检查是否安装了特定应用程序

Question

我想在现有应用中实现特定应用是否安装的条件。

条件：

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

Second app that is required for run first app

1. 如果已安装应用（第二个应用），则在第一个应用中运行 HomePage()
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.
}

并且在build 方法内部使用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);
          }
        })

很遗憾，此插件仅支持 ANDROID