Display "pair new" only when local output device is available.

-If media app does not support cast->phone transferring, local output
audio device is unavailable. "pair new" is for Bluetooth which should be
also unavilable.
-These types are local output audio devices:
TYPE_BUILTIN_SPEAKER
TYPE_WIRED_HEADSET
TYPE_WIRED_HEADPHONES
TYPE_USB_DEVICE
TYPE_USB_HEADSET
TYPE_USB_ACCESSORY
TYPE_DOCK
TYPE_HDMI

Bug: 163095048
Test: make -j50 RunSettingsRoboTests
Change-Id: Ib844c7546e1946cb87fac04cb8b2b8f4acf06451

src/com/android/settings/media/MediaOutputSlice.java

@@ -106,10 +106,15 @@ public class MediaOutputSlice implements CustomSliceable {
             final MediaDevice connectedDevice = worker.getCurrentConnectedMediaDevice();
             if (devices.size() == 1) {
                 // Zero state
-                for (MediaDevice device : devices) {
+                final MediaDevice device = devices.iterator().next();
-                    addRow(device, device, listBuilder);
+                addRow(device, device, listBuilder);
+                // Add "pair new" only when local output device exists
+                final int type = device.getDeviceType();
+                if (type == MediaDevice.MediaDeviceType.TYPE_PHONE_DEVICE
+                        || type == MediaDevice.MediaDeviceType.TYPE_3POINT5_MM_AUDIO_DEVICE
+                        || type == MediaDevice.MediaDeviceType.TYPE_USB_C_AUDIO_DEVICE) {
+                    listBuilder.addRow(getPairNewRow());
                 }
-                listBuilder.addRow(getPairNewRow());
             } else {
                 final boolean isTouched = worker.getIsTouched();
                 // Fix the last top device when user press device to transfer.