Flutter - Exact place to put permissions in AndroidManifest file(s) for flutter_reactive_ble library

I have problems to manage how to run sample / example codes for flutter_reactive_ble library in Flutter mobile app for Android. I have tried few examples, with no luck.

I found that the main reason for errors is lack of provided permissions for Bluetooth. Docs of flutter_reactive_ble library show that we need to put two parts of code to Android Manifest file(s)...

One:

<uses-permission android:name="android.permission.BLUETOOTH_SCAN" android:usesPermissionFlags="neverForLocation" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" android:maxSdkVersion="30" />

Two:

<uses-permission android:name="android.permission.BLUETOOTH_SCAN" 
                     tools:remove="android:usesPermissionFlags"
                     tools:targetApi="s" />

Here are docs for this lib: https://pub.dev/packages/flutter_reactive_ble

I don't know where to place them, especially the second part. Without them provided codes won't work.

Another problem is that in Flutter app there are three Manifest files, in three different dirs:

• main
• profile
• debug

Those files are different, which should I edit?

--

Whole Manifest file (from main dir):

<manifest xmlns:android="http://schemas.android.com/apk/res/android">

    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" tools:remove="android:usesPermissionFlags" tools:targetApi="s" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" android:maxSdkVersion="30" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" android:maxSdkVersion="30" />

    <application
        android:label="fl_ble_3"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that, this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

The Android Manifest's location is inside [Project_Root]\android\app\src\main\AndroidManifest.xml And your manifest would be look like this:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.blockchaincommodities.hippo_wallet"
    xmlns:tools="http://schemas.android.com/tools">
   
   <uses-permission android:name="android.permission.BLUETOOTH_SCAN" android:usesPermissionFlags="neverForLocation" />
   <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" android:maxSdkVersion="30" />
   <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" android:maxSdkVersion="30" />


   <application>
   ...
   <\application>
<\manifest>

As it's mentioned in the document, If you use BLUETOOTH_SCAN to determine location, you have to modify the permission and your manifest would be looked like this alternatively:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.blockchaincommodities.hippo_wallet"
    xmlns:tools="http://schemas.android.com/tools">
   
   <uses-permission android:name="android.permission.BLUETOOTH_SCAN" 
                     tools:remove="android:usesPermissionFlags"
                     tools:targetApi="s" />
   <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" android:maxSdkVersion="30" />
   <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" android:maxSdkVersion="30" />


   <application>
   ...
   <\application>
<\manifest>

Since these permission are critical, You have to ask the user to accept the permissions first. In flutter, you can handle permissions by libraries like pemission_handler. Add this library to your project and add these lines before scanning for devices.

PermissionStatus locationPermission = await Permission.location.request();
PermissionStatus bleScan = await Permission.bluetoothScan.request();
PermissionStatus bleConnect = await Permission.bluetoothConnect.request();