Move file reads in RV adapters to a background dispatcher

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/main/java/dev/msfjarvis/aps/ui/adapters/PasswordItemRecyclerAdapter.kt

@@ -17,12 +17,16 @@ import dev.msfjarvis.aps.R
 import dev.msfjarvis.aps.data.password.PasswordItem
 import dev.msfjarvis.aps.util.viewmodel.SearchableRepositoryAdapter
 import dev.msfjarvis.aps.util.viewmodel.stableId
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 
-open class PasswordItemRecyclerAdapter :
+open class PasswordItemRecyclerAdapter(coroutineScope: CoroutineScope) :
   SearchableRepositoryAdapter<PasswordItemRecyclerAdapter.PasswordItemViewHolder>(
     R.layout.password_row_layout,
     ::PasswordItemViewHolder,
-    PasswordItemViewHolder::bind
+    coroutineScope,
+    PasswordItemViewHolder::bind,
   ) {
 
   fun makeSelectable(recyclerView: RecyclerView) {
@@ -48,7 +52,7 @@ open class PasswordItemRecyclerAdapter :
     private val folderIndicator: AppCompatImageView = itemView.findViewById(R.id.folder_indicator)
     lateinit var itemDetails: ItemDetailsLookup.ItemDetails<String>
 
-    fun bind(item: PasswordItem) {
+    suspend fun bind(item: PasswordItem) {
       val parentPath = item.fullPathToParent.replace("(^/)|(/$)".toRegex(), "")
       val source =
         if (parentPath.isNotEmpty()) {
@@ -62,7 +66,9 @@ open class PasswordItemRecyclerAdapter :
       if (item.type == PasswordItem.TYPE_CATEGORY) {
         folderIndicator.visibility = View.VISIBLE
         val count =
+          withContext(Dispatchers.IO) {
             item.file.listFiles { path -> path.isDirectory || path.extension == "gpg" }?.size ?: 0
+          }
         childCount.visibility = if (count > 0) View.VISIBLE else View.GONE
         childCount.text = "$count"
       } else {

app/src/main/java/dev/msfjarvis/aps/ui/autofill/AutofillFilterActivity.kt

@@ -22,6 +22,7 @@ import androidx.core.text.buildSpannedString
 import androidx.core.text.underline
 import androidx.core.widget.addTextChangedListener
 import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.github.ajalt.timberkt.e
 import com.github.androidpasswordstore.autofillparser.FormOrigin
@@ -132,8 +133,11 @@ class AutofillFilterView : AppCompatActivity() {
     with(binding) {
       rvPassword.apply {
         adapter =
-          SearchableRepositoryAdapter(R.layout.oreo_autofill_filter_row, ::PasswordViewHolder) {
-            item ->
+          SearchableRepositoryAdapter(
+              R.layout.oreo_autofill_filter_row,
+              ::PasswordViewHolder,
+              lifecycleScope,
+            ) { item ->
             val file = item.file.relativeTo(item.rootDir)
             val pathToIdentifier = directoryStructure.getPathToIdentifierFor(file)
             val identifier = directoryStructure.getIdentifierFor(file)

app/src/main/java/dev/msfjarvis/aps/ui/folderselect/SelectFolderFragment.kt

@@ -10,6 +10,7 @@ import android.view.View
 import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.github.michaelbull.result.onFailure
 import com.github.michaelbull.result.runCatching
@@ -36,7 +37,7 @@ class SelectFolderFragment : Fragment(R.layout.password_recycler_view) {
     super.onViewCreated(view, savedInstanceState)
     binding.fab.hide()
     recyclerAdapter =
-      PasswordItemRecyclerAdapter().onItemClicked { _, item ->
+      PasswordItemRecyclerAdapter(lifecycleScope).onItemClicked { _, item ->
         listener.onFragmentInteraction(item)
       }
     binding.passRecycler.apply {

app/src/main/java/dev/msfjarvis/aps/ui/passwords/PasswordFragment.kt

@@ -133,7 +133,7 @@ class PasswordFragment : Fragment(R.layout.password_recycler_view) {
     }
 
     recyclerAdapter =
-      PasswordItemRecyclerAdapter()
+      PasswordItemRecyclerAdapter(lifecycleScope)
         .onItemClicked { _, item -> listener.onFragmentInteraction(item) }
         .onSelectionChanged { selection ->
           // In order to not interfere with drag selection, we disable the

app/src/main/java/dev/msfjarvis/aps/util/viewmodel/SearchableRepositoryViewModel.kt

@@ -36,6 +36,7 @@ import java.io.File
 import java.text.Collator
 import java.util.Locale
 import java.util.Stack
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.FlowPreview
@@ -48,6 +49,7 @@ import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.mapLatest
 import kotlinx.coroutines.flow.toList
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.yield
 import me.zhanghai.android.fastscroll.PopupTextProvider
 
@@ -376,7 +378,8 @@ private object PasswordItemDiffCallback : DiffUtil.ItemCallback<PasswordItem>()
 open class SearchableRepositoryAdapter<T : RecyclerView.ViewHolder>(
   private val layoutRes: Int,
   private val viewHolderCreator: (view: View) -> T,
-  private val viewHolderBinder: T.(item: PasswordItem) -> Unit
+  private val coroutineScope: CoroutineScope,
+  private val viewHolderBinder: suspend T.(item: PasswordItem) -> Unit,
 ) : ListAdapter<PasswordItem, T>(PasswordItemDiffCallback), PopupTextProvider {
 
   fun <T : ItemDetailsLookup<String>> makeSelectable(
@@ -454,7 +457,7 @@ open class SearchableRepositoryAdapter<T : RecyclerView.ViewHolder>(
   final override fun onBindViewHolder(holder: T, position: Int) {
     val item = getItem(position)
     holder.apply {
-      viewHolderBinder.invoke(this, item)
+      coroutineScope.launch(Dispatchers.Main.immediate) { viewHolderBinder.invoke(holder, item) }
       selectionTracker?.let { itemView.isSelected = it.isSelected(item.stableId) }
       itemView.setOnClickListener {
         // Do not emit custom click events while the user is selecting items.