jquerius · May 3, 2021 22:14 · Apr 15, 2018 · Apr 15, 2018 · Apr 15, 2018
diff --git a/ActivityFragmentExample.kt b/ActivityFragmentExample.kt
@@ -1,18 +1,15 @@
 class ExampleFragment : Fragment() {
-
+    
     // this is the instance of our parent activity's interface that we define here 
     private var mListener: OnFragmentInteractionListener? = null
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
     }
-
     fun onButtonPressed(uri: Uri) {
         if (mListener != null) {
             mListener!!.onFragmentInteraction(uri)
         }
     }
-
     override fun onAttach(context: Context?) {
         super.onAttach(context)
         if (context is OnFragmentInteractionListener) {
@@ -21,29 +18,28 @@ class ExampleFragment : Fragment() {
             throw RuntimeException(context!!.toString() + " must implement OnFragmentInteractionListener")
         }
     }
-
     override fun onDetach() {
         super.onDetach()
         mListener = null
     }
-
+    /**
+     * Here we define the methods that we can fire off 
+     * in our parent Activity once something has changed
+     * within the fragment. 
+     */
     interface OnFragmentInteractionListener {
         fun onFragmentInteraction(uri: Uri)
     }
-
 }
 
 class AddVehicleActivity : AddVehicleStep1.OnFragmentInteractionListener, AppCompatActivity() {
-
     // this is the callback-like function that will run when the fragment 
     // tells it to 
     override fun onFragmentInteraction(uri: Uri) {
         // save some data from the fragment...
         // other business logic...
     }
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
     }
-
 }
diff --git a/ActivityFragmentExample.kt b/ActivityFragmentExample.kt
@@ -1,5 +1,6 @@
 class ExampleFragment : Fragment() {
 
+    // this is the instance of our parent activity's interface that we define here 
     private var mListener: OnFragmentInteractionListener? = null
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -33,7 +34,9 @@ class ExampleFragment : Fragment() {
 }
 
 class AddVehicleActivity : AddVehicleStep1.OnFragmentInteractionListener, AppCompatActivity() {
-
+
+    // this is the callback-like function that will run when the fragment 
+    // tells it to 
     override fun onFragmentInteraction(uri: Uri) {
         // save some data from the fragment...
         // other business logic...

diff --git a/ActivityFragmentExample.kt b/ActivityFragmentExample.kt
@@ -0,0 +1,46 @@
+class ExampleFragment : Fragment() {
+
+    private var mListener: OnFragmentInteractionListener? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+    }
+
+    fun onButtonPressed(uri: Uri) {
+        if (mListener != null) {
+            mListener!!.onFragmentInteraction(uri)
+        }
+    }
+
+    override fun onAttach(context: Context?) {
+        super.onAttach(context)
+        if (context is OnFragmentInteractionListener) {
+            mListener = context
+        } else {
+            throw RuntimeException(context!!.toString() + " must implement OnFragmentInteractionListener")
+        }
+    }
+
+    override fun onDetach() {
+        super.onDetach()
+        mListener = null
+    }
+
+    interface OnFragmentInteractionListener {
+        fun onFragmentInteraction(uri: Uri)
+    }
+
+}
+
+class AddVehicleActivity : AddVehicleStep1.OnFragmentInteractionListener, AppCompatActivity() {
+
+    override fun onFragmentInteraction(uri: Uri) {
+        // save some data from the fragment...
+        // other business logic...
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+    }
+
+}