Use expanded SearchView in Toolbar instead of an menu option

app/src/main/java/org/koitharu/kotatsu/main/ui/MainActivity.kt

@@ -44,13 +44,12 @@ import org.koitharu.kotatsu.settings.SettingsActivity
 import org.koitharu.kotatsu.settings.onboard.OnboardDialogFragment
 import org.koitharu.kotatsu.tracker.ui.FeedFragment
 import org.koitharu.kotatsu.tracker.work.TrackWorker
-import org.koitharu.kotatsu.utils.ext.getDisplayMessage
-import org.koitharu.kotatsu.utils.ext.navigationItemBackground
-import org.koitharu.kotatsu.utils.ext.resolveDp
+import org.koitharu.kotatsu.utils.ext.*
 
 class MainActivity : BaseActivity<ActivityMainBinding>(),
 	NavigationView.OnNavigationItemSelectedListener,
-	View.OnClickListener, SearchSuggestionListener, MenuItem.OnActionExpandListener {
+	View.OnClickListener, View.OnFocusChangeListener, SearchSuggestionListener,
+	MenuItem.OnActionExpandListener {
 
 	private val viewModel by viewModel<MainViewModel>(mode = LazyThreadSafetyMode.NONE)
 	private val searchSuggestionViewModel by viewModel<SearchSuggestionViewModel>(
@@ -66,15 +65,20 @@ class MainActivity : BaseActivity<ActivityMainBinding>(),
 		setContentView(ActivityMainBinding.inflate(layoutInflater))
 		navHeaderBinding = NavigationHeaderBinding.inflate(layoutInflater)
 		drawerToggle = ActionBarDrawerToggle(
-				this,
-				binding.drawer,
-				binding.toolbar,
-				R.string.open_menu,
-				R.string.close_menu
-			)
+			this,
+			binding.drawer,
+			binding.toolbar,
+			R.string.open_menu,
+			R.string.close_menu
+		)
 		binding.drawer.addDrawerListener(drawerToggle)
 		supportActionBar?.setDisplayHomeAsUpEnabled(true)
 
+		binding.searchView.apply {
+			setOnQueryTextFocusChangeListener(this@MainActivity)
+			searchUi = SearchUI.from(this, this@MainActivity)
+		}
+
 		binding.navigationView.apply {
 			val menuView = findViewById<RecyclerView>(com.google.android.material.R.id.design_navigation_view)
 			navHeaderBinding.root.setOnApplyWindowInsetsListener { v, insets ->
@@ -121,23 +125,19 @@ class MainActivity : BaseActivity<ActivityMainBinding>(),
 	}
 
 	override fun onBackPressed() {
-		if (binding.drawer.isDrawerOpen(binding.navigationView)) {
-			binding.drawer.closeDrawer(binding.navigationView)
-		} else {
-			super.onBackPressed()
+		val fragment = supportFragmentManager.findFragmentByTag(TAG_SEARCH)
+		binding.searchView.setQuery(resources.getString(R.string._empty), false)
+		when {
+			binding.drawer.isDrawerOpen(binding.navigationView) -> binding.drawer.closeDrawer(
+				binding.navigationView)
+			fragment != null -> supportFragmentManager.commit {
+				remove(fragment)
+				setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
+			}
+			else -> super.onBackPressed()
 		}
 	}
 
-	override fun onCreateOptionsMenu(menu: Menu): Boolean {
-		menuInflater.inflate(R.menu.opt_main, menu)
-		searchUi = menu.findItem(R.id.action_search)?.let { menuItem ->
-			onMenuItemActionCollapse(menuItem)
-			menuItem.setOnActionExpandListener(this)
-			SearchUI.from(menuItem, this)
-		}
-		return super.onCreateOptionsMenu(menu)
-	}
-
 	override fun onOptionsItemSelected(item: MenuItem): Boolean {
 		return drawerToggle.onOptionsItemSelected(item) || when (item.itemId) {
 			else -> super.onOptionsItemSelected(item)
@@ -198,6 +198,18 @@ class MainActivity : BaseActivity<ActivityMainBinding>(),
 		}
 	}
 
+	override fun onFocusChange(v: View?, hasFocus: Boolean) {
+		val fragment = supportFragmentManager.findFragmentByTag(TAG_SEARCH)
+		if (v?.id == R.id.searchView && hasFocus) {
+			if (fragment == null) {
+				supportFragmentManager.commit {
+					add(R.id.container, SearchSuggestionFragment.newInstance(), TAG_SEARCH)
+					setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
+				}
+			}
+		}
+	}
+
 	override fun onMangaClick(manga: Manga) {
 		startActivity(DetailsActivity.newIntent(this, manga))
 	}

app/src/main/java/org/koitharu/kotatsu/search/ui/suggestion/SearchUI.kt

@@ -42,10 +42,8 @@ class SearchUI(
 	companion object {
 
 		fun from(
-			menuItem: MenuItem,
+			searchView: SearchView,
 			listener: SearchSuggestionListener,
-		): SearchUI? = (menuItem.actionView as? SearchView)?.let {
-			SearchUI(it, listener)
-		}
+		): SearchUI = SearchUI(searchView, listener)
 	}
 }