Import: implement importing tasks from file.

Fixes #74.

app/src/main/java/com/etesync/syncadapter/ui/ViewCollectionActivity.kt

@@ -142,14 +142,6 @@ class ViewCollectionActivity : BaseActivity(), Refreshable {
     }
 
     fun onImport(item: MenuItem) {
-        if (info.type == CollectionInfo.Type.TASKS) {
-            val dialog = AlertDialog.Builder(this)
-                    .setIcon(R.drawable.ic_info_dark)
-                    .setTitle("Not Implemented")
-                    .setMessage("Importing tasks is not yet implemented")
-            dialog.show()
-            return
-        }
         startActivity(ImportActivity.newIntent(this@ViewCollectionActivity, account, info))
     }
 

app/src/main/java/com/etesync/syncadapter/ui/importlocal/ImportActivity.kt

@@ -144,6 +144,10 @@ class ImportActivity : BaseActivity(), SelectImportMethod, ResultFragment.OnImpo
             text.setText(R.string.import_button_local)
             card.setOnClickListener { mSelectImportMethod!!.importAccount() }
 
+            if ((activity as ImportActivity).info.type == CollectionInfo.Type.TASKS) {
+                card.visibility = View.GONE
+            }
+
             return v
         }
     }

app/src/main/java/com/etesync/syncadapter/ui/importlocal/ImportFragment.kt

@@ -14,9 +14,7 @@ import android.os.Bundle
 import android.provider.CalendarContract
 import android.provider.ContactsContract
 import androidx.fragment.app.DialogFragment
-import at.bitfire.ical4android.CalendarStorageException
-import at.bitfire.ical4android.Event
-import at.bitfire.ical4android.InvalidCalendarException
+import at.bitfire.ical4android.*
 import at.bitfire.vcard4android.BatchOperation
 import at.bitfire.vcard4android.Contact
 import at.bitfire.vcard4android.ContactsStorageException
@@ -117,10 +115,10 @@ class ImportFragment : DialogFragment() {
         intent.addCategory(Intent.CATEGORY_OPENABLE)
         intent.action = Intent.ACTION_GET_CONTENT
 
-        if (info.type == CollectionInfo.Type.CALENDAR) {
-            intent.type = "text/calendar"
-        } else if (info.type == CollectionInfo.Type.ADDRESS_BOOK) {
-            intent.type = "text/x-vcard"
+        when (info.type) {
+            CollectionInfo.Type.CALENDAR -> intent.type = "text/calendar"
+            CollectionInfo.Type.TASKS -> intent.type = "text/calendar"
+            CollectionInfo.Type.ADDRESS_BOOK -> intent.type = "text/x-vcard"
         }
 
         val chooser = Intent.createChooser(
@@ -256,6 +254,44 @@ class ImportFragment : DialogFragment() {
                             e.printStackTrace()
                         }
 
+                        entryProcessed()
+                    }
+                } else if (info.type == CollectionInfo.Type.TASKS) {
+                    val tasks = Task.fromReader(importReader)
+                    importReader.close()
+
+                    if (tasks.isEmpty()) {
+                        Logger.log.warning("Empty/invalid file.")
+                        result.e = Exception("Empty/invalid file.")
+                        return result
+                    }
+
+                    result.total = tasks.size.toLong()
+
+                    finishParsingFile(tasks.size)
+
+                    val provider = TaskProvider.acquire(context, TaskProvider.ProviderName.OpenTasks)!!
+                    val localTaskList: LocalTaskList?
+                    try {
+                        localTaskList = LocalTaskList.findByName(account, provider, LocalTaskList.Factory, info.uid!!)
+                        if (localTaskList == null) {
+                            throw FileNotFoundException("Failed to load local resource.")
+                        }
+                    } catch (e: FileNotFoundException) {
+                        Logger.log.info("Fail" + e.localizedMessage)
+                        result.e = e
+                        return result
+                    }
+
+                    for (task in tasks) {
+                        try {
+                            val localTask = LocalTask(localTaskList, task, task.uid, null)
+                            localTask.addAsDirty()
+                            result.added++
+                        } catch (e: CalendarStorageException) {
+                            e.printStackTrace()
+                        }
+
                         entryProcessed()
                     }
                 } else if (info.type == CollectionInfo.Type.ADDRESS_BOOK) {