Fix/show and hide bottom and top panels after search

app/src/main/java/rees46/demo_android/app/navigation/AppNavigator.kt

@@ -4,6 +4,7 @@ import android.os.Bundle
 import androidx.annotation.IdRes
 import androidx.core.os.bundleOf
 import androidx.navigation.NavController
+import androidx.navigation.NavController.OnDestinationChangedListener
 import com.rees46.demo_android.navigation.Destination
 import com.rees46.demo_android.navigation.Navigator
 import com.rees46.demo_android.navigation.ProductDetails
@@ -41,9 +42,16 @@ class AppNavigator(private val navController: NavController) : Navigator {
         navController.popBackStack()
     }
 
-    override fun getCurrentDestination() : Int? =
+    override fun getCurrentDestinationId() : Int? =
         navController.currentDestination?.id
 
+    override fun getPreviousDestinationId() : Int? =
+        navController.previousBackStackEntry?.destination?.id
+
+    override fun addOnDestinationChangedListener(listener: OnDestinationChangedListener) {
+        navController.addOnDestinationChangedListener(listener)
+    }
+
     private fun navigate(@IdRes resId: Int, args: Bundle?) {
         navController.navigate(
             resId = resId,

app/src/main/java/rees46/demo_android/app/presentation/MainActivity.kt

@@ -34,6 +34,7 @@ class MainActivity : AppCompatActivity(), LifecycleOwner {
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.getRoot())
 
+        setupNavigator()
         setupTopAppBar()
         setupBottomNavigationView()
         setupPopBackStack()
@@ -58,16 +59,33 @@ class MainActivity : AppCompatActivity(), LifecycleOwner {
     }
 
     private fun switchBottomTab(id: Int) {
-        if(navigator.getCurrentDestination() == id) return
+        if(navigator.getCurrentDestinationId() == id) return
 
         navigator.navigate(id)
     }
 
+    private fun setupNavigator() {
+        navigator.addOnDestinationChangedListener { _, destination, _ ->
+            if(navigator.getPreviousDestinationId() == R.id.searchFragment) {
+                showBars(true)
+                return@addOnDestinationChangedListener
+            }
+
+            if(destination.id == R.id.searchFragment) {
+                showBars(false)
+            }
+        }
+    }
+
     private fun setupPopBackStack() {
         onBackPressedDispatcher.addCallback(
             owner = this,
             onBackPressedCallback = object : OnBackPressedCallback(true) {
                 override fun handleOnBackPressed() {
+                    if(navigator.getCurrentDestinationId() == R.id.searchFragment) {
+                        showBars(true)
+                    }
+
                     navigator.popBackStack()
 
                     changeSelectedBottomItem()
@@ -78,7 +96,7 @@ class MainActivity : AppCompatActivity(), LifecycleOwner {
 
     private fun changeSelectedBottomItem() {
         with(binding.bottomNavigation) {
-            when (navigator.getCurrentDestination()) {
+            when (navigator.getCurrentDestinationId()) {
                 R.id.homeFragment -> selectedItemId = R.id.home
                 R.id.categoryFragment -> selectedItemId = R.id.category
                 R.id.cartFragment -> selectedItemId = R.id.cart
@@ -101,8 +119,6 @@ class MainActivity : AppCompatActivity(), LifecycleOwner {
                         true
                     }
                     R.id.menu_top_app_search -> {
-                        supportActionBar?.hide()
-                        binding.bottomNavigation.isVisible = false
                         navigator.navigate(R.id.searchFragment)
                         true
                     }
@@ -111,4 +127,15 @@ class MainActivity : AppCompatActivity(), LifecycleOwner {
             }
         })
     }
+
+    private fun showBars(isShow: Boolean) {
+        if(isShow) {
+            supportActionBar?.show()
+        }
+        else {
+            supportActionBar?.hide()
+        }
+
+        binding.bottomNavigation.isVisible = isShow
+    }
 }

navigation/src/main/java/com/rees46/demo_android/navigation/Navigator.kt

@@ -1,10 +1,15 @@
 package com.rees46.demo_android.navigation
 
+import androidx.navigation.NavController
+
 interface Navigator {
     fun navigate(destination: Destination)
 
     fun navigate(id: Int)
 
     fun popBackStack()
-    fun getCurrentDestination() : Int?
+    fun getCurrentDestinationId() : Int?
+    fun getPreviousDestinationId() : Int?
+
+    fun addOnDestinationChangedListener(listener: NavController.OnDestinationChangedListener)
 }