减小动画卡顿概率（但是能力有限呜呜呜）

app/src/main/java/io/legato/kazusa/model/ReadBook.kt

@@ -492,7 +492,7 @@ object ReadBook : CoroutineScope by MainScope() {
      */
     val durPageIndex: Int
         get() {
-            return curTextChapter?.getPageIndexByCharIndex(durChapterPos) ?: durChapterPos
+            return curTextChapter?.getPageIndexByCharIndex(durChapterPos) ?: 0
         }
 
     /**

app/src/main/java/io/legato/kazusa/ui/book/info/BookInfoActivity.kt

@@ -15,6 +15,7 @@ import android.widget.LinearLayout
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.activity.viewModels
 import androidx.core.content.ContextCompat
+import androidx.core.view.doOnPreDraw
 import androidx.lifecycle.lifecycleScope
 import com.google.android.material.transition.platform.MaterialContainerTransform
 import io.legato.kazusa.R
@@ -153,21 +154,19 @@ class BookInfoActivity :
 
     @SuppressLint("PrivateResource")
     override fun onCreate(savedInstanceState: Bundle?) {
-        window.sharedElementEnterTransition = MaterialContainerTransform().apply {
+        postponeEnterTransition()
+        val transform = MaterialContainerTransform().apply {
             addTarget(binding.ivCover)
-            duration = 500
             scrimColor = Color.TRANSPARENT
-            fadeMode = MaterialContainerTransform.FADE_MODE_THROUGH
-        }
-        window.sharedElementReturnTransition = MaterialContainerTransform().apply {
-            addTarget(binding.ivCover)
-            duration = 500
-            scrimColor = Color.TRANSPARENT
-            fadeMode = MaterialContainerTransform.FADE_MODE_THROUGH
         }
+        window.sharedElementEnterTransition = transform
+        window.sharedElementReturnTransition = transform
         window.sharedElementsUseOverlay = false
         super.onCreate(savedInstanceState)
         binding.ivCover.transitionName = intent.getStringExtra("transitionName")
+        binding.ivCover.doOnPreDraw {
+            startPostponedEnterTransition()
+        }
         setSupportActionBar(binding.topBar)
         binding.llRead?.applyNavigationBarMargin()
         binding.btnShelf.text = getString(R.string.remove_from_bookshelf)

app/src/main/java/io/legato/kazusa/ui/book/read/BaseReadBookActivity.kt

@@ -11,6 +11,7 @@ import android.view.WindowInsets
 import android.view.WindowManager
 import androidx.activity.viewModels
 import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.doOnDetach
 import androidx.core.view.isVisible
 import androidx.core.view.updateLayoutParams
 import io.legato.kazusa.R
@@ -84,14 +85,15 @@ abstract class BaseReadBookActivity :
         setOrientation()
         upLayoutInDisplayCutoutMode()
         super.onCreate(savedInstanceState)
-        binding.navigationBar.setOnApplyWindowInsetsListenerCompat { view, windowInsets ->
-            val insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars())
-            view.updateLayoutParams {
-                height = insets.bottom
+        binding.navigationBar.doOnDetach {
+            binding.navigationBar.setOnApplyWindowInsetsListenerCompat { view, windowInsets ->
+                val insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars())
+                view.updateLayoutParams {
+                    height = insets.bottom
+                }
+                windowInsets
             }
-            windowInsets
         }
-
         viewModel.permissionDenialLiveData.observe(this) {
             selectBookFolderResult.launch {
                 mode = HandleFileContract.DIR_SYS

app/src/main/java/io/legato/kazusa/ui/book/read/ReadBookActivity.kt

@@ -7,7 +7,6 @@ import android.content.res.Configuration
 import android.graphics.Color
 import android.net.Uri
 import android.os.Bundle
-import android.os.Looper
 import android.view.Gravity
 import android.view.HapticFeedbackConstants
 import android.view.InputDevice
@@ -20,10 +19,12 @@ import androidx.activity.addCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.widget.PopupMenu
+import androidx.core.view.doOnPreDraw
 import androidx.core.view.get
 import androidx.core.view.size
 import androidx.lifecycle.lifecycleScope
 import com.google.android.material.transition.platform.MaterialContainerTransform
+import com.google.android.material.transition.platform.MaterialSharedAxis
 import com.jaredrummler.android.colorpicker.ColorPickerDialogListener
 import io.legato.kazusa.BuildConfig
 import io.legato.kazusa.R
@@ -130,6 +131,7 @@ import io.legato.kazusa.utils.sysScreenOffTime
 import io.legato.kazusa.utils.throttle
 import io.legato.kazusa.utils.toastOnUi
 import io.legato.kazusa.utils.visible
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
 import kotlinx.coroutines.Job
@@ -261,64 +263,69 @@ class ReadBookActivity : BaseReadBookActivity(),
 
     @SuppressLint("ClickableViewAccessibility")
     override fun onCreate(savedInstanceState: Bundle?) {
-        window.sharedElementEnterTransition = MaterialContainerTransform().apply {
+        postponeEnterTransition()
+        val transform = MaterialContainerTransform().apply {
             addTarget(binding.rootView)
-            duration = 700
             scrimColor = Color.TRANSPARENT
-            fadeMode = MaterialContainerTransform.FADE_MODE_THROUGH
-        }
-        window.sharedElementReturnTransition = MaterialContainerTransform().apply {
-            addTarget(binding.rootView)
-            duration = 700
-            scrimColor = Color.TRANSPARENT
-            fadeMode = MaterialContainerTransform.FADE_MODE_THROUGH
+            duration = 500
         }
+        window.sharedElementEnterTransition = transform
+        window.sharedElementReturnTransition =
+            MaterialSharedAxis(MaterialSharedAxis.X, true).apply { duration = 300 }
         super.onCreate(savedInstanceState)
+
         binding.rootView.transitionName = intent.getStringExtra("transitionName")
-        //binding.cursorLeft.setColorFilter(accentColor)
-        //binding.cursorRight.setColorFilter(accentColor)
         binding.cursorLeft.setOnTouchListener(this)
         binding.cursorRight.setOnTouchListener(this)
-        //window.setBackgroundDrawable(null)
-        upScreenTimeOut()
-        ReadBook.register(this)
-        onBackPressedDispatcher.addCallback(this) {
-            if (isShowingSearchResult) {
-                exitSearchMenu()
-                restoreLastBookProcess()
-                return@addCallback
-            }
-            //拦截返回供恢复阅读进度
-            if (ReadBook.lastBookProgress != null && confirmRestoreProcess != false) {
-                restoreLastBookProcess()
-                return@addCallback
-            }
-            if (BaseReadAloudService.isPlay()) {
-                ReadAloud.pause(this@ReadBookActivity)
-                toastOnUi(R.string.read_aloud_pause)
-                return@addCallback
-            }
-            if (isAutoPage) {
-                autoPageStop()
-                return@addCallback
+
+        binding.rootView.doOnPreDraw { startPostponedEnterTransition() }
+
+        lifecycleScope.launch(Dispatchers.Default) {
+            viewModel.initReadBookConfig(intent)
+            viewModel.initData(intent)
+
+            withContext(Main) {
+                binding.readView.initAfterTransition()
+                justInitData = true
             }
-            if (getPrefBoolean("disableReturnKey") && !menuLayoutIsVisible) {
-                return@addCallback
+        }
+
+        onBackPressedDispatcher.addCallback(this) {
+            when {
+                isShowingSearchResult -> {
+                    exitSearchMenu()
+                    restoreLastBookProcess()
+                }
+
+                ReadBook.lastBookProgress != null && confirmRestoreProcess != false -> {
+                    restoreLastBookProcess()
+                }
+
+                BaseReadAloudService.isPlay() -> {
+                    ReadAloud.pause(this@ReadBookActivity)
+                    toastOnUi(R.string.read_aloud_pause)
+                }
+
+                isAutoPage -> {
+                    autoPageStop()
+                }
+
+                getPrefBoolean("disableReturnKey") && !menuLayoutIsVisible -> {
+
+                }
+
+                else -> finish()
             }
-            finish()
         }
     }
 
     override fun onPostCreate(savedInstanceState: Bundle?) {
         super.onPostCreate(savedInstanceState)
-        viewModel.initReadBookConfig(intent)
-        Looper.myQueue().addIdleHandler {
-            viewModel.initData(intent)
-            false
-        }
-        justInitData = true
+        upScreenTimeOut()
+        ReadBook.register(this)
     }
 
+
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
         viewModel.initData(intent)
@@ -1095,7 +1102,9 @@ class ReadBookActivity : BaseReadBookActivity(),
             "page" -> ReadBook.durPageIndex
             else /* chapter */ -> ReadBook.durChapterIndex
         }
-        binding.readMenu.setSeekPage(progress)
+        if (progress >= 0) {
+            binding.readMenu.setSeekPage(progress)
+        }
     }
 
     /**

app/src/main/java/io/legato/kazusa/ui/book/read/ReadMenu.kt

@@ -243,7 +243,6 @@ class ReadMenu @JvmOverloads constructor(
         } else {
             binding.bottomView.applyNavigationBarPadding()
         }
-
     }
 
     fun reset() {

app/src/main/java/io/legato/kazusa/ui/book/read/page/ReadView.kt

@@ -118,13 +118,19 @@ class ReadView(context: Context, attrs: AttributeSet) :
         nextPage.invisible()
         curPage.markAsMainView()
         if (!isInEditMode) {
-            upBg()
+            //upBg()
             setWillNotDraw(false)
-            upPageAnim()
-            upPageSlopSquare()
+            //upPageAnim()
+            //upPageSlopSquare()
         }
     }
 
+    fun initAfterTransition() {
+        upBg()
+        upPageAnim()
+        upPageSlopSquare()
+    }
+
     private fun setRect9x() {
         tlRect.set(0f, 0f, width * 0.33f, height * 0.33f)
         tcRect.set(width * 0.33f, 0f, width * 0.66f, height * 0.33f)

app/src/main/java/io/legato/kazusa/ui/book/read/page/entities/TextChapter.kt

@@ -228,9 +228,9 @@ data class TextChapter(
         if (pageSize == 0) {
             return -1
         }
-        val bIndex = pages.fastBinarySearchBy(charIndex, 0, pageSize) {
+        val bIndex = pages.takeIf { it.isNotEmpty() }?.fastBinarySearchBy(charIndex, 0, pageSize) {
             it.chapterPosition
-        }
+        } ?: 0
         val index = abs(bIndex + 1) - 1
         // 判断是否已经排版到 charIndex ，没有则返回 -1
         if (!isCompleted && index == pageSize - 1) {

app/src/main/java/io/legato/kazusa/ui/book/read/page/entities/TextPage.kt

@@ -49,7 +49,8 @@ data class TextPage(
     val lines: List<TextLine> get() = textLines
     val lineSize: Int get() = textLines.size
     val charSize: Int get() = text.length.coerceAtLeast(1)
-    val chapterPosition: Int get() = textLines.first().chapterPosition
+    val chapterPosition: Int
+        get() = textLines.firstOrNull()?.chapterPosition ?: 0
     val searchResult = hashSetOf<TextColumn>()
     var isMsgPage: Boolean = false
     var canvasRecorder = CanvasRecorderFactory.create(true)