squash pdf export + storage permissions

lib/savesystem/note_file.dart

@@ -18,11 +18,18 @@ class NoteFile {
     final path = (await getSavePath()).path + Platform.pathSeparator + filepath;
     _db = await openDatabase(
       path,
-      onCreate: (db, version) {
-        return db.execute(
-          'CREATE TABLE strokes(id integer primary key autoincrement, color INTEGER, elevation INTEGER);'
-          'CREATE TABLE points(id integer primary key autoincrement, x INTEGER, y INTEGER, thickness REAL, strokeid INTEGER)',
-        );
+      onCreate: (db, version) async {
+        Batch batch = db.batch();
+
+        batch.execute('DROP TABLE IF EXISTS strokes;');
+        batch.execute('DROP TABLE IF EXISTS points;');
+
+        batch.execute(
+            'CREATE TABLE strokes(id integer primary key autoincrement, color INTEGER, elevation INTEGER)');
+        batch.execute(
+            'CREATE TABLE points(id integer primary key autoincrement, x INTEGER, y INTEGER, thickness REAL, strokeid INTEGER)');
+        await batch.commit();
+        return;
       },
       // Set the version. This executes the onCreate function and provides a
       // path to perform database upgrades and downgrades.

lib/savesystem/path.dart

@@ -7,8 +7,11 @@ Future<Directory> getSavePath() async {
   Directory dbpath;
   if (defaultTargetPlatform == TargetPlatform.android ||
       defaultTargetPlatform == TargetPlatform.iOS) {
+    final dir =
+        (await getExternalStorageDirectory())?.parent.parent.parent.parent ??
+            (await getApplicationDocumentsDirectory());
     dbpath = Directory(
-        '${(await getApplicationDocumentsDirectory()).path}${Platform.pathSeparator}notes');
+        '${dir.path}${Platform.pathSeparator}Documents${Platform.pathSeparator}notes');
   } else {
     dbpath = Directory(
         '${(await getApplicationDocumentsDirectory()).path}${Platform.pathSeparator}notes');