Don't show Bluetooth visibility dialog so often.

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

@@ -76,7 +76,9 @@ class FirstStartActivity extends AppCompatActivity with OnEditorActionListener w
   }
 
   def startMainActivity(): Unit = {
-    startActivity(new Intent(this, classOf[MainActivity]))
+    val intent = new Intent(this, classOf[MainActivity])
+    intent.setAction(MainActivity.ActionRequestBluetooth)
+    startActivity(intent)
     finish()
   }
 

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

@@ -12,9 +12,18 @@ import com.nutomic.ensichat.protocol.Address
 
 object MainActivity {
 
+  /**
+   * If this action is set, a dialog will be shown to request the device to be discoverable.
+   *
+   * This should only be used when the app is started from a launcher
+   * (eg from [[FirstStartActivity]]).
+   */
+  val ActionRequestBluetooth = "request_bluetooth"
+
   val ActionOpenChat = "open_chat"
 
   val ExtraAddress = "address"
+
 }
 
 /**
@@ -35,9 +44,13 @@ class MainActivity extends EnsichatActivity {
     super.onCreate(savedInstanceState)
     setContentView(R.layout.activity_main)
 
+    if (getIntent.getAction == MainActivity.ActionRequestBluetooth) {
       val intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE)
       intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 0)
       startActivityForResult(intent, RequestSetDiscoverable)
+      // Make sure this code isn't executed after screen rotate etc.
+      getIntent.setAction(null)
+    }
 
     val fm = getFragmentManager
     if (savedInstanceState != null) {