首先，您不应该通过使用ActivityManager来访问服务。(下面讨论)

Services can run on their own, be bound to an Activity or both. The way to check in an Activity if your Service is running or not is by making an interface (that extends Binder) where you declare methods that both, the Activity and the Service, understand. You can do this by making your own Interface where you declare for example "isServiceRunning()". You can then bind your Activity to your Service, run the method isServiceRunning(), the Service will check for itself if it is running or not and returns a boolean to your Activity.

您还可以使用此方法停止您的服务或以其他方式与之交互。

你可以使用Android开发者选项中的这个选项来查看你的服务是否仍然在后台运行。

1. Open Settings in your Android device.
2. Find Developer Options.
3. Find Running Services option.
4. Find your app icon.
5. You will then see all the service that belongs to your app running in the background.

对于kotlin，可以使用下面的代码。

fun isMyServiceRunning(calssObj: Class<SERVICE_CALL_NAME>): Boolean {
    val manager = requireActivity().getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
    for (service in manager.getRunningServices(Integer.MAX_VALUE)) {
        if (calssObj.getName().equals(service.service.getClassName())) {
            return true
        }
    }
    return false
}

得到它!

你必须调用startService()为你的服务正确注册和传递BIND_AUTO_CREATE是不够的。

Intent bindIntent = new Intent(this,ServiceTask.class);
startService(bindIntent);
bindService(bindIntent,mConnection,0);

现在是ServiceTools类:

public class ServiceTools {
    private static String LOG_TAG = ServiceTools.class.getName();

    public static boolean isServiceRunning(String serviceClassName){
        final ActivityManager activityManager = (ActivityManager)Application.getContext().getSystemService(Context.ACTIVITY_SERVICE);
        final List<RunningServiceInfo> services = activityManager.getRunningServices(Integer.MAX_VALUE);

        for (RunningServiceInfo runningServiceInfo : services) {
            if (runningServiceInfo.service.getClassName().equals(serviceClassName)){
                return true;
            }
        }
        return false;
     }
}

这更适用于Intent Service调试，因为它们会生成一个线程，但也适用于常规服务。我找到这个线程感谢宾

在我的例子中，我摆弄了调试器并找到了线程视图。它看起来有点像微软Word里的项目符号图标。无论如何，您不必在调试器模式下使用它。单击该流程并单击该按钮。任何Intent服务都会在运行时显示出来，至少在模拟器上是这样。

如果你有一个多模块的应用程序，你想知道服务是否从一个模块运行，这取决于包含该服务的模块，你可以使用这个函数:

fun isServiceRunning(context: Context, serviceClassName: String): Boolean {

    val manager = ContextCompat.getSystemService(
        context,
        ActivityManager::class.java
    ) ?: return false

    return manager.getRunningServices(Integer.MAX_VALUE).any { serviceInfo ->
        serviceInfo.service.shortClassName.contains(vpnServiceClassName)
    }
}

MyService服务用法:

isServiceRunning(context, "MyService")

如果服务类名称更改而调用函数没有相应更改，则此函数可能无法正常工作。