[Android] Return an error if createDataChannel failed.

cloudwebrtc · cloudwebrtc · commit d2e7bb1a968d · 2019-01-19T20:10:26.000+08:00
diff --git a/android/src/main/java/com/cloudwebrtc/webrtc/PeerConnectionObserver.java b/android/src/main/java/com/cloudwebrtc/webrtc/PeerConnectionObserver.java
@@ -133,12 +133,19 @@ void createDataChannel(String label, ConstraintsMap config, Result result) {
         // longer support them (in the face of multiple reported issues of
         // breakages).
         int dataChannelId = init.id;
-        if (-1 != dataChannelId) {
+        if (dataChannel != null && -1 != dataChannelId) {
             dataChannels.put(dataChannelId, dataChannel);
             registerDataChannelObserver(dataChannelId, dataChannel);
-        }
 
-        result.success(null);
+            ConstraintsMap params = new ConstraintsMap();
+            params.putInt("id", dataChannel.id());
+            params.putString("label", dataChannel.label());
+            result.success(params.toMap());
+        }else{
+            result.error("createDataChannel",
+                    "Can't create data-channel for id: " + dataChannelId,
+                    null);
+        }
     }
 
     void dataChannelClose(int dataChannelId) {
