sqllite database save magnetic declination data

lib/states/token.dart

@@ -12,7 +12,7 @@ class TokenProvider extends ChangeNotifier {
 
   bool get isLogin => _loginBean != null;
 
-  loadToken() {
+  void loadToken() {
     Map<String, dynamic> map = SPUtil.getObject("token_bean");
     if (map != null) {
       //加载缓存
@@ -21,13 +21,15 @@ class TokenProvider extends ChangeNotifier {
     notifyListeners();
   }
 
-  clearToken() {
+  void clearToken() {
     _loginBean = null;
+    SPUtil.remove("token_bean");
     notifyListeners();
   }
 
-  setToken(LoginBean lb) {
+  void setToken(LoginBean lb) {
     _loginBean = lb;
+    SPUtil.saveObject("token_bean", lb);
     notifyListeners();
   }
 }