Deleting files in background

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt

@@ -373,7 +373,19 @@ class ExplorerActivity : BaseExplorerActivity() {
                 val size = explorerAdapter.selectedItems.size
                 val dialog = CustomAlertDialogBuilder(this, themeValue)
                 dialog.setTitle(R.string.warning)
-                dialog.setPositiveButton(R.string.ok) { _, _ -> removeSelectedItems() }
+                dialog.setPositiveButton(R.string.ok) { _, _ ->
+                    taskScope.launch {
+                        fileOperationService.removeElements(explorerAdapter.selectedItems.map { i -> explorerElements[i] })?.let { failedItem ->
+                            CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
+                                .setTitle(R.string.error)
+                                .setMessage(getString(R.string.remove_failed, failedItem))
+                                .setPositiveButton(R.string.ok, null)
+                                .show()
+                        }
+                        setCurrentPath(currentDirectoryPath) //refresh
+                    }
+                    unselectAll()
+                }
                 dialog.setNegativeButton(R.string.cancel, null)
                 if (size > 1) {
                     dialog.setMessage(getString(R.string.multiple_delete_confirm, explorerAdapter.selectedItems.size.toString()))
@@ -501,29 +513,4 @@ class ExplorerActivity : BaseExplorerActivity() {
             super.onBackPressed()
         }
     }
-
-    private fun removeSelectedItems() {
-        var failedItem: String? = null
-        for (i in explorerAdapter.selectedItems) {
-            val element = explorerAdapter.explorerElements[i]
-            val fullPath = PathUtils.pathJoin(currentDirectoryPath, element.name)
-            if (element.isDirectory) {
-                val result = encryptedVolume.recursiveRemoveDirectory(fullPath)
-                result?.let{ failedItem = it }
-            } else {
-                if (!encryptedVolume.deleteFile(fullPath)) {
-                    failedItem = fullPath
-                }
-            }
-            if (failedItem != null) {
-                CustomAlertDialogBuilder(this, themeValue)
-                        .setTitle(R.string.error)
-                        .setMessage(getString(R.string.remove_failed, failedItem))
-                        .setPositiveButton(R.string.ok, null)
-                        .show()
-                break
-            }
-        }
-        setCurrentPath(currentDirectoryPath) //refresh
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/file_operations/FileOperationService.kt

@@ -402,6 +402,30 @@ class FileOperationService : Service() {
         waitForTask(notification, task)
     }
 
+    suspend fun removeElements(items: List<ExplorerElement>): String? = coroutineScope {
+        val notification = showNotification(R.string.file_op_delete_msg, items.size)
+        val task = async(Dispatchers.IO) {
+            var failedItem: String? = null
+            for ((i, element) in items.withIndex()) {
+                if (element.isDirectory) {
+                    val result = encryptedVolume.recursiveRemoveDirectory(element.fullPath)
+                    result?.let { failedItem = it }
+                } else {
+                    if (!encryptedVolume.deleteFile(element.fullPath)) {
+                        failedItem = element.fullPath
+                    }
+                }
+                if (failedItem == null) {
+                    updateNotificationProgress(notification, i + 1, items.size)
+                } else {
+                    break
+                }
+            }
+            failedItem
+        }
+        waitForTask(notification, task).failedItem
+    }
+
     private fun recursiveCountChildElements(rootDirectory: DocumentFile, scope: CoroutineScope): Int {
         if (!scope.isActive) {
             return 0

app/src/main/res/values/strings.xml

@@ -246,4 +246,5 @@
     <string name="cryfs">CryFS</string>
     <string name="gocryptfs_disabled">Gocryptfs support has been disabled</string>
     <string name="cryfs_disabled">CryFS support has been disabled</string>
+    <string name="file_op_delete_msg">Deleting files…</string>
 </resources>