Remove deprecated codes in MainActivity.kt

V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/MainActivity.kt

@@ -22,6 +22,7 @@ import androidx.appcompat.app.ActionBarDrawerToggle
 import androidx.recyclerview.widget.ItemTouchHelper
 import android.util.Log
 import android.widget.Toast
+import androidx.activity.OnBackPressedCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.activity.viewModels
 import androidx.appcompat.app.AlertDialog
@@ -117,6 +118,17 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
                         toast(R.string.toast_permission_denied)
                 }
         }
+
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (binding.drawerLayout.isDrawerOpen(GravityCompat.START)) {
+                    binding.drawerLayout.closeDrawer(GravityCompat.START)
+                } else {
+                    //super.onBackPressed()
+                    onBackPressedDispatcher.onBackPressed()
+                }
+            }
+        })
     }
 
     private fun setupViewModel() {
@@ -656,16 +668,6 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
         }
     }
 
-    @Deprecated("Deprecated in Java")
-    override fun onBackPressed() {
-        if (binding.drawerLayout.isDrawerOpen(GravityCompat.START)) {
-            binding.drawerLayout.closeDrawer(GravityCompat.START)
-        } else {
-            //super.onBackPressed()
-            onBackPressedDispatcher.onBackPressed()
-        }
-    }
-
     override fun onNavigationItemSelected(item: MenuItem): Boolean {
         // Handle navigation view item clicks here.
         when (item.itemId) {