[Android] Add cancel request method (#7)

* feat: add cancel connect for android

* fix: cancel connect only for android

* fix: clean up the project

* chore: new fvm version

* chore: code style and comments

* chore: bump version to 0.0.8

example_full/lib/domain/app_service.dart

@@ -135,6 +135,10 @@ class AppService extends ChangeNotifier {
 
   Future<void> stopDiscovery() async {
     try {
+      final hasRunning = await hasRunningJobs();
+      if (hasRunning) {
+        await cancelConnect();
+      }
       final result = await _nearbyService.stopDiscovery();
       if (result) {
         updateState(AppState.readyToDiscover);
@@ -170,6 +174,17 @@ class AppService extends ChangeNotifier {
     notifyListeners();
   }
 
+  Future<void> cancelConnect() async {
+    try {
+      await _nearbyService.android?.cancelLastConnectionProcess();
+    } on NearbyServiceBusyException catch (_) {
+      _logBusyException();
+    } catch (e, s) {
+      _log(e, s);
+    }
+    notifyListeners();
+  }
+
   Future<void> stopListeningAll() async {
     await endCommunicationChannel();
     await stopListeningConnectedDevice();

example_full/lib/presentation/components/device_preview.dart

@@ -57,7 +57,7 @@ class DevicePreview extends StatelessWidget {
           ),
     );
 
-    final disconnectButton = device.status.isConnected
+    final trailingButton = device.status.isConnected
         ? TextButton(
             onPressed: () => context.read<AppService>().disconnect(device),
             style: TextButton.styleFrom(
@@ -75,10 +75,10 @@ class DevicePreview extends StatelessWidget {
           name,
           const SizedBox(height: 5),
           id,
-          if (disconnectButton != null)
+          if (trailingButton != null)
             Padding(
               padding: const EdgeInsets.only(top: 10),
-              child: disconnectButton,
+              child: trailingButton,
             ),
         ],
       );
@@ -86,7 +86,9 @@ class DevicePreview extends StatelessWidget {
       return InkWell(
         borderRadius: BorderRadius.circular(12),
         onTap: () {
-          if (!device.status.isConnected) {
+          if (device.status.isConnecting) {
+            context.read<AppService>().cancelConnect();
+          } else if (!device.status.isConnected) {
             context.read<AppService>().connect(device);
           } else {
             context.read<AppService>().startListeningConnectedDevice(device);
@@ -115,7 +117,11 @@ class DevicePreview extends StatelessWidget {
               ),
               Flexible(
                 child: Text(
-                  device.status.isConnected ? 'Tap to chat' : 'Tap to connect',
+                  device.status.isConnected
+                      ? 'Tap to chat'
+                      : device.status.isConnecting
+                          ? 'Tap to cancel connection'
+                          : 'Tap to connect',
                   style: const TextStyle(color: kGreenColor, fontSize: 12),
                   textAlign: TextAlign.center,
                 ),