[Android] Sort browsers content in background

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Fri Apr  6 16:50:00 2018 +0200| [fbe9d4ae584815a1238d1075fa7bc00058f2d10f] | committer: Geoffrey Métais

Sort browsers content in background

> https://code.videolan.org/videolan/vlc-android/commit/fbe9d4ae584815a1238d1075fa7bc00058f2d10f
---

 .../org/videolan/vlc/viewmodels/browser/BrowserProvider.kt    | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/vlc-android/src/org/videolan/vlc/viewmodels/browser/BrowserProvider.kt b/vlc-android/src/org/videolan/vlc/viewmodels/browser/BrowserProvider.kt
index 2064fe879..d08c8df51 100644
--- a/vlc-android/src/org/videolan/vlc/viewmodels/browser/BrowserProvider.kt
+++ b/vlc-android/src/org/videolan/vlc/viewmodels/browser/BrowserProvider.kt
@@ -8,9 +8,12 @@ import android.os.Process
 import android.support.annotation.MainThread
 import android.support.v4.util.SimpleArrayMap
 import android.text.TextUtils
+import kotlinx.coroutines.experimental.CommonPool
+import kotlinx.coroutines.experimental.CoroutineStart
 import kotlinx.coroutines.experimental.android.HandlerContext
 import kotlinx.coroutines.experimental.android.UI
 import kotlinx.coroutines.experimental.launch
+import kotlinx.coroutines.experimental.withContext
 import org.videolan.libvlc.Media
 import org.videolan.libvlc.util.MediaBrowser
 import org.videolan.libvlc.util.MediaBrowser.EventListener
@@ -73,9 +76,11 @@ abstract class BrowserProvider(val url: String?, private val showHiddenFiles: Bo
 
     @MainThread
     override fun sort(sort: Int) {
-        this.sort = sort
-        desc = !desc
-        dataset.value = dataset.value.apply { sortWith(if (desc) descComp else ascComp) }
+        launch(UI, CoroutineStart.UNDISPATCHED) {
+            this at BrowserProvider.sort = sort
+            desc = !desc
+            dataset.value = withContext(CommonPool) { dataset.value.apply { sortWith(if (desc) descComp else ascComp) } }
+        }
     }
 
     fun releaseBrowser() {