Show a prompt to request Bluetooth permission

app/src/main/java/io/bimmergestalt/bclclient/controllers/PermissionsController.kt

@@ -0,0 +1,18 @@
+package io.bimmergestalt.bclclient.controllers
+
+import android.Manifest
+import android.app.Activity
+import androidx.core.app.ActivityCompat
+
+class PermissionsController(val activity: Activity) {
+    companion object {
+        const val REQUEST_BLUETOOTH = 50
+    }
+    fun promptBluetoothConnect() {
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
+            ActivityCompat.requestPermissions(activity,
+                arrayOf(Manifest.permission.BLUETOOTH_CONNECT),
+                REQUEST_BLUETOOTH)
+        }
+    }
+}

app/src/main/java/io/bimmergestalt/bclclient/fragments/PermissionsFragment.kt

@@ -0,0 +1,28 @@
+package io.bimmergestalt.bclclient.fragments
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
+import io.bimmergestalt.bclclient.controllers.PermissionsController
+import io.bimmergestalt.bclclient.databinding.PermissionsBinding
+import io.bimmergestalt.bclclient.models.PermissionsViewModel
+
+class PermissionsFragment: Fragment() {
+    val viewModel by viewModels<PermissionsViewModel>()
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
+        val binding = PermissionsBinding.inflate(inflater, container, false)
+
+        binding.lifecycleOwner = viewLifecycleOwner
+        binding.controller = PermissionsController(requireActivity())
+        binding.viewModel = viewModel
+        return binding.root
+    }
+
+    override fun onResume() {
+        super.onResume()
+        viewModel.update(requireContext())
+    }
+}

app/src/main/java/io/bimmergestalt/bclclient/helpers/BindingAdapters.kt

@@ -23,6 +23,10 @@ fun setImageViewResource(view: ImageView, resource: Int) {
     view.setImageResource(resource)
 }
 
+@BindingAdapter("android:visibility")
+fun setViewVisibility(view: View, visible: Boolean) {
+    view.visibility = if (visible) View.VISIBLE else View.GONE
+}
 @BindingAdapter("android:foregroundTint")
 fun setForegroundTint(view: View, value: (Context.() -> Int)?) {
     value ?: return

app/src/main/java/io/bimmergestalt/bclclient/models/PermissionsViewModel.kt

@@ -0,0 +1,25 @@
+package io.bimmergestalt.bclclient.models
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import androidx.core.content.ContextCompat
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class PermissionsViewModel: ViewModel() {
+    private val _supportsBluetoothConnectPermission = MutableLiveData(false)
+    val supportsBluetoothConnectPermission: LiveData<Boolean> = _supportsBluetoothConnectPermission
+    private val _hasBluetoothConnectPermission = MutableLiveData(false)
+    val hasBluetoothConnectPermission: LiveData<Boolean> = _hasBluetoothConnectPermission
+
+    fun update(context: Context) {
+        _supportsBluetoothConnectPermission.value = android.os.Build.VERSION.SDK_INT >= 31
+        _hasBluetoothConnectPermission.value = if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) {
+            ContextCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED
+        } else {
+            true
+        }
+    }
+}

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

@@ -71,6 +71,12 @@
                 android:text="@{viewModel.proxyText}" />
         </androidx.appcompat.widget.LinearLayoutCompat>
 
+        <androidx.fragment.app.FragmentContainerView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:id="@+id/fragment_settings"
+            android:name="io.bimmergestalt.bclclient.fragments.PermissionsFragment"/>
+
         <Button
             android:id="@+id/button_first"
             android:layout_width="wrap_content"

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

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <data class="PermissionsBinding">
+        <variable
+            name="controller"
+            type="io.bimmergestalt.bclclient.controllers.PermissionsController" />
+        <variable
+            name="viewModel"
+            type="io.bimmergestalt.bclclient.models.PermissionsViewModel" />
+    </data>
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingBottom="16dp"
+            android:orientation="vertical"
+            android:gravity="center"
+            android:visibility="@{viewModel.supportsBluetoothConnectPermission &amp;&amp; !viewModel.hasBluetoothConnectPermission}">
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:gravity="center_vertical">
+                <ImageView
+                    android:layout_width="48dp"
+                    android:layout_height="48dp"
+                    android:padding="12dp"
+                    android:onClick="@{() -> controller.promptBluetoothConnect()}"
+                    app:srcCompat="@android:drawable/checkbox_off_background" />
+
+                <TextView
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:paddingTop="12dp"
+                    android:paddingBottom="12dp"
+                    android:text="@string/lbl_grant_permission_bluetooth_connect" />
+            </LinearLayout>
+            <Button
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/lbl_grant"
+                android:textSize="12sp"
+                android:onClick="@{() -> controller.promptBluetoothConnect()}" />
+        </LinearLayout>
+    </LinearLayout>
+</layout>

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

@@ -12,6 +12,9 @@
     <string name="sw_automatic_bluetooth_connect">Connect to Bluetooth automatically</string>
     <string name="service_shutdown">Shutdown</string>
 
+    <string name="lbl_grant_permission_bluetooth_connect">Grant Bluetooth connectivity access</string>
+    <string name="lbl_grant">Grant</string>
+
     <string name="status_transport_waiting">Waiting for car</string>
     <string name="status_transport_searching">Searching for car</string>
     <string name="status_transport_opening">Connecting to car</string>