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/layout/actionbar_indeterminate_progress.xml

@@ -0,0 +1,23 @@
+<!--
+  Copyright 2013 Google Inc.
+
+  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.
+  -->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_height="wrap_content"
+    android:layout_width="56dp"
+    android:minWidth="56dp">
+    <ProgressBar android:layout_width="32dp"
+        android:layout_height="32dp"
+        android:layout_gravity="center"/>
+</FrameLayout>

app/src/main/res/layout/ble_list_item_device.xml

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+<?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.
+-->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+    <TextView android:id="@+id/device_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="24dp"/>
+    <TextView android:id="@+id/device_address"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="12dp"/>
+</LinearLayout>

app/src/main/res/layout/pref_select_ble_device_button.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<Button
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/selectBLEDeviceButton"
+    android:text="@string/select_ble_device_title"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:onClick="onClick"
+    >
+</Button>