Added button in settings to select BLE device. Note may have broken theme so UI looks odd - actionbar may be missing...

app/src/main/res/menu/ble_scan_menu.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2013 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<menu xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@+id/menu_refresh"
+        android:checkable="false"
+        android:orderInCategory="1"
+        app:showAsAction="ifRoom" />
+    <item android:id="@+id/menu_scan"
+        android:title="@string/menu_scan"
+        android:orderInCategory="100"
+        app:showAsAction="ifRoom|withText" />
+    <item android:id="@+id/menu_stop"
+        android:title="@string/menu_stop"
+        android:orderInCategory="101"
+        app:showAsAction="ifRoom|withText" />
+</menu>