[Example] fix issue 225, android permissions

example/android/app/build.gradle

@@ -25,7 +25,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 31
+    compileSdkVersion 33
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -35,7 +35,7 @@ android {
     defaultConfig {
         applicationId "com.boskokg.flutter_blue_plus_example"
         minSdkVersion 19
-        targetSdkVersion 31
+        targetSdkVersion 33
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

example/android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,28 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.boskokg.flutter_blue_plus_example">
+    <!-- Allow Bluetooth -->
+    <uses-feature
+        android:name="android.hardware.bluetooth_le"
+        android:required="true" />
+    <!-- Request legacy Bluetooth permissions on older devices. -->
+    <uses-permission android:name="android.permission.BLUETOOTH"
+        android:maxSdkVersion="30" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"
+        android:maxSdkVersion="30" />
+    <!-- Needed only if your app looks for Bluetooth devices.
+        If your app doesn't use Bluetooth scan results to derive physical
+        location information, you can strongly assert that your app
+        doesn't derive physical location. -->
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+    <!-- Needed only if your app makes the device discoverable to Bluetooth
+         devices. -->
+    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
+    <!-- Needed only if your app communicates with already-paired Bluetooth
+      devices. -->
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <!-- If your application supports a service and can run on Android 10 (API level 29) or Android 11, you must also declare 
+    the ACCESS_BACKGROUND_LOCATION permission to discover Bluetooth devices. -->
+    <!-- <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" /> -->
    <application
         android:label="flutter_blue_plus_example"
         android:name="${applicationName}"

example/lib/main.dart

@@ -8,11 +8,26 @@ import 'dart:math';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_blue_plus/flutter_blue_plus.dart';
+import 'package:permission_handler/permission_handler.dart';
 
 import 'widgets.dart';
 
 void main() {
-  runApp(const FlutterBlueApp());
+
+  if (Platform.isAndroid) {
+    WidgetsFlutterBinding.ensureInitialized();
+    [
+      Permission.location,
+      Permission.storage,
+      Permission.bluetooth,
+      Permission.bluetoothConnect,
+      Permission.bluetoothScan
+    ].request().then((status) {
+      runApp(const FlutterBlueApp());
+    });
+  } else {
+      runApp(const FlutterBlueApp());
+  }
 }
 
 class FlutterBlueApp extends StatelessWidget {

example/pubspec.yaml

@@ -22,6 +22,8 @@ dependencies:
 
   cupertino_icons: ^1.0.2
 
+  permission_handler: ^10.2.0
+
 dev_dependencies:
   flutter_test:
     sdk: flutter