Refactor WifiDirectManager

- Consolidate the wifi direct transfer cleanup code in WDM
- Cleanup now performed by WDM, initiated by the destroyWifiDirectManager() call in onDestroy()

app/src/main/java/org/kiwix/kiwixmobile/zim_manager/local_file_transfer/LocalFileTransferActivity.java

@@ -133,11 +133,11 @@ public class LocalFileTransferActivity extends AppCompatActivity implements
     actionBar.setNavigationOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View v) {
-        wifiDirectManager.closeLocalFileTransferActivity();
+        finish();
       }
     });
 
-    wifiDirectManager.initialiseWifiDirectManager(alertDialogShower);
+    wifiDirectManager.createWifiDirectManager(alertDialogShower);
 
     listViewPeerDevices.setAdapter(
         new WifiPeerListAdapter(this, R.layout.row_peer_device, peerDevices));
@@ -269,7 +269,7 @@ public class LocalFileTransferActivity extends AppCompatActivity implements
     if (clientAddress == null) {
       // null is returned only in case of a failed handshake
       showToast(this, R.string.device_not_cooperating, Toast.LENGTH_LONG);
-      wifiDirectManager.closeLocalFileTransferActivity();
+      finish();
       return;
     }
 
@@ -440,7 +440,7 @@ public class LocalFileTransferActivity extends AppCompatActivity implements
           Log.e(TAG, "Location permission not granted");
 
           showToast(this, R.string.permission_refused_location, Toast.LENGTH_LONG);
-          wifiDirectManager.closeLocalFileTransferActivity();
+          finish();
           break;
         }
 
@@ -448,7 +448,7 @@ public class LocalFileTransferActivity extends AppCompatActivity implements
           Log.e(TAG, "Storage write permission not granted");
 
           showToast(this, R.string.permission_refused_storage, Toast.LENGTH_LONG);
-          wifiDirectManager.closeLocalFileTransferActivity();
+          finish();
           break;
         }
 
@@ -574,6 +574,6 @@ public class LocalFileTransferActivity extends AppCompatActivity implements
 
   @Override protected void onDestroy() {
     super.onDestroy();
-    cancelAsyncTasks();
+    wifiDirectManager.destroyWifiDirectManager();
   }
 }

app/src/main/java/org/kiwix/kiwixmobile/zim_manager/local_file_transfer/ReceiverDeviceAsyncTask.java

@@ -119,6 +119,6 @@ class ReceiverDeviceAsyncTask extends AsyncTask<Void, Integer, Boolean> {
           Toast.LENGTH_LONG);
     }
 
-    (localFileTransferActivity).wifiDirectManager.closeLocalFileTransferActivity();
+    localFileTransferActivity.finish();
   }
 }

app/src/main/java/org/kiwix/kiwixmobile/zim_manager/local_file_transfer/WifiDirectManager.java

@@ -57,7 +57,7 @@ public class WifiDirectManager implements WifiP2pManager.ChannelListener, WifiP2
   }
 
   /* Initialisations for using the WiFi P2P API */
-  public void initialiseWifiDirectManager(@NonNull AlertDialogShower alertDialogShower) {
+  public void createWifiDirectManager(@NonNull AlertDialogShower alertDialogShower) {
     this.alertDialogShower = alertDialogShower;
 
     manager = (WifiP2pManager) activity.getSystemService(Context.WIFI_P2P_SERVICE);
@@ -213,14 +213,14 @@ public class WifiDirectManager implements WifiP2pManager.ChannelListener, WifiP2
   }
 
   // TODO: Shift async tasks to WDM and handle cleanup from here itself
-  public void closeLocalFileTransferActivity() {
+  public void destroyWifiDirectManager() {
     activity.cancelAsyncTasks();
 
-    activity.isFileSender = false;
-    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
-      channel.close();
-    }
+    if (!activity.isFileSender) {
       disconnect();
+    } else {
+      closeChannel();
+    }
   }
 
   public void disconnect() {
@@ -229,19 +229,21 @@ public class WifiDirectManager implements WifiP2pManager.ChannelListener, WifiP2
       @Override
       public void onFailure(int reasonCode) {
         Log.d(TAG, "Disconnect failed. Reason: " + reasonCode);
-        closeActivity();
+        closeChannel();
       }
 
       @Override
       public void onSuccess() {
         Log.d(TAG, "Disconnect successful");
-        closeActivity();
+        closeChannel();
       }
     });
   }
 
-  public void closeActivity() {
-    activity.finish();
+  public void closeChannel() {
+    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
+      channel.close();
+    }
   }