Hide bottom navigation for non main destinations

app/src/main/java/de/christinecoenen/code/zapp/app/main/MainActivity.kt

@@ -4,7 +4,9 @@ import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.isVisible
 import androidx.navigation.NavController
+import androidx.navigation.NavDestination
 import androidx.navigation.fragment.NavHostFragment
 import androidx.navigation.ui.*
 import androidx.preference.PreferenceManager
@@ -40,11 +42,35 @@ class MainActivity : AppCompatActivity() {
 		setSupportActionBar(binding.toolbar)
 		setupActionBarWithNavController(navController, appBarConfiguration)
 
+		navController.addOnDestinationChangedListener(::onDestinationChanged)
+
 		binding.bottomNavigation.setupWithNavController(navController)
 
 		PreferenceManager.setDefaultValues(application, R.xml.preferences, false)
 	}
 
+	@Suppress("UNUSED_PARAMETER")
+	private fun onDestinationChanged(
+		controller: NavController,
+		destination: NavDestination,
+		arguments: Bundle?
+	) {
+		val isMainDestination = arguments?.getBoolean("is_main_destination", false) == true
+
+		// hide bottom navigation for non main destinations
+		binding.bottomNavigation.isVisible = isMainDestination
+
+		// hide toolbar logo for non main destinations
+		if (isMainDestination) {
+			binding.toolbar.setLogo(R.drawable.ic_zapp_tv_small)
+			binding.toolbar.titleMarginStart =
+				resources.getDimensionPixelSize(R.dimen.toolbar_logo_margin)
+		} else {
+			binding.toolbar.logo = null
+			binding.toolbar.titleMarginStart = 0
+		}
+	}
+
 	override fun onDestroy() {
 		super.onDestroy()
 		_binding = null

app/src/main/res/layout/activity_main.xml

@@ -27,8 +27,7 @@
 				android:layout_width="match_parent"
 				android:layout_height="?attr/actionBarSize"
 				android:elevation="8dp"
-				app:logo="@drawable/ic_zapp_tv_small"
-				app:titleMarginStart="32dp" />
+				app:logo="@drawable/ic_zapp_tv_small" />
 
 		</com.google.android.material.appbar.AppBarLayout>
 

app/src/main/res/navigation/nav_graph.xml

@@ -9,17 +9,32 @@
 		android:id="@+id/channelListFragment"
 		android:name="de.christinecoenen.code.zapp.app.livestream.ui.list.ChannelListFragment"
 		android:label="@string/app_name"
-		tools:layout="@layout/fragment_channel_list" />
+		tools:layout="@layout/fragment_channel_list">
+		<argument
+			android:name="is_main_destination"
+			android:defaultValue="true"
+			app:argType="boolean" />
+	</fragment>
 	<fragment
 		android:id="@+id/mediathekListFragment"
 		android:name="de.christinecoenen.code.zapp.app.mediathek.ui.list.MediathekListFragment"
 		android:label="@string/app_name"
-		tools:layout="@layout/fragment_mediathek_list" />
+		tools:layout="@layout/fragment_mediathek_list">
+		<argument
+			android:name="is_main_destination"
+			android:defaultValue="true"
+			app:argType="boolean" />
+	</fragment>
 	<fragment
 		android:id="@+id/downloadsFragment"
 		android:name="de.christinecoenen.code.zapp.app.downloads.ui.list.DownloadsFragment"
 		android:label="@string/app_name"
-		tools:layout="@layout/downloads_fragment" />
+		tools:layout="@layout/downloads_fragment">
+		<argument
+			android:name="is_main_destination"
+			android:defaultValue="true"
+			app:argType="boolean" />
+	</fragment>
 	<fragment
 		android:id="@+id/settingsFragment"
 		android:name="de.christinecoenen.code.zapp.app.settings.ui.SettingsFragment"

app/src/main/res/values/dimens.xml

@@ -3,6 +3,8 @@
 	<dimen name="activity_horizontal_margin">16dp</dimen>
 	<dimen name="activity_vertical_margin">16dp</dimen>
 
+	<dimen name="toolbar_logo_margin">32dp</dimen>
+
 	<dimen name="view_program_info_subtitle_margin_bottom">4dp</dimen>
 
 	<dimen name="activity_channel_selection_item_width">120dip</dimen>