uiStart() for coroutines UI context fine dispatch

vlc-android/src/org/videolan/vlc/util/Kextensions.kt

@@ -2,8 +2,10 @@ package org.videolan.vlc.util
 
 import android.arch.lifecycle.ViewModel
 import android.arch.lifecycle.ViewModelProviders
+import android.os.Looper
 import android.support.v4.app.Fragment
 import android.support.v4.app.FragmentActivity
+import kotlinx.coroutines.experimental.CoroutineStart
 import kotlinx.coroutines.experimental.delay
 import java.io.File
 import java.net.URI
@@ -43,4 +45,6 @@ suspend fun retry (
         delay(delayTime)
     }
     return block() // last attempt
-}
\ No newline at end of file
+}
+
+fun uiStart() = if (Looper.getMainLooper() == Looper.myLooper()) CoroutineStart.UNDISPATCHED else CoroutineStart.DEFAULT
\ No newline at end of file