Add "App X successfully installed" to updates tab.

This notification is kind of weird, because the only ways it can be
dismissed is by:
 * Swiping a notification away from the notification drawer.
 * Closing and reopening F-Droid.

However I think the UX is still pretty nice:
 * Tells the user that it worked.
 * Allows them to navigate to it if desired.

app/src/main/java/org/fdroid/fdroid/views/apps/AppListItemController.java

@@ -253,6 +253,18 @@ public class AppListItemController extends RecyclerView.ViewHolder {
         return false;
     }
 
+    /**
+     * Queries the {@link AppUpdateStatusManager} and asks if the app was just successfully installed.
+     */
+    private boolean wasSuccessfullyInstalled(@NonNull App app) {
+        for (AppUpdateStatusManager.AppUpdateStatus appStatus : AppUpdateStatusManager.getInstance(activity).getByPackageName(app.packageName)) {
+            if (appStatus.status == AppUpdateStatusManager.Status.Installed) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     /**
      * The app name {@link TextView} is used for a few reasons:
      *  * Display name + summary of the app (most common).
@@ -276,6 +288,8 @@ public class AppListItemController extends RecyclerView.ViewHolder {
             }
         } else if (isDownloading(app)) {
             name.setText(activity.getString(R.string.app_list__name__downloading_in_progress, app.name));
+        } else if (wasSuccessfullyInstalled(app)) {
+            name.setText(activity.getString(R.string.app_list__name__successfully_installed, app.name));
         } else {
             name.setText(Utils.formatAppNameAndSummary(app.name, app.summary));
         }

app/src/main/java/org/fdroid/fdroid/views/updates/UpdatesAdapter.java

@@ -92,8 +92,7 @@ public class UpdatesAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
 
     /**
      * There are some statuses managed by {@link AppUpdateStatusManager} which we don't care about
-     * for the "Updates" view. For example {@link org.fdroid.fdroid.AppUpdateStatusManager.Status#Installed}
+     * for the "Updates" view. For example Also, although this
-     * apps are not interesting in the Updates" view at this point in time. Also, although this
      * adapter does know about apps with updates availble, it does so by querying the database not
      * by querying the app update status manager. As such, apps with the status
      * {@link org.fdroid.fdroid.AppUpdateStatusManager.Status#UpdateAvailable} are not interesting here.
@@ -101,6 +100,7 @@ public class UpdatesAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder
     private boolean shouldShowStatus(AppUpdateStatusManager.AppUpdateStatus status) {
         return status.status == AppUpdateStatusManager.Status.Unknown ||
                 status.status == AppUpdateStatusManager.Status.Downloading ||
+                status.status == AppUpdateStatusManager.Status.Installed ||
                 status.status == AppUpdateStatusManager.Status.ReadyToInstall;
     }
 

app/src/main/res/values/strings.xml

@@ -73,6 +73,7 @@
     <string name="app_list__name__downloaded_and_ready_to_update">Update %1$s</string>
     <string name="app_list__name__downloaded_and_ready_to_install">Install %1$s</string>
     <string name="app_list__name__downloading_in_progress">Downloading %1$s</string>
+    <string name="app_list__name__successfully_installed">%1$s successfully installed</string>
     <plurals name="app_list__age__released_x_days_ago">
         <item quantity="one">Released %1$d day ago</item>
         <item quantity="other">Released %1$d days ago</item>