Navigation between screens without previous states showing.

android/app/build.gradle

@@ -15,15 +15,15 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '25.0.0'
+    compileSdkVersion 27
+    buildToolsVersion '27.0.3'
 
     lintOptions {
         disable 'InvalidPackage'
     }
 
     defaultConfig {
-        targetSdkVersion 21
+        targetSdkVersion 27
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         applicationId "com.dinect.checker"
     }
@@ -38,7 +38,9 @@ android {
         }
     }
 
-    // Не смог разобраться, как коомбинировать flavors в flutter при запуске
+  flavorDimensions "checker"
+
+  // Не смог разобраться, как коомбинировать flavors в flutter при запуске
 
     productFlavors {
 
@@ -185,7 +187,7 @@ flutter {
 
 dependencies {
     compile fileTree(include: ['*.jar'], dir: 'libs')
-    compile 'com.android.support:appcompat-v7:25.3.1'
+    compile 'com.android.support:appcompat-v7:27.1.0'
     compile 'com.squareup.okhttp3:okhttp:3.8.1'
     compile 'com.squareup.okio:okio:1.13.0'
     compile 'me.dm7.barcodescanner:zxing:1.9.8'

android/app/src/main/res/layout/a_zbar.xml

@@ -15,15 +15,13 @@
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_marginBottom="56dp"
-            android:layout_weight="0.5"
-            android:background="#с0000000" />
+            android:layout_weight="0.5"/>
 
         <View
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_marginTop="56dp"
-            android:layout_weight="0.5"
-            android:background="#с0000000" />
+            android:layout_weight="0.5" />
 
     </LinearLayout>
 

android/build.gradle

@@ -1,16 +1,18 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.0.1'
     }
 }
 
 allprojects {
     repositories {
         jcenter()
+        google()
         maven {
             url "https://maven.google.com"
         }

lib/screens/purchase.dart

@@ -39,10 +39,17 @@ class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {
   }
 
   @override
-  Widget build(BuildContext ctx) {
+  void initState() {
+
     setState(() {
       requestAsyncData(user);
     });
+
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext ctx) {
     return getMainWidget();
   }
 
@@ -172,7 +179,7 @@ class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {
         child: new FlatButton(
             child: new Text(title, style: new TextStyle(color: textColor)),
           //    FIXME:  onPressed: () => startScanner(context, app, helper)),
-            onPressed: () => print('startScanner')),
+            onPressed: () => Navigator.of(context).pop(true)),
         decoration: new BoxDecoration(
             border: new Border.all(
                 color: Resources.getButtonColor(app), width: 1.0),

lib/screens/splash.dart

@@ -28,13 +28,28 @@ class SplashScreen extends BaseScreen {
 class _SplashScreenState extends BaseState<SplashScreen> {
 
   _SplashScreenState(SqliteHelper helper, String app) : super(helper, app);
+  bool a = false;
+
+  @override
+  void initState() {
+
+    print('init state!');
+
+    new Future.delayed(const Duration(milliseconds: 1000), () {
+      showNextScreen();
+      a = true;
+    });
+
+    super.initState();
+  }
 
   @override
   Widget build(BuildContext ctx) {
-    new Future.delayed(const Duration(milliseconds: 1000), () {
-      showNextScreen();
-    });
-    return getScreenContent();
+    return a ? new Container(
+      decoration: new BoxDecoration(
+        image: new DecorationImage(
+          image: new ExactAssetImage(Resources.getSplash(nullq)),
+          fit:  BoxFit.cover))) : getScreenContent();
   }
 
   @override
@@ -151,6 +166,7 @@ class _SplashScreenState extends BaseState<SplashScreen> {
     // Канал ловит вызовы методов из "нативной" части приложения.
     // Могут быть вызваны либо exit либо faq, либо purchase.
     platform.setMethodCallHandler((MethodCall call) {
+      print(this.toString());
       if (call.method == 'findUser') {
         String cardPhone = call.arguments[0];
         var userResponse = getUser(call.arguments[1], cardPhone, token);
@@ -190,18 +206,7 @@ class _SplashScreenState extends BaseState<SplashScreen> {
         String card = call.arguments[1];
         print('$userString, $card');
 
-        new Future.delayed(const Duration(milliseconds: 200), () {
-          var route = new MaterialPageRoute<bool>(
-            builder: (BuildContext context) => new PurchaseScreen(helper, app, userString, card),
-            fullscreenDialog: true);
-          Navigator.of(context).push(route).then((b) {
-            if (b) {
-              setState(() {
-                print('restart scanner!');
-              });
-            }
-          });
-        });
+        startScanner(token, userString, card);
       }
     });
 
@@ -221,6 +226,17 @@ class _SplashScreenState extends BaseState<SplashScreen> {
     });
   }
 
+  startScanner(String token, String userString, String card) {
+    new Future.delayed(const Duration(milliseconds: 200), () {
+      var route = new MaterialPageRoute<bool>(
+        builder: (BuildContext context) => new PurchaseScreen(helper, app, userString, card), fullscreenDialog: true);
+        Navigator.of(context).push(route).then((b) {
+          print('purchase closed: $b');
+          _initAndStartScanner(context, app, token, helper);
+      });
+    });
+  }
+
   Future<Response> getUser(String type, String cardPhone, String token) {
     try {
       switch (type) {