Android: Use coroutine for system updates

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/sysupdate/ui/SystemUpdateViewModel.kt

@@ -4,9 +4,12 @@ package org.dolphinemu.dolphinemu.features.sysupdate.ui
 
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.dolphinemu.dolphinemu.utils.WiiUpdateCallback
 import org.dolphinemu.dolphinemu.utils.WiiUtils
-import java.util.concurrent.Executors
 
 class SystemUpdateViewModel : ViewModel() {
     val progressData = MutableLiveData<Int>()
@@ -14,6 +17,7 @@ class SystemUpdateViewModel : ViewModel() {
     val titleIdData = MutableLiveData<Long>()
     val resultData = MutableLiveData<Int>()
 
+    private var isRunning = false
     private var canceled = false
     var region = -1
     var discPath: String = ""
@@ -27,10 +31,15 @@ class SystemUpdateViewModel : ViewModel() {
     }
 
     fun startUpdate() {
+        if (isRunning) return
+        isRunning = true
+
+        viewModelScope.launch {
+            withContext(Dispatchers.IO) {
                 if (discPath.isNotEmpty()) {
                     startDiscUpdate(discPath)
                 } else {
-            val region: String = when (this.region) {
+                    val region: String = when (region) {
                         0 -> "EUR"
                         1 -> "JPN"
                         2 -> "KOR"
@@ -39,23 +48,22 @@ class SystemUpdateViewModel : ViewModel() {
                     }
                     startOnlineUpdate(region)
                 }
+                isRunning = false
+            }
+        }
     }
 
-    private fun startOnlineUpdate(region: String?) {
+    private fun startOnlineUpdate(region: String) {
         canceled = false
-        executor.execute {
         val result = WiiUtils.doOnlineUpdate(region, constructCallback())
         resultData.postValue(result)
     }
-    }
 
-    private fun startDiscUpdate(path: String?) {
+    private fun startDiscUpdate(path: String) {
         canceled = false
-        executor.execute {
         val result = WiiUtils.doDiscUpdate(path, constructCallback())
         resultData.postValue(result)
     }
-    }
 
     fun clear() {
         progressData.value = 0
@@ -72,8 +80,4 @@ class SystemUpdateViewModel : ViewModel() {
             !canceled
         }
     }
-
-    companion object {
-        private val executor = Executors.newFixedThreadPool(1)
-    }
 }