flutter - 检查是否安装了特定的应用程序

Question

我想在我现有的应用程序中实现是否安装了特定应用程序的条件。

条件：

the first app is that which is I'm going to build

Second app that is required for run first app

1. 如果安装了应用程序（第二个应用程序），则HomePage()在第一个应用程序中运行
2. 如果未安装应用程序，则显示安装应用程序的弹出窗口或警报。

第一个应用程序的根代码

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
    future: Future.delayed(Duration(seconds: 2)),
        builder: (context, AsyncSnapshot snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return MaterialApp(
              home: Splash(),
              debugShowCheckedModeBanner: false,
            );
          } else {
            return StreamBuilder(
              stream: Connectivity().onConnectivityChanged,
              builder: (context, AsyncSnapshot<ConnectivityResult> snapshot) {
                return snapshot.data == ConnectivityResult.mobile ||
                        snapshot.data == ConnectivityResult.wifi
                    ? MaterialApp(
                        title: 'mFollower',
                        theme: ThemeData(
                          primarySwatch: Colors.blue,
                        ),
                        home: Homepage(),
                        debugShowCheckedModeBanner: false,
                      )
                    : NoInternet();
              },
            );
          }

        });
  }
}

Answer 1

这可以使用包device_apps包来实现。这将返回 Android 设备中安装的应用程序列表。

// All the apps installed in the device
List<Application> apps = await DeviceApps.getInstalledApplications();

因此，根据您的要求，您可以执行以下操作

Future<bool> isAppInstalled() {
    return DeviceApps.getInstalledApplications().then((value) =>
        value.any((element) => element.packageName == 'com.example.app')); // Your app package id to check.
}

内部build方法使用 Future builder 来获取结果。

FutureBuilder<bool>(
        future: apps(),
        builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
          if (snapshot.hasData && snapshot.data) {
            // App is installed
            return Container(
              color: Colors.green,
            );
          } else {
            // App is not installed
            return Container(color: Colors.redAccent);
          }
        })

不幸的是，此插件仅支持 ANDROID