Fix reader toolbar alpha applied to other components outside its activity (#5483)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -12,7 +12,7 @@ import android.graphics.Color
 import android.graphics.ColorMatrix
 import android.graphics.ColorMatrixColorFilter
 import android.graphics.Paint
-import android.graphics.drawable.ColorDrawable
+import android.graphics.PorterDuff
 import android.os.Build
 import android.os.Bundle
 import android.view.KeyEvent
@@ -25,6 +25,7 @@ import android.view.animation.Animation
 import android.view.animation.AnimationUtils
 import android.widget.SeekBar
 import android.widget.Toast
+import androidx.core.graphics.ColorUtils
 import androidx.core.view.WindowCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
@@ -32,6 +33,7 @@ import androidx.core.view.isVisible
 import androidx.lifecycle.lifecycleScope
 import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
 import com.google.android.material.shape.MaterialShapeDrawable
+import com.mikepenz.aboutlibraries.util.getThemeColor
 import dev.chrisbanes.insetter.applyInsetter
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.models.Chapter
@@ -352,21 +354,22 @@ class ReaderActivity : BaseRxActivity<ReaderActivityBinding, ReaderPresenter>()
         initBottomShortcuts()
 
         val alpha = if (preferences.isDarkMode()) 230 else 242 // 90% dark 95% light
+        val toolbarColor = ColorUtils.setAlphaComponent(getThemeColor(R.attr.colorToolbar), alpha)
         listOf(
             binding.toolbarBottom,
             binding.leftChapter,
             binding.readerSeekbar,
             binding.rightChapter
         ).forEach {
-            it.background.alpha = alpha
+            it.backgroundTintMode = PorterDuff.Mode.DST_IN
+            it.backgroundTintList = ColorStateList.valueOf(toolbarColor)
         }
 
-        val systemBarsColor = (binding.toolbarBottom.background as ColorDrawable).color
-        window.statusBarColor = systemBarsColor
+        window.statusBarColor = toolbarColor
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
-            window.navigationBarColor = systemBarsColor
+            window.navigationBarColor = toolbarColor
         }
-        (binding.toolbar.background as MaterialShapeDrawable).fillColor = ColorStateList.valueOf(systemBarsColor)
+        (binding.toolbar.background as MaterialShapeDrawable).fillColor = ColorStateList.valueOf(toolbarColor)
 
         // Set initial visibility
         setMenuVisibility(menuVisible)