Periodically refresh download progress while in DownloadsActivity.

app/src/main/java/com/github/apognu/otter/activities/DownloadsActivity.kt

@@ -13,6 +13,7 @@ import kotlinx.android.synthetic.main.activity_downloads.*
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
 import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
@@ -24,10 +25,21 @@ class DownloadsActivity : AppCompatActivity() {
 
     setContentView(R.layout.activity_downloads)
 
+    downloads.itemAnimator = null
+
     adapter = DownloadsAdapter(this, DownloadChangedListener()).also {
+      it.setHasStableIds(true)
+
       downloads.layoutManager = LinearLayoutManager(this)
       downloads.adapter = it
     }
+
+    GlobalScope.launch(IO) {
+      while (true) {
+        delay(500)
+        refreshProgress()
+      }
+    }
   }
 
   override fun onResume() {
@@ -80,6 +92,28 @@ class DownloadsActivity : AppCompatActivity() {
     }
   }
 
+  private suspend fun refreshProgress() {
+    val cursor = Otter.get().exoDownloadManager.downloadIndex.getDownloads()
+
+    while (cursor.moveToNext()) {
+      val download = cursor.download
+
+      download.getMetadata()?.let { info ->
+        adapter.downloads.withIndex().associate { it.value to it.index }.filter { it.key.id == info.id }.toList().getOrNull(0)?.let { match ->
+          if (download.state == Download.STATE_DOWNLOADING && download.percentDownloaded != info.download?.percentDownloaded ?: 0) {
+            withContext(Main) {
+              adapter.downloads[match.second] = info.apply {
+                this.download = download
+              }
+
+              adapter.notifyItemChanged(match.second)
+            }
+          }
+        }
+      }
+    }
+  }
+
   inner class DownloadChangedListener : DownloadsAdapter.OnDownloadChangedListener {
     override fun onItemRemoved(index: Int) {
       adapter.downloads.removeAt(index)

app/src/main/java/com/github/apognu/otter/adapters/DownloadsAdapter.kt

@@ -22,6 +22,8 @@ class DownloadsAdapter(private val context: Context, private val listener: OnDow
 
   override fun getItemCount() = downloads.size
 
+  override fun getItemId(position: Int) = downloads[position].id.toLong()
+
   override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
     val view = LayoutInflater.from(context).inflate(R.layout.row_download, parent, false)
 
@@ -37,12 +39,12 @@ class DownloadsAdapter(private val context: Context, private val listener: OnDow
     download.download?.let { state ->
       when (state.isTerminalState) {
         true -> {
-          holder.progress.visibility = View.GONE
+          holder.progress.visibility = View.INVISIBLE
 
           when (state.state) {
             Download.STATE_FAILED -> {
               holder.toggle.setImageDrawable(context.getDrawable(R.drawable.retry))
-              holder.progress.visibility = View.GONE
+              holder.progress.visibility = View.INVISIBLE
             }
 
             else -> holder.toggle.visibility = View.GONE

app/src/main/res/layout/row_download.xml

@@ -5,7 +5,10 @@
   android:layout_height="wrap_content"
   android:background="?android:attr/selectableItemBackground"
   android:orientation="horizontal"
-  android:padding="16dp"
+  android:paddingStart="16dp"
+  android:paddingTop="6dp"
+  android:paddingEnd="16dp"
+  android:paddingBottom="6dp"
   tools:showIn="@layout/activity_downloads">
 
   <LinearLayout