Track when not the default WPCOM post URLs handler

WordPress/src/main/java/org/wordpress/android/ui/main/WPMainActivity.java

@@ -4,6 +4,9 @@
 import android.app.DialogFragment;
 import android.app.Fragment;
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
@@ -218,6 +221,12 @@ public void onPageScrolled(int position, float positionOffset, int positionOffse
             }
         }
         startService(new Intent(this, NotificationsScreenLockWatchService.class));
+
+        // ensure the deep linking activity is enabled. It may have been disabled elsewhere and failed to get re-enabled
+        WPActivityUtils.enableComponent(this, ReaderPostPagerActivity.class);
+
+        // monitor whether we're not the default app
+        trackDefaultApp();
     }
 
     @Override
@@ -345,7 +354,7 @@ protected void onResume() {
 
         new CheckUnseenNotesTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 
-        // ensure the deep linking activity is enabled. It may have been disabled elsewhere and failed to get re-enabled
+        // ensure the deep linking activity is enabled. We might be returning from the external-browser viewing of a post
         WPActivityUtils.enableComponent(this, ReaderPostPagerActivity.class);
 
         // We need to track the current item on the screen when this activity is resumed.
@@ -426,6 +435,16 @@ private void trackLastVisibleTab(int position, boolean trackAnalytics) {
         }
     }
 
+    private void trackDefaultApp() {
+        Intent wpcomIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.wordpresscom_sample_post)));
+        ResolveInfo resolveInfo = getPackageManager().resolveActivity(wpcomIntent, PackageManager.MATCH_DEFAULT_ONLY);
+        if (resolveInfo != null && !getPackageName().equals(resolveInfo.activityInfo.name)) {
+            // not set as default handler so, track this to evaluate. Note, a resolver/chooser might be the default.
+            AnalyticsUtils.trackWithDefaultInterceptor(AnalyticsTracker.Stat.DEEP_LINK_NOT_DEFAULT_HANDER,
+                    resolveInfo.activityInfo.name);
+        }
+    }
+
     public void setReaderTabActive() {
         if (isFinishing() || mTabLayout == null) return;
 

WordPress/src/main/java/org/wordpress/android/util/AnalyticsUtils.java

@@ -42,6 +42,7 @@ public class AnalyticsUtils {
     private static String INTENT_ACTION = "intent_action";
     private static String INTENT_DATA = "intent_data";
     private static String INTERCEPTED_URI = "intercepted_uri";
+    private static String INTERCEPTOR_CLASSNAME = "interceptor_classname";
 
     /**
      * Utility method to refresh mixpanel metadata.
@@ -277,7 +278,21 @@ public static void trackWithInterceptedUri(AnalyticsTracker.Stat stat, String in
         AnalyticsTracker.track(stat, properties);
     }
 
-  /**
+    /**
+     * Track when app launched via deep-linking but then fell back to external browser
+     *
+     * @param stat The Stat to bump
+     * @param interceptorClassname The name of the class that handles the intercept by default
+     *
+     */
+    public static void trackWithDefaultInterceptor(AnalyticsTracker.Stat stat, String interceptorClassname) {
+        Map<String, Object> properties =  new HashMap<>();
+        properties.put(INTERCEPTOR_CLASSNAME, interceptorClassname);
+
+        AnalyticsTracker.track(stat, properties);
+    }
+
+    /**
    * Track when a railcar item has been rendered
    *
    * @param post The JSON string of the railcar

WordPress/src/main/res/values/key_strings.xml

@@ -253,4 +253,6 @@
     <string name="asset_statements" translatable="false">
         [{\"include\": \"https://wordpress.com/.well-known/assetlinks.json\"}]
     </string>
+
+    <string name="wordpresscom_sample_post" translatable="false">https://en.blog.wordpress.com/2016/09/26/the-best-of-wordpress-september-2016/</string>
 </resources>

libs/analytics/WordPressAnalytics/src/main/java/org/wordpress/android/analytics/AnalyticsTracker.java

@@ -205,6 +205,7 @@ public enum Stat {
         TRAIN_TRACKS_INTERACT,
         DEEP_LINKED,
         DEEP_LINKED_FALLBACK,
+        DEEP_LINK_NOT_DEFAULT_HANDER,
     }
 
     private static final List<Tracker> TRACKERS = new ArrayList<>();

libs/analytics/WordPressAnalytics/src/main/java/org/wordpress/android/analytics/AnalyticsTrackerMixpanel.java

@@ -1171,6 +1171,10 @@ private AnalyticsTrackerMixpanelInstructionsForStat instructionsForStat(
                 instructions = AnalyticsTrackerMixpanelInstructionsForStat.
                         mixpanelInstructionsForEventName("Deep linked fallback");
                 break;
+            case DEEP_LINK_NOT_DEFAULT_HANDER:
+                instructions = AnalyticsTrackerMixpanelInstructionsForStat.
+                        mixpanelInstructionsForEventName("Deep link not default handler");
+                break;
             default:
                 instructions = null;
                 break;

libs/analytics/WordPressAnalytics/src/main/java/org/wordpress/android/analytics/AnalyticsTrackerNosara.java

@@ -618,6 +618,8 @@ public static String getEventNameForStat(AnalyticsTracker.Stat stat) {
                 return "deep_linked";
             case DEEP_LINKED_FALLBACK:
                 return "deep_linked_fallback";
+            case DEEP_LINK_NOT_DEFAULT_HANDER:
+                return "deep_link_not_default_handler";
             default:
                 return null;
         }