some errors handled

Author: jspw

lib/main.dart

@@ -8,6 +8,7 @@ void main() async {
   runApp(
     new MaterialApp(
       title: "Codeforces",
+      debugShowCheckedModeBanner: false,
       home: Home(),
     ),
   );

lib/ui/compare.dart

@@ -75,12 +75,6 @@ class Compare extends StatelessWidget {
           "assets/images/cf.png",
           height: 30.0,
         ),
-        actions: [
-          IconButton(
-            icon: Icon(Icons.menu),
-            color: Colors.black,
-          )
-        ],
       ),
       body: new ListView(
         children: <Widget>[

lib/ui/home.dart

@@ -246,26 +246,14 @@ class HomeState extends State {
           height: 25.0,
         ),
         actions: [
-          IconButton(
-              icon: Icon(
-                Icons.menu,
-                color: Colors.black,
-              ),
-              onPressed: null)
         ],
       ),
       body: new FutureBuilder(
           future: contestInfo(),
           builder: (BuildContext context, AsyncSnapshot snapshot) {
             if (snapshot.data == null) {
               return Center(
-                child: Text(
-                  "Loading data.......",
-                  style: TextStyle(
-                    color: Colors.green,
-                    fontSize: 25.0,
-                  ),
-                ),
+                child: CircularProgressIndicator(),
               );
             } else {
               return ListView.builder(

lib/ui/output.txt

@@ -130,26 +130,12 @@ class PreviousContestsState extends State {
           height: 25.0,
           // width: 20.0,
         ),
-        actions: [
-          IconButton(
-            icon: Icon(Icons.menu),
-            color: Colors.black,
-          )
-        ],
       ),
       body: new FutureBuilder(
           future: contestInfo(),
           builder: (BuildContext context, AsyncSnapshot snapshot) {
             if (snapshot.data == null) {
-              return Center(
-                child: Text(
-                  "Loading data.......",
-                  style: TextStyle(
-                    color: Colors.green,
-                    fontSize: 25.0,
-                  ),
-                ),
-              );
+              return Center(child: CircularProgressIndicator());
             } else {
               return ListView.builder(
                   itemCount: snapshot.data['result'].length,

lib/ui/previous_contests.dart

@@ -140,12 +140,6 @@ class User extends StatelessWidget {
           "assets/images/cf.png",
           height: 25.0,
         ),
-        actions: [
-          IconButton(
-            icon: Icon(Icons.menu),
-            color: Colors.black,
-          )
-        ],
       ),
       body: new ListView(
         physics: ScrollPhysics(),