Merge "Support battery level reporting via Plantronics XEVENT (1/2)"

core/java/android/bluetooth/BluetoothHeadset.java

@@ -198,6 +198,18 @@ public final class BluetoothHeadset implements BluetoothProfile {
      */
     public static final String VENDOR_RESULT_CODE_COMMAND_ANDROID = "+ANDROID";
 
+    /**
+     * A vendor-specific AT command
+     * @hide
+     */
+    public static final String VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT = "+XEVENT";
+
+    /**
+     * Battery level indicator associated with {@link #VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT}
+     * @hide
+     */
+    public static final String VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT_BATTERY_LEVEL = "BATTERY";
+
     /**
      * Headset state when SCO audio is not connected.
      * This state can be one of