hide cleartext password

Signed-off-by: ImFatF1sh <imfatf1sh@protonmail.com>

lib/basic/Common.dart

@@ -148,7 +148,7 @@ Future<T?> chooseMapDialog<T>(
 var _controller = TextEditingController.fromValue(TextEditingValue(text: ''));
 
 Future<String?> displayTextInputDialog(BuildContext context,
-    {String? title, String src = "", String? hint, String? desc}) {
+    {String? title, String src = "", String? hint, String? desc, bool isPasswd = false}) {
   _controller.text = src;
   return showDialog(
     context: context,
@@ -161,6 +161,8 @@ Future<String?> displayTextInputDialog(BuildContext context,
               TextField(
                 controller: _controller,
                 decoration: InputDecoration(hintText: hint),
+                obscureText: isPasswd,
+                obscuringCharacter: '\u2022',
               ),
               ...(desc == null
                   ? []

lib/screens/AccountScreen.dart

@@ -95,13 +95,14 @@ class _AccountScreenState extends State<AccountScreen> {
           ),
           ListTile(
             title: Text("密码"),
-            subtitle: Text(_password == "" ? "未设置" : "******"),
+            subtitle: Text(_password == "" ? "未设置" : '\u2022' * 48),
             onTap: () async {
               String? input = await displayTextInputDialog(
                 context,
                 src: _password,
                 title: '密码',
                 hint: '请输入密码',
+                isPasswd: true,
               );
               if (input != null) {
                 await method.setPassword(input);

lib/screens/RegisterScreen.dart

@@ -99,7 +99,6 @@ class _RegisterScreenState extends State<RegisterScreen> {
                 Text('您已经注册成功, 请返回登录'),
                 Text('账号 : $_email'),
                 Text('昵称 : $_name'),
-                Text('密码 : $_password'),
                 Expanded(child: Container()),
                 Expanded(child: Container()),
               ],
@@ -140,13 +139,14 @@ class _RegisterScreenState extends State<RegisterScreen> {
           ),
           ListTile(
             title: Text("密码 (8位以上)"),
-            subtitle: Text(_password == "" ? "未设置" : _password),
+            subtitle: Text(_password == "" ? "未设置" : '\u2022' * 48),
             onTap: () async {
               String? input = await displayTextInputDialog(
                 context,
                 src: _password,
                 title: '密码',
                 hint: '请输入密码',
+                isPasswd: true,
               );
               if (input != null) {
                 setState(() {