exit app info page if app is a hidden system module.

Fixes: 120546598
Test: robotest
Change-Id: I763ce9d65904e2b0c2a6144776c42881a1269c52

src/com/android/settings/applications/appinfo/AppInfoDashboardFragment.java

@@ -187,6 +187,9 @@ public class AppInfoDashboardFragment extends DashboardFragment
         if (!ensurePackageInfoAvailable(activity)) {
             return;
         }
+        if (!ensureDisplayableModule(activity)) {
+            return;
+        }
         startListeningToPackageRemove();
 
         setHasOptionsMenu(true);
@@ -260,8 +263,8 @@ public class AppInfoDashboardFragment extends DashboardFragment
                 new InstantAppButtonsPreferenceController(context, this, packageName, lifecycle);
         controllers.add(mInstantAppButtonPreferenceController);
         mAppButtonsPreferenceController = new AppButtonsPreferenceController(
-            (SettingsActivity) getActivity(), this, lifecycle, packageName, mState,
+                (SettingsActivity) getActivity(), this, lifecycle, packageName, mState,
-            REQUEST_UNINSTALL, REQUEST_REMOVE_DEVICE_ADMIN);
+                REQUEST_UNINSTALL, REQUEST_REMOVE_DEVICE_ADMIN);
         controllers.add(mAppButtonsPreferenceController);
         controllers.add(new AppBatteryPreferenceController(context, this, packageName, lifecycle));
         controllers.add(new AppMemoryPreferenceController(context, this, lifecycle));
@@ -318,6 +321,23 @@ public class AppInfoDashboardFragment extends DashboardFragment
         return true;
     }
 
+    /**
+     * Ensures the package is displayable as directed by {@link AppUtils#isHiddenSystemModule}.
+     * If it's not, the fragment will finish.
+     *
+     * @return true if package is displayable.
+     */
+    @VisibleForTesting
+    boolean ensureDisplayableModule(Activity activity) {
+        if (AppUtils.isHiddenSystemModule(activity.getApplicationContext(), mPackageName)) {
+            mFinishing = true;
+            Log.w(TAG, "Package is hidden module, exiting: " + mPackageName);
+            activity.finishAndRemoveTask();
+            return false;
+        }
+        return true;
+    }
+
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);

tests/robotests/src/com/android/settings/applications/appinfo/AppInfoDashboardFragmentTest.java

@@ -17,8 +17,7 @@
 package com.android.settings.applications.appinfo;
 
 import static com.android.settings.applications.appinfo.AppInfoDashboardFragment.ARG_PACKAGE_NAME;
-import static com.android.settings.applications.appinfo.AppInfoDashboardFragment
+import static com.android.settings.applications.appinfo.AppInfoDashboardFragment.UNINSTALL_ALL_USERS_MENU;
-        .UNINSTALL_ALL_USERS_MENU;
 import static com.android.settings.applications.appinfo.AppInfoDashboardFragment.UNINSTALL_UPDATES;
 
 import static com.google.common.truth.Truth.assertThat;
@@ -43,6 +42,7 @@ import android.content.pm.PackageManager;
 import android.content.pm.UserInfo;
 import android.os.Bundle;
 import android.os.UserManager;
+import android.util.ArraySet;
 import android.view.Menu;
 import android.view.MenuItem;
 
@@ -53,6 +53,7 @@ import com.android.settingslib.applications.ApplicationsState.AppEntry;
 import com.android.settingslib.applications.instantapps.InstantAppDataProvider;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -63,10 +64,14 @@ import org.mockito.MockitoAnnotations;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.annotation.Resetter;
 import org.robolectric.util.ReflectionHelpers;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 
 @RunWith(RobolectricTestRunner.class)
 public final class AppInfoDashboardFragmentTest {
@@ -101,6 +106,11 @@ public final class AppInfoDashboardFragmentTest {
                 (InstantAppDataProvider) (i -> false));
     }
 
+    @After
+    public void tearDown() {
+        ShadowAppUtils.reset();
+    }
+
     @Test
     public void shouldShowUninstallForAll_installForOneOtherUserOnly_shouldReturnTrue() {
         when(mDevicePolicyManager.packageHasActiveAdmins(nullable(String.class))).thenReturn(false);
@@ -186,6 +196,24 @@ public final class AppInfoDashboardFragmentTest {
         verify(mActivity, never()).finishAndRemoveTask();
     }
 
+    @Test
+    @Config(shadows = ShadowAppUtils.class)
+    public void ensureDisplayableModule_hiddenModule_shouldReturnFalse() {
+        ShadowAppUtils.addHiddenModule(PACKAGE_NAME);
+        ReflectionHelpers.setField(mFragment, "mPackageName", PACKAGE_NAME);
+
+
+        assertThat(mFragment.ensureDisplayableModule(mActivity)).isFalse();
+    }
+
+    @Test
+    @Config(shadows = ShadowAppUtils.class)
+    public void ensureDisplayableModule_regularApp_shouldReturnTrue() {
+        ReflectionHelpers.setField(mFragment, "mPackageName", PACKAGE_NAME);
+
+        assertThat(mFragment.ensureDisplayableModule(mActivity)).isTrue();
+    }
+
     @Test
     public void createPreference_hasNoPackageInfo_shouldSkip() {
         ReflectionHelpers.setField(mFragment, "mPackageInfo", null);
@@ -240,7 +268,8 @@ public final class AppInfoDashboardFragmentTest {
         doReturn(true).when(mFragment).refreshUi();
 
         mFragment
-            .onActivityResult(AppInfoDashboardFragment.REQUEST_UNINSTALL, 0, mock(Intent.class));
+                .onActivityResult(AppInfoDashboardFragment.REQUEST_UNINSTALL, 0,
+                        mock(Intent.class));
 
         verify(mActivity).invalidateOptionsMenu();
     }
@@ -347,4 +376,24 @@ public final class AppInfoDashboardFragmentTest {
                 .containsKey(ARG_PACKAGE_NAME))
                 .isTrue();
     }
+
+    @Implements(AppUtils.class)
+    public static class ShadowAppUtils {
+
+        public static Set<String> sHiddenModules = new ArraySet<>();
+
+        @Resetter
+        public static void reset() {
+            sHiddenModules.clear();
+        }
+
+        public static void addHiddenModule(String pkg) {
+            sHiddenModules.add(pkg);
+        }
+
+        @Implementation
+        protected static boolean isHiddenSystemModule(Context context, String packageName) {
+            return sHiddenModules.contains(packageName);
+        }
+    }
 }