add user screen example

android/src/main/java/com/lunagao/leancloudflutterplugin/LeancloudUser.java

@@ -0,0 +1,14 @@
+package com.lunagao.leancloudflutterplugin;
+
+import cn.leancloud.AVUser;
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+
+public class LeancloudUser {
+
+    void getCurrentUser(MethodCall call, final MethodChannel.Result result) {
+        AVUser currentUser = AVUser.getCurrentUser();
+        result.success(currentUser.toJSONString());
+    }
+
+}

example/lib/list_screen.dart

@@ -3,6 +3,8 @@ import 'package:flutter/material.dart';
 import 'package:leancloud_flutter_plugin/leancloud_object.dart';
 import 'package:leancloud_flutter_plugin/leancloud_query.dart';
 
+import 'user_screen.dart';
+
 class ListScreen extends StatefulWidget {
   @override
   _ListScreenState createState() => _ListScreenState();
@@ -121,6 +123,16 @@ class _ListScreenState extends State<ListScreen> {
                 onPressed: _queryByCQL,
                 child: Text('query by CQL'),
               ),
+              Text('login function'),
+              FlatButton(
+                onPressed: () {
+                  Navigator.push(
+                    context,
+                    MaterialPageRoute(builder: (context) => UserScreen()),
+                  );
+                },
+                child: Text('LOGIN'),
+              ),
             ],
           )
     );

example/lib/user_screen.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+
+class UserScreen extends StatefulWidget {
+  @override
+  _UserScreenState createState() => _UserScreenState();
+}
+
+class _UserScreenState extends State<UserScreen> {
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(
+          title: const Text('User Page'),
+        ),
+        body: ListView(
+          shrinkWrap: true,
+          padding: const EdgeInsets.all(20.0),
+          children: <Widget>[
+            Text("Please click 'create an Object' button"),
+            FlatButton(
+              onPressed: () {},
+              child: Text('Sign in'),
+            ),
+            FlatButton(
+              onPressed: () {},
+              child: Text('Login in'),
+            )
+          ],
+        )
+    );
+  }
+}

lib/leancloud_flutter_plugin.dart

@@ -120,6 +120,12 @@ class LeancloudFlutterPlugin {
     var args = <String, String>{'cql': cql};
     return await _channel.invokeMethod('doCloudQuery', args);
   }
+
+  /// Get current User
+  Future<String> currentUser() async {
+    var currentUserJson = await _channel.invokeMethod('currentUser');
+    return currentUserJson;
+  }
 }
 
 /// Leancloud logger level

lib/leancloud_user.dart

@@ -0,0 +1,15 @@
+import 'package:leancloud_flutter_plugin/leancloud_flutter_plugin.dart';
+import 'package:leancloud_flutter_plugin/leancloud_object.dart';
+
+class AVUser extends AVObject{
+
+  var _userName;
+
+  AVUser() : super("_User");
+
+//  AVUser currentUser() {
+//    var leancloudFlutterPlugin = LeancloudFlutterPlugin.getInstance();
+//    String jsonString = leancloudFlutterPlugin.currentUser();
+//    return leancloudFlutterPlugin.currentUser();
+//  }
+}