Merge pull request #33 from mario-bermonti:enable-exporting-data

Enable exporting data to downloads folder

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.mdigit_span_tasks">
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <application
         android:label="mdigit_span_tasks"
         android:name="${applicationName}"

lib/src/export_data/controller/data_exporter.dart

@@ -27,32 +27,30 @@ class DataExporter {
   /// with the name [dbName]. This method does not modify the original db.
   Future<void> getDB() async {
     final Directory dir = await getApplicationDocumentsDirectory();
-    dbPath = "${dir.path}/$dbName.sqlite3";
+    dbPath = "${dir.path}/$dbName";
     db = File(dbPath);
   }
 
   /// Get destination file on which to save the db copy.
-  /// The destination file will be in the external storage and will have the
-  /// same name as the db.
+  /// The destination file will be in the `Download` folder and will have the
+  /// same name as the dbs.
   /// Currently only android is supported.
   Future<void> initDestinationFile() async {
     Directory destinationDir = await _initDestinationDir();
-    final String destinationPath = '${destinationDir.path}/$dbName.sqlite3';
+    final String destinationPath = '${destinationDir.path}/$dbName';
     destinationFile = File(destinationPath);
   }
 
   /// Gets the directory to which the db will be exported.
   /// Currently only android is supported and the destination dir is a
-  /// directory named 'mDigitSpanTasks' in the android external storage.
+  /// directory named `mDigitSpanTasks` in the android `Download` folder.
   /// It creates the directory with its parent dirs if these do not exist.
   Future<Directory> _initDestinationDir() async {
-    Directory? externalDir = await getExternalStorageDirectory();
+    Directory downloadsDir =
+        Directory('/storage/emulated/0/Download/mDigitSpanTasks');
+    await downloadsDir.create(recursive: true);
 
-    /// TODO handle errors that will arise if [externalDir] is null
-    Directory dsExternalDir = Directory('${externalDir!.path}/mDigitSpanTasks');
-    dsExternalDir.create(recursive: true);
-
-    return dsExternalDir;
+    return downloadsDir;
   }
 
   /// Create copy of db in the path specified by [destinationFile].

lib/src/export_data/view/export_button.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:mdigit_span_tasks/src/services/services/export_dbs.dart';
 
 /// [ExportButton] Is used by the user to export the data from the app
 class ExportButton extends StatelessWidget {
@@ -8,7 +9,7 @@ class ExportButton extends StatelessWidget {
   Widget build(BuildContext context) {
     return IconButton(
       icon: const Icon(Icons.send_to_mobile),
-      onPressed: () {},
+      onPressed: () async => await exportDBs(),
     );
   }
 }