Fixes crash from selecting uninstalled app info from recents.

- when the package is uninstalled, also remove it from the recent tasks
- move retrieveAppEntry() from onCreate() to getPreferenceControllers()
so that if the package info is invalid, do not create any controllers,
as the activity will be finished anyway.

Change-Id: Ibbfa16e3d1f941a0a200e78ec73a06ca8511f82b
Fixes: 72656345
Test: make RunSettingsRoboTests

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

@@ -162,13 +162,12 @@ public class AppInfoDashboardFragment extends DashboardFragment
         mUserManager = (UserManager) activity.getSystemService(Context.USER_SERVICE);
         mPm = activity.getPackageManager();
 
-        retrieveAppEntry();
-        startListeningToPackageRemove();
-
         if (!ensurePackageInfoAvailable(activity)) {
             return;
         }
 
+        startListeningToPackageRemove();
+
         mForceStopOptionsMenuController =
             new ForceStopOptionsMenuController(activity, this /* parent */, mDpm,
                 mMetricsFeatureProvider, getLifecycle());
@@ -205,6 +204,10 @@ public class AppInfoDashboardFragment extends DashboardFragment
 
     @Override
     protected List<AbstractPreferenceController> getPreferenceControllers(Context context) {
+        retrieveAppEntry();
+        if (mPackageInfo == null) {
+            return null;
+        }
         final String packageName = getPackageName();
         final List<AbstractPreferenceController> controllers = new ArrayList<>();
         final Lifecycle lifecycle = getLifecycle();
@@ -262,9 +265,6 @@ public class AppInfoDashboardFragment extends DashboardFragment
     }
 
     ApplicationsState.AppEntry getAppEntry() {
-        if (mAppEntry == null) {
-            retrieveAppEntry();
-        }
         return mAppEntry;
     }
 
@@ -273,9 +273,6 @@ public class AppInfoDashboardFragment extends DashboardFragment
     }
 
     PackageInfo getPackageInfo() {
-        if (mAppEntry == null) {
-            retrieveAppEntry();
-        }
         return mPackageInfo;
     }
 
@@ -361,7 +358,12 @@ public class AppInfoDashboardFragment extends DashboardFragment
                             PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER)
                             .execute((Object) null);
                 }
-                // continue with following operations
+                if (!refreshUi()) {
+                    onPackageRemoved();
+                } else {
+                    startListeningToPackageRemove();
+                }
+                break;
             case REQUEST_REMOVE_DEVICE_ADMIN:
                 if (!refreshUi()) {
                     setIntentAndFinish(true, true);
@@ -622,7 +624,8 @@ public class AppInfoDashboardFragment extends DashboardFragment
         return mPackageName;
     }
 
-    private void retrieveAppEntry() {
+    @VisibleForTesting
+    void retrieveAppEntry() {
         final Activity activity = getActivity();
         if (activity == null) {
             return;

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

@@ -19,6 +19,7 @@ package com.android.settings.applications.appinfo;
 import static com.google.common.truth.Truth.assertThat;
 
 import static org.mockito.ArgumentMatchers.nullable;
+import static org.mockito.Mockito.doNothing;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
@@ -190,6 +191,22 @@ public final class AppInfoDashboardFragmentTest {
         verify(mActivity).invalidateOptionsMenu();
     }
 
+    @Test
+    public void onActivityResult_packageUninstalled_shouldFinishAndRemoveTask() {
+        doReturn(false).when(mFragment).refreshUi();
+
+        mFragment.onActivityResult(mFragment.REQUEST_UNINSTALL, 0, mock(Intent.class));
+
+        verify(mActivity).finishAndRemoveTask();
+    }
+
+    @Test
+    public void getPreferenceControllers_noPackageInfo_shouldReturnNull() {
+        doNothing().when(mFragment).retrieveAppEntry();
+
+        assertThat(mFragment.getPreferenceControllers(mShadowContext)).isNull();
+    }
+
     @Test
     public void getNumberOfUserWithPackageInstalled_twoUsersInstalled_shouldReturnTwo()
             throws PackageManager.NameNotFoundException{