add generic setAnalyticsPref functions for iOS and Android

android/ScratchJr/app/src/main/java/org/scratchjr/android/JavaScriptDirectInterface.java

@@ -629,4 +629,11 @@ public class JavaScriptDirectInterface {
             _activity.setAnalyticsPlacePref(place);
         }
     }
+
+    @JavascriptInterface
+    public void setAnalyticsPref(String prefObjStr) {
+        if (prefObjStr != null) {
+            _activity.setAnalyticsPref(prefObjStr);
+        }
+    }
 }

android/ScratchJr/app/src/main/java/org/scratchjr/android/ScratchJrActivity.java

@@ -41,6 +41,9 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 
+import org.json.JSONObject;
+import org.json.JSONArray;
+import org.json.JSONException;
 /**
  * Main activity for Scratch Jr., consisting of a full-screen landscape WebView.
  *
@@ -520,6 +523,22 @@ public class ScratchJrActivity
         _FirebaseAnalytics.setUserProperty("place_preference", place);
     }
 
+    /**
+     * Record a user property
+     * @param prefObjStr like "{\"school\": \"Central High\"}"
+     */
+    public void setAnalyticsPref(String prefObjStr) {
+        try {
+            JSONObject jsonObject = new JSONObject(prefObjStr);
+            JSONArray jsonArray = jsonObject.names();
+            String key = jsonArray.getString(0);
+            String value = jsonObject.getString(key);
+            _FirebaseAnalytics.setUserProperty(key, value);
+        } catch (JSONException e) {
+            // don't log anything to Firebase
+        }
+    }
+
     public void translateAndScaleRectToContainerCoords(RectF rect, float devicePixelRatio) {
         float wx = _webView.getX();
         float wy = _webView.getY();

ios/ScratchJr/src/ScratchJr.h

@@ -128,6 +128,7 @@
 - (NSString *) deviceName;
 - (NSString *) analyticsEvent:(NSString *)category :(NSString *)action :(NSString *)label;
 - (void) setAnalyticsPlacePref:(NSString *)place;
+- (void) setAnalyticsPref:(NSString *)prefObjStr;
 @end
 
 @interface ViewController : UIViewController <JSExports,UIWebViewDelegate,MFMailComposeViewControllerDelegate>

ios/ScratchJr/src/ViewController.m

@@ -333,6 +333,16 @@ JSContext *js;
     [FIRAnalytics setUserPropertyString:place forName:@"place_preference"];
 }
 
+// @param prefObjStr like "{\"place_preference\": \"School\"}"
+-(void) setAnalyticsPref:(NSString*)prefObjStr {
+    NSData* data = [prefObjStr dataUsingEncoding:NSUTF8StringEncoding];
+    NSDictionary* dict = [NSJSONSerialization JSONObjectWithData:data options:0 error: nil];
+    NSString *key = [[dict allKeys] firstObject];
+    NSString *value = [dict objectForKey: key];
+    [FIRAnalytics setUserPropertyString:value forName:key];
+}
+
+
 // iPad name (used for information in the name/sharing dialog to help people using Airdrop)
 - (NSString*) deviceName {
     return [[UIDevice currentDevice] name];

src/tablet/Android.js

@@ -261,6 +261,10 @@ export default class Android {
         AndroidInterface.setAnalyticsPlacePref(preferredPlace);
     }
 
+    static setAnalyticsPref (jsonStr) {
+        AndroidInterface.setAnalyticsPref(jsonStr);
+    }
+
     // // Web Wiew delegate call backs
     //
     // static pageError (desc) {

src/tablet/OS.js

@@ -253,6 +253,10 @@ export default class OS {
         tabletInterface.setAnalyticsPlacePref(preferredPlace);
     }
 
+    static setAnalyticsPref (key, value) {
+        tabletInterface.setAnalyticsPref(JSON.stringify({[key]: value}));
+    }
+
     // Web Wiew delegate call backs
 
     static pageError (desc) {

src/tablet/iOS.js

@@ -268,6 +268,10 @@ export default class iOS {
         window.tablet.setAnalyticsPlacePref(preferredPlace);
     }
 
+    static setAnalyticsPref (jsonStr) {
+        window.tablet.setAnalyticsPref(jsonStr);
+    }
+
     // // Web Wiew delegate call backs
     //
     // static pageError (desc) {