MainFragment: Show pairing status in status line.

app/src/main/java/de/ccc/events/badge/card10/main/MainFragment.kt

@@ -22,24 +22,36 @@
 
 package de.ccc.events.badge.card10.main
 
+import android.bluetooth.BluetoothAdapter
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
-import android.widget.TextView
 import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.fragment.app.Fragment
+import de.ccc.events.badge.card10.CARD10_BLUETOOTH_MAC_PREFIX
 import de.ccc.events.badge.card10.R
 import de.ccc.events.badge.card10.common.ConnectionService
 import de.ccc.events.badge.card10.scanner.ScannerFragment
 import kotlinx.android.synthetic.main.main_fragment.*
 
 class MainFragment : Fragment() {
+    private val bluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
+
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?) =
         inflater.inflate(R.layout.main_fragment, container, false)
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        val bondedCard10s =
+            bluetoothAdapter.bondedDevices.filter { it.address.startsWith(CARD10_BLUETOOTH_MAC_PREFIX, true) }
+        if (bondedCard10s.isNotEmpty()) {
+            val device = bondedCard10s.get(0)
+            label_status.text = getString(R.string.main_label_paired, device.name, device.address)
+        } else {
+            label_status.text = getString(R.string.main_label_not_connected)
+        }
+
         if (ConnectionService.isConnected()) {
             showConnectedView(view)
         } else {
@@ -51,10 +63,6 @@ class MainFragment : Fragment() {
         view.findViewById<ConstraintLayout>(R.id.container_connected).visibility = View.VISIBLE
         view.findViewById<ConstraintLayout>(R.id.container_disconnected).visibility = View.GONE
 
-        val tvStatus = view.findViewById<TextView>(R.id.label_status)
-        tvStatus.text =
-            getString(R.string.main_label_status, ConnectionService.deviceName, ConnectionService.deviceAddress)
-
         val buttonSend = view.findViewById<Button>(R.id.button_send)
         buttonSend.setOnClickListener {
             // TODO: Open file transfer fragment
@@ -65,9 +73,6 @@ class MainFragment : Fragment() {
         view.findViewById<ConstraintLayout>(R.id.container_connected).visibility = View.GONE
         view.findViewById<ConstraintLayout>(R.id.container_disconnected).visibility = View.VISIBLE
 
-        val tvStatus = view.findViewById<TextView>(R.id.label_status)
-        tvStatus.text = getString(R.string.main_label_not_connected)
-
         button_pair.setOnClickListener {
             fragmentManager!!.beginTransaction()
                 .replace(R.id.fragment_container, ScannerFragment())

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

 <resources>
     <string name="app_name">card10 Companion</string>
 
+    <string name="main_label_paired">You are paired to %1$s (%2$s)</string>
     <string name="main_label_not_connected">You are currently not connected to your card10.</string>
     <string name="main_label_status">You are connected to %1$s (%2$s)</string>
     <string name="main_button_connect">Connect</string>