Use of dynamic permissions for Flutter development

<manifest xmlns:andro
    package=".kill_attendance">
        <!-- ApplyAndroidPermissions-->
    <!--Network access-->
    <uses-permission android:name="" />
    <uses-permission android:name=".ACCESS_NETWORK_STATE" />
    <uses-permission android:name=".ACCESS_WIFI_STATE" />

    <!-- Permissions options for the `contacts` group -->
    <uses-permission android:name=".READ_CONTACTS" />
    <uses-permission android:name=".WRITE_CONTACTS" />
    <uses-permission android:name=".GET_ACCOUNTS" />

    <!-- Permissions options for the `storage` group -->
    <uses-permission android:name=".READ_EXTERNAL_STORAGE" />
    <uses-permission android:name=".WRITE_EXTERNAL_STORAGE" />

    <!-- Permissions options for the `camera` group -->
    <uses-permission android:name="" />

    <!-- Permissions options for the `location` group -->
    <uses-permission android:name=".ACCESS_FINE_LOCATION" />
    <uses-permission android:name=".ACCESS_COARSE_LOCATION" />
    <uses-permission android:name=".ACCESS_BACKGROUND_LOCATION" />

    <!-- Permissions options for the `microphone` or `speech` group -->
    <uses-permission android:name=".RECORD_AUDIO" />
         <!-- appname,icon -->
    <application
        android:name=""
        android:label="Application Name"
        android:icon="@mipmap/icon">
        <activity
            android:name=".MainActivity"
            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">
            <!-- This keeps the window background of the activity showing
                 until Flutter renders its first frame. It can be removed if
                 there is no splash screen (such as the default splash screen
                 defined in @style/LaunchTheme). -->
            <meta-data
                android:name=""
                android:value="true" />
            <intent-filter>
                <action android:name=""/>
                <category android:name=""/>
            </intent-filter>
        </activity>
    </application>
</manifest>

await Map<PermissionGroup, PermissionStatus> map= PermissionHandler().requestPermissions([ Permission list])

PermissionStatus contactsPermStatus = await PermissionHandler().checkPermissionStatus();

  ///Request permission  void _requestPermission() async {
    debugPrint("Enter the splash screen page");
    // Application permission    // PermissionStatus storageStatus ;
    PermissionStatus cameraStatus;

     await PermissionHandler().requestPermissions(
          [ ]).then((value) {
             debugPrint("Return:$value");
            // storageStatus=value[];
            cameraStatus=value[];
          });
    debugPrint("Request permissions and obtain permissions: $cameraStatus");

    //Calculate permissions    if (cameraStatus == ) {
      debugPrint("Check permission: The user agrees");
      //The user has agreed (used &&)      ///All permissions are applied to initialize the flash screen successfully      _initSplash();
    } else if ( cameraStatus == ) {
      debugPrint("Check permissions: Any set of permissions are denied by the user");
      //The user rejected (using ||)      ///There is any set of permissions denied by the user      //Splicing prompt permission text      StringBuffer sb = new StringBuffer();
      (cameraStatus ==  ? "camera," : "");
      String tip = ((), ",");

      (
          context,
          ConfirmDialog(
            "You rejected the necessary permissions for the application:\n[$tip], did you reapply?",
            canBackDismiss: false,
            confirmCallback: () => _requestPermission(),
            cancelCallback: () => (),
          ));
    } else if (  cameraStatus == ) {
      debugPrint("Check permissions: Permanently denied with permissions");
      //Permission to permanently refuse (using ||)      ///If you have any permissions, you will no longer prompt      //Splicing prompt permission text      StringBuffer sb = new StringBuffer();
      (cameraStatus ==  ? "camera," : "");
      String tip = ((), ",");

      (
          context,
          ConfirmDialog(
            "You have disabled the necessary permissions for the application:\n[$tip], please go to the settings to allow it?",
            canBackDismiss: false,
            confirmText: "Go to Settings",
            confirmCallback: () async {
              await PermissionHandler().openAppSettings(); //Open the settings page              ();
            },
            cancelCallback: () => (),
          ));
    }

  }

await [Permission list].request();   //You can use then, use permissions to get the status

  ///Request permission  void _requestPermission() async {
    debugPrint("Enter the splash screen page");
    // Application permission    // PermissionStatus cameraStatus;

    await [].request();
    // .then((value){
      //Set the result after application        // cameraStatus=value[];
      // });
    // Or call directly:    debugPrint("Request permissions and obtain permissions");
    if(await ){

    }
    
    //Calculate permissions    if (await ) {
      debugPrint("Check permission: The user agrees");
      //The user has agreed (used &&)      ///All permissions are applied to initialize the flash screen successfully      _initSplash();
    } else if ( await ) {
      debugPrint("Check permissions: Any set of permissions are denied by the user");
      //The user rejected (using ||)      ///There is any set of permissions denied by the user      //Splicing prompt permission text      StringBuffer sb = new StringBuffer();
      (await ? "camera," : "");
      String tip = ((), ",");

      (
          context,
          ConfirmDialog(
            "You rejected the necessary permissions for the application:\n[$tip], did you reapply?",
            canBackDismiss: false,
            confirmCallback: () => _requestPermission(),
            cancelCallback: () => (),
          ));
    } else if ( await ) {
      debugPrint("Check permissions: Permanently denied with permissions");
      //Permission to permanently refuse (using ||)      ///If you have any permissions, you will no longer prompt      //Splicing prompt permission text      StringBuffer sb = new StringBuffer();
      ( await  ? "camera," : "");
      String tip = ((), ",");

      (
          context,
          ConfirmDialog(
            "You have disabled the necessary permissions for the application:\n[$tip], please go to the settings to allow it?",
            canBackDismiss: false,
            confirmText: "Go to Settings",
            confirmCallback: () async {
              await openAppSettings(); //Open the settings page              ();
            },
            cancelCallback: () => (),
          ));
    }

  }