Changed MainActivity to request bluetooth on start.

If bluetooth is denied, we exit with an error toast.

app/src/main/AndroidManifest.xml

@@ -2,6 +2,9 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.nutomic.ensichat" >
 
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+
     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
@@ -16,6 +19,7 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <service android:name=".bluetooth.ChatService" />
     </application>
 
 </manifest>

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

@@ -9,4 +9,6 @@
 
     <string name="no_contacts_found">No contacts found :(</string>
 
+    <string name="bluetooth_required">Bluetooth is required for this app.</string>
+
 </resources>

app/src/main/scala/com/nutomic/ensichat/activities/MainActivity.scala

@@ -1,15 +1,31 @@
 package com.nutomic.ensichat.activities
 
 import android.app.Activity
+import android.bluetooth.BluetoothAdapter
+import android.content._
 import android.os.Bundle
-
+import android.widget.Toast
 import com.nutomic.ensichat.R
 
 class MainActivity extends Activity {
 
+  private final val REQUEST_ENABLE_BLUETOOTH = 1
+
   override def onCreate(savedInstanceState: Bundle): Unit = {
     super.onCreate(savedInstanceState)
     setContentView(R.layout.activity_main)
+    val intent: Intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
+    startActivityForResult(intent, REQUEST_ENABLE_BLUETOOTH)
+  }
+
+  override def onActivityResult(requestCode: Int, resultCode: Int, data: Intent): Unit = {
+    requestCode match {
+      case REQUEST_ENABLE_BLUETOOTH =>
+        if (resultCode != Activity.RESULT_OK) {
+          Toast.makeText(this, R.string.bluetooth_required, Toast.LENGTH_LONG).show()
+          finish()
+        }
+    }
   }
 
 }