child parameter has been deprecated

ImagePicker.pickImage() need parameter source: null

lib/screens/purchase.dart

@@ -298,7 +298,7 @@ class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {
       print(currency.toString());
       showDialog(
         context: context,
-        child: new AlertDialog(
+        builder: (_) => new AlertDialog(
           title: new Text(StringsLocalization.confirmation()),
           content:
           new Text(
@@ -325,7 +325,7 @@ class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {
   apiErrorAlert(String errorText) {
     showDialog(
       context: context,
-      child: new AlertDialog(
+      builder: (_) => new AlertDialog(
         content: new Text(errorText),
         actions: <Widget>[
           new FlatButton(

lib/screens/settings.dart

@@ -170,7 +170,7 @@ class SettingsState extends BaseState<SettingsScreen> {
   showYesNoDialog(BuildContext context, String title, String content) {
     showDialog<bool>(
       context: context,
-      child: new AlertDialog(
+      builder: (_) => new AlertDialog(
         title: new Text(title),
         content: new Text(content),
         actions: <Widget>[