Add a friendly error message when no video traffic is received

app/src/main/java/com/limelight/Game.java

@@ -1538,9 +1538,21 @@ public class Game extends Activity implements SurfaceHolder.Callback,
 
                     // Display the error dialog if it was an unexpected termination.
                     // Otherwise, just finish the activity immediately.
-                    if (errorCode != 0) {
+                    if (errorCode != MoonBridge.ML_ERROR_GRACEFUL_TERMINATION) {
+                        String message;
+
+                        switch (errorCode) {
+                            case MoonBridge.ML_ERROR_NO_VIDEO_TRAFFIC:
+                                message = getResources().getString(R.string.no_video_received_error);
+                                break;
+
+                            default:
+                                message = getResources().getString(R.string.conn_terminated_msg);
+                                break;
+                        }
+
                         Dialog.displayDialog(Game.this, getResources().getString(R.string.conn_terminated_title),
-                                getResources().getString(R.string.conn_terminated_msg), true);
+                                message, true);
                     }
                     else {
                         finish();

app/src/main/java/com/limelight/nvstream/jni/MoonBridge.java

@@ -33,6 +33,9 @@ public class MoonBridge {
     public static final int CONN_STATUS_OKAY = 0;
     public static final int CONN_STATUS_POOR = 1;
 
+    public static final int ML_ERROR_GRACEFUL_TERMINATION = 0;
+    public static final int ML_ERROR_NO_VIDEO_TRAFFIC = -100;
+
     private static AudioRenderer audioRenderer;
     private static VideoDecoderRenderer videoRenderer;
     private static NvConnectionListener connectionListener;

app/src/main/res/values/strings.xml

@@ -61,6 +61,7 @@
     <string name="error_usb_prohibited">USB access is prohibited by your device administrator. Check your Knox or MDM settings.</string>
     <string name="unable_to_pin_shortcut">Your current launcher does not allow for creating pinned shortcuts.</string>
     <string name="video_decoder_init_failed">Video decoder failed to initialize. Your device may not support the selected resolution or frame rate.</string>
+    <string name="no_video_received_error">No video received from host. Check the host PC\'s firewall and port forwarding rules.</string>
 
     <!-- Start application messages -->
     <string name="conn_establishing_title">Establishing Connection</string>