Refactor star icon handling

Extracted all favorite handling to two functions. Makes it a little bit more readable.

androidApp/src/main/java/bou/amine/apps/readerforselfossv2/android/ReaderActivity.kt

@@ -37,22 +37,6 @@ class ReaderActivity :
     private val repository: Repository by instance()
     private val appSettingsService: AppSettingsService by instance()
 
-    private fun showMenuItem(willAddToFavorite: Boolean) {
-        if (willAddToFavorite) {
-            toolbarMenu.findItem(R.id.star).icon?.setTint(Color.WHITE)
-        } else {
-            toolbarMenu.findItem(R.id.star).icon?.setTint(Color.RED)
-        }
-    }
-
-    private fun canFavorite() {
-        showMenuItem(true)
-    }
-
-    private fun canRemoveFromFavorite() {
-        showMenuItem(false)
-    }
-
     @Suppress("detekt:SwallowedException")
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -73,14 +57,21 @@ class ReaderActivity :
             finish()
         }
 
-        try {
+        readItem()
-            readItem(allItems[currentItem])
-        } catch (e: IndexOutOfBoundsException) {
-            finish()
-        }
 
         binding.pager.adapter = ScreenSlidePagerAdapter(this)
         binding.pager.setCurrentItem(currentItem, false)
+
+        binding.pager.registerOnPageChangeCallback(
+            object : ViewPager2.OnPageChangeCallback() {
+                override fun onPageSelected(position: Int) {
+                    super.onPageSelected(position)
+                    currentItem = position
+                    updateStarIcon()
+                    readItem()
+                }
+            },
+        )
     }
 
     override fun onResume() {
@@ -89,14 +80,20 @@ class ReaderActivity :
         binding.indicator.setViewPager(binding.pager)
     }
 
-    private fun readItem(item: SelfossModel.Item) {
+    private fun readItem() {
-        if (appSettingsService.isMarkOnScrollEnabled() && !appSettingsService.getPublicAccess()) {
+        val item = allItems.getOrNull(currentItem)
+        if (appSettingsService.isMarkOnScrollEnabled() && !appSettingsService.getPublicAccess() && item != null) {
             CoroutineScope(Dispatchers.IO).launch {
                 repository.markAsRead(item)
             }
         }
     }
 
+    private fun updateStarIcon() {
+        val isStarred = allItems.getOrNull(currentItem)?.starred ?: false
+        toolbarMenu.findItem(R.id.star)?.icon?.setTint(if (isStarred) Color.RED else Color.WHITE)
+    }
+
     override fun onSaveInstanceState(oldInstanceState: Bundle) {
         super.onSaveInstanceState(oldInstanceState)
         oldInstanceState.clear()
@@ -141,8 +138,7 @@ class ReaderActivity :
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
-        val inflater = menuInflater
+        menuInflater.inflate(R.menu.reader_menu, menu)
-        inflater.inflate(R.menu.reader_menu, menu)
         toolbarMenu = menu
 
         alignmentMenu()
@@ -150,72 +146,39 @@ class ReaderActivity :
         if (appSettingsService.getPublicAccess()) {
             menu.removeItem(R.id.star)
         } else {
-            if (allItems.isNotEmpty() && allItems[currentItem].starred) {
+            updateStarIcon()
-                canRemoveFromFavorite()
-            } else {
-                canFavorite()
-            }
-
-            binding.pager.registerOnPageChangeCallback(
-                object : ViewPager2.OnPageChangeCallback() {
-                    override fun onPageSelected(position: Int) {
-                        super.onPageSelected(position)
-
-                        if (!allItems.isNullOrEmpty() && allItems.size >= position) {
-                            if (allItems[position].starred) {
-                                canRemoveFromFavorite()
-                            } else {
-                                canFavorite()
-                            }
-                            readItem(allItems[position])
-                        }
-                    }
-                },
-            )
         }
 
         return true
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
-        fun afterSave() {
-            allItems[binding.pager.currentItem] =
-                allItems[binding.pager.currentItem].toggleStar()
-            canRemoveFromFavorite()
-        }
-
-        fun afterUnsave() {
-            allItems[binding.pager.currentItem] = allItems[binding.pager.currentItem].toggleStar()
-            canFavorite()
-        }
-
         when (item.itemId) {
-            android.R.id.home -> {
+            android.R.id.home -> onBackPressedDispatcher.onBackPressed()
-                onBackPressedDispatcher.onBackPressed()
+            R.id.star -> toggleFavorite()
-                return true
-            }
-
-            R.id.star -> {
-                if (allItems[binding.pager.currentItem].starred) {
-                    CoroutineScope(Dispatchers.IO).launch {
-                        repository.unstarr(allItems[binding.pager.currentItem])
-                    }
-                    afterUnsave()
-                } else {
-                    CoroutineScope(Dispatchers.IO).launch {
-                        repository.starr(allItems[binding.pager.currentItem])
-                    }
-                    afterSave()
-                }
-            }
-
             R.id.align_left -> switchAlignmentSetting(AppSettingsService.ALIGN_LEFT)
-
             R.id.align_justify -> switchAlignmentSetting(AppSettingsService.JUSTIFY)
         }
         return super.onOptionsItemSelected(item)
     }
 
+    private fun toggleFavorite() {
+        val item = allItems.getOrNull(currentItem) ?: return
+
+        val starred = item.starred
+
+        CoroutineScope(Dispatchers.IO).launch {
+            if (starred) {
+                repository.unstarr(item)
+            } else {
+                repository.starr(item)
+            }
+        }
+
+        item.toggleStar()
+        updateStarIcon()
+    }
+
     private fun switchAlignmentSetting(alignment: Int) {
         appSettingsService.changeAllignment(alignment)
         alignmentMenu()