Handle permissions

app/src/main/AndroidManifest.xml

@@ -23,7 +23,7 @@
 
     <uses-permission android:name="android.permission.BLUETOOTH"/>
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
-    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
 
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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

 package com.github.antweb.donkey
 
+import android.Manifest
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.os.Bundle
 import android.widget.Button
 import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
 
 private const val TAG = "MainActivity"
+private const val REQUEST_CODE_PERMISSIONS = 1
 
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        if (ConnectionService.hasDevice()) {
+        val locationPermission =
+            ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
+        val storagePermission =
+            ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
+
+        if (locationPermission != PackageManager.PERMISSION_GRANTED ||
+            storagePermission != PackageManager.PERMISSION_GRANTED
+        ) {
+            showPermissionView()
+        } else if (ConnectionService.hasDevice()) {
             showConnectedView()
         } else {
             showNotConnectedView()
         }
     }
 
+    private fun showPermissionView() {
+        setContentView(R.layout.activity_main_no_permissions)
+
+        val buttonRequest = findViewById<Button>(R.id.button_request_permissions)
+        buttonRequest.setOnClickListener {
+            ActivityCompat.requestPermissions(
+                this,
+                arrayOf(Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.READ_EXTERNAL_STORAGE),
+                REQUEST_CODE_PERMISSIONS
+            )
+        }
+    }
+
     private fun showConnectedView() {
         setContentView(R.layout.activity_main_connected)
 
@@ -43,4 +70,10 @@ class MainActivity : AppCompatActivity() {
             startActivity(intent)
         }
     }
+
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
+        // The lazy way out...
+        val intent = Intent(this, MainActivity::class.java)
+        startActivity(intent)
+    }
 }

app/src/main/res/layout/activity_main_no_permissions.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:text="@string/main_label_no_permissions"/>
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:id="@+id/button_request_permissions"
+        android:text="@string/main_button_grant_permissions"/>
+
+</LinearLayout>
\ No newline at end of file

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

@@ -5,8 +5,10 @@
     <string name="send_activity_title">Send File</string>
 
     <string name="main_activity_title">@string/app_name</string>
+    <string name="main_label_no_permissions">card10 needs location and storage permissions in order to scan for Bluetooth devices and send files.</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_grant_permissions">Grant Permissions</string>
     <string name="main_button_connect">Connect</string>
     <string name="main_button_send">Send File</string>
 </resources>