Support for multiplication operation in score entering dialog.

Updated minimum SDK version to support audio input in future.

README.md

@@ -9,6 +9,8 @@ Weekend project: a score counter (leaderboard) for games like Scrabble, written
 
 - easy to use, native interface;
 
+- you can ask program to multiply numbers for you, i.e. `3*18` will result in `54`.
+
 - ability to add or remove players during the game;
 
 - intrigues players till the end: final score isn't displayed until you explicitly want it.
@@ -29,3 +31,6 @@ Weekend project: a score counter (leaderboard) for games like Scrabble, written
 
 ### 1.0.0:
 - persistent players and scores.
+
+### 1.1.0:
+- added math to input parsing.

android/app/build.gradle

@@ -39,7 +39,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.proprepress.eleven"
-        minSdkVersion 16
+        minSdkVersion 21
         targetSdkVersion 28
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

lib/tabs/game_tab.dart

@@ -105,6 +105,10 @@ class ScoresState extends State<Scores> {
     }
   }
 
+  int parseInput(input) {
+    return input.split("*").fold(1, (a, b) => a * (int.tryParse(b) ?? 1));
+  }
+
   Widget scoreDialog(BuildContext context, int score) {
     String dialogText = score == null ? "Enter score" : "Edit score";
     TextEditingController initialValue = score == null ? null : TextEditingController(text: score.toString());
@@ -115,9 +119,9 @@ class ScoresState extends State<Scores> {
           controller: initialValue,
           autofocus: true,
           keyboardType: TextInputType.phone,
-          inputFormatters: [WhitelistingTextInputFormatter.digitsOnly],
+          inputFormatters: [WhitelistingTextInputFormatter(RegExp(r"\d|\*"))],
           decoration: InputDecoration(),
-          onSubmitted: (s) => Navigator.of(context).pop(int.tryParse(s))
+          onSubmitted: (input) => Navigator.of(context).pop(parseInput(input))
       ),
       actions: [
         FlatButton(