add: android file transfer logic

flutter/lib/models/file_model.dart

@@ -144,6 +144,28 @@ class FileModel extends ChangeNotifier {
     notifyListeners();
   }
 
+  overrideFileConfirm(Map<String,dynamic> evt) async {
+    final resp = await showFileConfirmDialog(
+        translate("Overwrite"), "${evt['read_path']}", true);
+    if (false == resp) {
+      cancelJob(int.tryParse(evt['id']) ?? 0);
+    } else {
+      var msg = Map()
+        ..['id'] = evt['id']
+        ..['file_num'] = evt['file_num']
+        ..['is_upload'] = evt['is_upload']
+        ..['remember'] = fileConfirmCheckboxRemember.toString();
+      if (resp == null) {
+        // skip
+        msg['need_override'] = 'false';
+      } else {
+        // overwrite
+        msg['need_override'] = 'true';
+      }
+      FFI.setByName("set_confirm_override_file", jsonEncode(msg));
+    }
+  }
+
   jobReset() {
     _jobProgress.clear();
     notifyListeners();
@@ -392,6 +414,60 @@ class FileModel extends ChangeNotifier {
         useAnimation: false);
   }
 
+  bool fileConfirmCheckboxRemember = false;
+
+  Future<bool?> showFileConfirmDialog(
+      String title, String content, bool showCheckbox) async {
+    return await DialogManager.show<bool?>(
+            (setState, Function(bool? v) close) => CustomAlertDialog(
+            title: Row(
+              children: [
+                Icon(Icons.warning, color: Colors.red),
+                SizedBox(width: 20),
+                Text(title)
+              ],
+            ),
+            content: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  Text(translate("This file exists, skip or overwrite this file?"),
+                      style: TextStyle(fontWeight: FontWeight.bold)),
+                  SizedBox(height: 5),
+                  Text(content),
+                  showCheckbox
+                      ? CheckboxListTile(
+                    contentPadding: const EdgeInsets.all(0),
+                    dense: true,
+                    controlAffinity: ListTileControlAffinity.leading,
+                    title: Text(
+                      translate("Do this for all conflicts"),
+                    ),
+                    value: fileConfirmCheckboxRemember,
+                    onChanged: (v) {
+                      if (v == null) return;
+                      setState(() => fileConfirmCheckboxRemember = v);
+                    },
+                  )
+                      : SizedBox.shrink()
+                ]),
+            actions: [
+              TextButton(
+                  style: flatButtonStyle,
+                  onPressed: () => close(false),
+                  child: Text(translate("Cancel"))),
+              TextButton(
+                  style: flatButtonStyle,
+                  onPressed: () => close(null),
+                  child: Text(translate("Skip"))),
+              TextButton(
+                  style: flatButtonStyle,
+                  onPressed: () => close(true),
+                  child: Text(translate("OK"))),
+            ]),
+        useAnimation: false);
+  }
+
   sendRemoveFile(String path, int fileNum, bool isLocal) {
     final msg = {
       "id": _jobId.toString(),