Question

是否有垃圾屏幕（启动屏幕）一直显示到应用所需的数据准备就绪？

manifest.xml中还有以下其他选项吗？ “ io.flutter.app.android.SplashScreenUntilFirstFrame”

Answer 1

多次重试后，我发现了可以优化的解决方案。请告诉我您的意见

通常扑打始于

void main() => runApp(new MyApp());

我首先通过修改代码插入了数据采集

void main() async {

  final OrderedAppList aList = new OrderedAppList(); //class to get all data

  var funx = (int) async => aList.getit(); //to get all of the data

    var value;
    value = await funx(1); //should wait for the return value

  runApp(new MyApp(
      qallUserApps: aList.allUserApps,
      qlistLen: value, // means aList.listLen,
      qplatformVersion: aList.platformVersion,
      qmodel: aList.model
  ));
  }

在MyApp中：

class MyApp extends StatelessWidget {
  final List qallUserApps;
  final int qlistLen;
  final String qplatformVersion;
  final String qmodel;

  // Constructor:
  const MyApp({Key key, this.qallUserApps,
                        this.qlistLen,
                        this.qplatformVersion,
                        this.qmodel})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
// ...
}

OrderedAppList类的代码部分：

class OrderedAppList {
  int listLen= -1;
  String platformVersion = "Unknown Platform";
  String model = "Unknown Platform";
  List allUserApps = null;


  Future<int> getit() async {
    try {
      allUserApps = await AppsAsStateless.allApps;
      listLen = allUserApps.length;
    } on Exception {
      allUserApps = null;
      listLen = 0;
    }
// ...
return listLen ;
}

感谢阅读！

Answer 2

它工作正常并且可以优化main中的代码：

void main() async { // async that data acquisition done before any widgets shown

  final OrderedAppList aList = new OrderedAppList();

  int value;
  value = await aList.getit();

  runApp(new MyApp(
      qallUserApps: aList.allUserApps,
      qlistLen: value, // = aList.listLen,
      qplatformVersion: aList.platformVersion,
      qmodel: aList.model
  ));
}

如何保持启动画面直到数据准备就绪

2 个答案: