Update local backup timestamp after manual export

app/src/main/java/org/tasks/dialogs/ExportTasksDialog.kt

@@ -1,9 +1,12 @@
 package org.tasks.dialogs
 
+import android.app.Activity.RESULT_OK
 import android.app.Dialog
 import android.app.ProgressDialog
+import android.content.DialogInterface
 import android.os.Bundle
 import androidx.fragment.app.DialogFragment
+import androidx.fragment.app.Fragment
 import androidx.lifecycle.lifecycleScope
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.NonCancellable
@@ -31,9 +34,15 @@ class ExportTasksDialog : DialogFragment() {
         return progressDialog
     }
 
+    override fun onDismiss(dialog: DialogInterface) {
+        super.onDismiss(dialog)
+
+        targetFragment?.onActivityResult(targetRequestCode, RESULT_OK, null)
+    }
+
     companion object {
-        fun newExportTasksDialog(): ExportTasksDialog {
+        fun newExportTasksDialog(target: Fragment, rc: Int) = ExportTasksDialog().apply {
-            return ExportTasksDialog()
+            setTargetFragment(target, rc)
         }
     }
 }

app/src/main/java/org/tasks/preferences/PreferencesViewModel.kt

@@ -60,7 +60,7 @@ class PreferencesViewModel @ViewModelInject constructor(
         lastDriveBackup.value = files.firstOrNull()?.let { BackupConstants.getTimestamp(it) }
     }
 
-    private fun updateLocalBackup() = viewModelScope.launch {
+    fun updateLocalBackup() = viewModelScope.launch {
         val uri = preferences.backupDirectory
         val timestamps: List<Long>? = withContext(Dispatchers.IO) {
             when (uri?.scheme) {

app/src/main/java/org/tasks/preferences/fragments/Backups.kt

@@ -26,6 +26,7 @@ import javax.inject.Inject
 private const val REQUEST_CODE_BACKUP_DIR = 10001
 const val REQUEST_DRIVE_BACKUP = 12002
 private const val REQUEST_PICKER = 10003
+private const val REQUEST_BACKUP_NOW = 10004
 private const val FRAG_TAG_EXPORT_TASKS = "frag_tag_export_tasks"
 private const val FRAG_TAG_IMPORT_TASKS = "frag_tag_import_tasks"
 
@@ -55,7 +56,7 @@ class Backups : InjectingPreferenceFragment() {
 
         findPreference(R.string.backup_BAc_export)
             .setOnPreferenceClickListener {
-                ExportTasksDialog.newExportTasksDialog()
+                ExportTasksDialog.newExportTasksDialog(this, REQUEST_BACKUP_NOW)
                     .show(parentFragmentManager, FRAG_TAG_EXPORT_TASKS)
                 false
             }
@@ -138,6 +139,7 @@ class Backups : InjectingPreferenceFragment() {
                     )
                 preferences.setUri(R.string.p_backup_dir, uri)
                 updateBackupDirectory()
+                viewModel.updateLocalBackup()
             }
         } else if (requestCode == REQUEST_PICKER) {
             if (resultCode == RESULT_OK) {
@@ -154,6 +156,10 @@ class Backups : InjectingPreferenceFragment() {
                         .show(parentFragmentManager, FRAG_TAG_IMPORT_TASKS)
                 }
             }
+        } else if (requestCode == REQUEST_BACKUP_NOW) {
+            if (resultCode == RESULT_OK) {
+                viewModel.updateLocalBackup()
+            }
         } else {
             super.onActivityResult(requestCode, resultCode, data)
         }