Turn MainActivity into a menu with status

app/src/main/java/com/github/antweb/donkey/ConnectionService.kt

+package com.github.antweb.donkey
+
+import android.bluetooth.BluetoothDevice
+
+object ConnectionService {
+    var device: BluetoothDevice? = null
+
+    val deviceName: String?
+        get() = device?.name
+
+    val deviceAddress: String?
+        get() = device?.address
+
+    fun hasDevice(): Boolean {
+        return device != null
+    }
+}
\ No newline at end of file

app/src/main/java/com/github/antweb/donkey/MainActivity.kt

@@ -10,19 +10,34 @@ private const val TAG = "MainActivity"
 
 class MainActivity : AppCompatActivity() {
 
-    private lateinit var tvConnection: TextView
-    private lateinit var tvValue: TextView
-    private lateinit var buttonConnect: Button
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
 
-        tvValue = findViewById(R.id.text_value)
-        tvConnection = findViewById(R.id.text_connection_status)
-        tvConnection.text = "STATE_DISCONNECTED"
+        if (ConnectionService.hasDevice()) {
+            showConnectedView()
+        } else {
+            showNotConnectedView()
+        }
+    }
+
+    private fun showConnectedView() {
+        setContentView(R.layout.activity_main_connected)
+
+        val buttonSend = findViewById<Button>(R.id.button_send)
+        buttonSend.setOnClickListener {
+            val intent = Intent(this, SendActivity::class.java)
+            startActivity(intent)
+        }
+
+        val tvStatus = findViewById<TextView>(R.id.label_status)
+        tvStatus.text =
+            getString(R.string.main_label_status, ConnectionService.deviceName, ConnectionService.deviceAddress)
+    }
+
+    private fun showNotConnectedView() {
+        setContentView(R.layout.activity_main_not_connected)
 
-        buttonConnect = findViewById(R.id.button_connect)
+        val buttonConnect = findViewById<Button>(R.id.button_connect)
         buttonConnect.setOnClickListener {
             val intent = Intent(this, ScanActivity::class.java)
             startActivity(intent)

app/src/main/java/com/github/antweb/donkey/ScanActivity.kt

@@ -41,8 +41,8 @@ class ScanActivity : AppCompatActivity() {
             val item = adapterView.adapter.getItem(i) as? BluetoothDevice
 
             if (item != null) {
-                selectedDevice = item
-                val intent = Intent(this, SendActivity::class.java)
+                ConnectionService.device = item
+                val intent = Intent(this, MainActivity::class.java)
                 startActivity(intent)
             }
         }

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

+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent">
+
+    <TextView android:layout_width="wrap_content"
+              android:layout_height="wrap_content"
+              android:id="@+id/label_status"/>
+
+    <Button android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:id="@+id/button_send"
+            android:text="@string/main_button_send"/>
+
+</LinearLayout>
\ No newline at end of file

app/src/main/res/layout/activity_main.xml → app/src/main/res/layout/activity_main_not_connected.xml

 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-        xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:tools="http://schemas.android.com/tools"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:orientation="vertical"
-        tools:context=".MainActivity">
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent">
 
     <TextView android:layout_width="wrap_content"
               android:layout_height="wrap_content"
-              android:id="@+id/text_connection_status"
-    />
-
-    <TextView android:layout_width="wrap_content"
-              android:layout_height="wrap_content"
-              android:id="@+id/text_value"
-    />
+              android:text="@string/main_label_not_connected"/>
 
     <Button android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@string/main_button_connect"
-            android:id="@+id/button_connect"
-    />
+            android:id="@+id/button_connect"/>
 
 </LinearLayout>
\ No newline at end of file

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

 <resources>
-    <string name="app_name">BLE File Transfer</string>
-    <string name="main_activity_title">BLE File Transfer</string>
-    <string name="main_button_connect">Reconnect</string>
+    <string name="app_name">card10</string>
+
     <string name="scan_activity_title">Scan Devices</string>
     <string name="send_activity_title">Send File</string>
+
+    <string name="main_activity_title">@string/app_name</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>
+    <string name="main_button_send">Send File</string>
 </resources>