Fixed viewer flickering

Added moving with volume button
Added nomedia
Added help link to error snackbar

app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt

@@ -18,22 +18,25 @@
 
 package xyz.quaver.pupil.adapters
 
+import android.graphics.drawable.Drawable
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.ImageView
 import androidx.recyclerview.widget.RecyclerView
 import com.bumptech.glide.RequestManager
+import com.bumptech.glide.load.DataSource
 import com.bumptech.glide.load.engine.DiskCacheStrategy
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
+import com.bumptech.glide.load.engine.GlideException
+import com.bumptech.glide.request.RequestListener
+import com.bumptech.glide.request.target.Target
+import xyz.quaver.pupil.BuildConfig
 import xyz.quaver.pupil.R
 
 class ReaderAdapter(private val glide: RequestManager, private val images: List<String>) : RecyclerView.Adapter<ReaderAdapter.ViewHolder>() {
 
     var isFullScreen = false
+    private var prev : Drawable? = null
 
     class ViewHolder(val view: View) : RecyclerView.ViewHolder(view)
 
@@ -46,19 +49,41 @@ class ReaderAdapter(private val glide: RequestManager, private val images: List<
     }
 
     override fun onBindViewHolder(holder: ViewHolder, position: Int) {
-        runBlocking {
-            CoroutineScope(Dispatchers.Default).launch {
-                val image = glide
-                    .load(images[position])
-                    .diskCacheStrategy(DiskCacheStrategy.NONE)
-                    .skipMemoryCache(true)
-                    .error(R.drawable.image_broken_variant)
-                    .submit()
-                    .get()
+        holder.view as ImageView
 
-                (holder.view as ImageView).setImageDrawable(image)
-            }.join()
-        }
+        glide
+            .load(images[position])
+            .dontTransform()
+            .diskCacheStrategy(DiskCacheStrategy.NONE)
+            .skipMemoryCache(true)
+            .error(R.drawable.image_broken_variant)
+            .apply {
+                if (BuildConfig.CENSOR)
+                    override(5, 8)
+                if (isFullScreen)
+                    placeholder(prev)
+            }
+            .listener(object: RequestListener<Drawable> {
+                override fun onLoadFailed(
+                    e: GlideException?,
+                    model: Any?,
+                    target: Target<Drawable>?,
+                    isFirstResource: Boolean
+                ) = false
+
+                override fun onResourceReady(
+                    resource: Drawable?,
+                    model: Any?,
+                    target: Target<Drawable>?,
+                    dataSource: DataSource?,
+                    isFirstResource: Boolean
+                ): Boolean {
+                    prev = resource?.constantState?.newDrawable()?.mutate()
+
+                    return false
+                }
+            })
+            .into(holder.view)
     }
 
     override fun getItemCount() = images.size