ -22,4 +22,5 @@
     <bool name="config_display_recent_apps">false</bool>
     <bool name="config_location_mode_available">false</bool>
     <bool name="config_show_wallpaper_attribution">false</bool>
+    <bool name="config_show_default_home">false</bool>
 </resources>

tests/robotests/src/com/android/settings/applications/DefaultAppSettingsTest.java

@@ -147,20 +147,19 @@ public class DefaultAppSettingsTest {
     @Test
     public void testNonIndexableKeys_existInXmlLayout() {
         final Context context = spy(RuntimeEnvironment.application);
-        final Context mockContext = mock(Context.class);
-        when(mockContext.getApplicationContext()).thenReturn(mockContext);
+        when(context.getApplicationContext()).thenReturn(context);
         final UserManager userManager = mock(UserManager.class, RETURNS_DEEP_STUBS);
 
-        when(mockContext.getSystemService(Context.USER_SERVICE))
+        when(context.getSystemService(Context.USER_SERVICE))
                 .thenReturn(userManager);
         when(userManager.getUserInfo(anyInt()).isRestricted()).thenReturn(true);
 
-        when(mockContext.getSystemService(Context.TELEPHONY_SERVICE))
+        when(context.getSystemService(Context.TELEPHONY_SERVICE))
                 .thenReturn(mock(TelephonyManager.class));
-        when(mockContext.getPackageManager())
+        when(context.getPackageManager())
                 .thenReturn(mock(PackageManager.class));
         final List<String> niks = DefaultAppSettings.SEARCH_INDEX_DATA_PROVIDER
-                .getNonIndexableKeys(mockContext);
+                .getNonIndexableKeys(context);
 
         final int xmlId = (new DefaultAppSettings()).getPreferenceScreenResId();
 

tests/robotests/src/com/android/settings/applications/defaultapps/DefaultHomePreferenceControllerTest.java

@@ -45,6 +45,7 @@ import org.mockito.Answers;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.annotation.Config;
+import org.robolectric.RuntimeEnvironment;
 import org.robolectric.util.ReflectionHelpers;
 
 import java.util.Arrays;
@@ -54,18 +55,18 @@ import java.util.Arrays;
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
 public class DefaultHomePreferenceControllerTest {
 
-    @Mock
-    private Context mContext;
     @Mock
     private UserManager mUserManager;
     @Mock(answer = Answers.RETURNS_DEEP_STUBS)
     private PackageManagerWrapper mPackageManager;
 
+    private Context mContext;
     private DefaultHomePreferenceController mController;
 
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
+        mContext = spy(RuntimeEnvironment.application);
         when(mContext.getSystemService(Context.USER_SERVICE)).thenReturn(mUserManager);
 
         mController = spy(new DefaultHomePreferenceController(mContext));
@@ -73,10 +74,16 @@ public class DefaultHomePreferenceControllerTest {
     }
 
     @Test
-    public void isAlwaysAvailable() {
+    public void testDefaultHome_byDefault_shouldBeShown() {
         assertThat(mController.isAvailable()).isTrue();
     }
 
+    @Test
+    @Config(qualifiers = "mcc999")
+    public void testDefaultHome_ifDisabled_shouldNotBeShown() {
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
     @Test
     public void getDefaultApp_shouldGetDefaultBrowserPackage() {
         assertThat(mController.getDefaultAppInfo()).isNotNull();