JS can call Android and get a value back!

app/build.gradle

@@ -67,6 +67,7 @@ dependencies {
     compile 'com.netflix.rxjava:rxjava-android:+'
     compile 'com.android.support:appcompat-v7:20.+'
     compile 'org.apache.commons:commons-lang3:+'
+    compile 'com.google.code.gson:gson:+'
 
     androidTestCompile 'com.jayway.awaitility:awaitility:+'
     androidTestCompile 'org.mockito:mockito-core:+'

app/src/main/assets/dist/book-bundle.js

@@ -31,6 +31,8 @@ window.appendVerse = function(text) {
   return scope.$apply();
 };
 
+console.log(Android.testReturn("Good morning."));
+
 
 /*
 Future reference: Get the controller scope like so:

app/src/main/assets/src/book.coffee

@@ -23,6 +23,8 @@ window.appendVerse = (text) ->
 	# Since we're calling outside of angular, we need to manually apply
 	scope.$apply()
 
+console.log Android.testReturn "Good morning."
+
 ###
 Future reference: Get the controller scope like so:
 angular.element($("<controller-element>")).scope().<function>

app/src/main/java/org/bspeice/minimalbible/activity/viewer/BookFragment.java

@@ -7,6 +7,7 @@ import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.JavascriptInterface;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 
@@ -125,6 +126,15 @@ public class BookFragment extends BaseFragment {
             }
         });
 
+        // We can receive and return only primitives and Strings. Still means we can use JSON :)
+        mainContent.addJavascriptInterface(new Object() {
+            @JavascriptInterface
+            @SuppressWarnings("unused")
+            public String testReturn(String echo) {
+                return echo;
+            }
+        }, "Android");
+
         // TODO: Remove remote debugging when ready - or should this be removed?
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
             WebView.setWebContentsDebuggingEnabled(true);