从服务更改另一个类中的 TextView
我有两门课程，一门是标准活动，另一门是服务。我希望服务在服务中发生的某些事件上更新 Activity 的 TextView （通过 .setText()）。
我尝试通过在 Activity-Class 中编写类似于 setter 方法的方法来实现此目的，但是 TextView 不接受 static-引用，当我尝试调用 Activity- 的实例时，类（通过 MyActivityClassName aVariable = new MyActivityClassName();），我得到一个 NullPointer 异常，即使问题中的视图在调用时可见。
谁能告诉我我做错了什么:-)？这可能更像是一个基本的 Java 问题，而不是 Android 问题，但由于它可能与 Android 服务的性质有关，因此我仍然添加了 android 标签。
感谢您的帮助！
I have two classes, one is a standard activity, the other a service. I would like the service to update a TextView (via .setText()) of the Activity on certain events that happen within the service.
I've tried to achieve this by programming something like a setter-method inside the Activity-Class, but TextViews don't accept a static-reference, and when I try invoking an instance of the Activity-class instead (via MyActivityClassName aVariable = new MyActivityClassName();), I get a NullPointer Exception, even though the View in questions is visible at the time of the call.
Could anyone tell me what I'm doing wrong :-)? It is probably more of a basic Java question than an Android-one, but since it might have to do with the nature of Android-services, I've still added the android-tag.
Thanks for your help!
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我强烈建议加强逻辑解耦。让
Service告诉Activity更新TextView。您可以通过广播
Intent来做到这一点，或者让Activity提供Service调用的侦听器对象。无论哪种情况，请确保 Activity 与服务分离（取消注册侦听器或广播Intent接收器），以免导致内存泄漏。当然，这仅在活动实际运行时才有效。
I would strongly recommend greater logical decoupling. Have the
Servicetell theActivityto update theTextView.You can do that via a broadcast
Intent, or by having theActivityprovide a listener object that theServicecalls. In either case, be sure the Activity detaches from the service (unregisters the listener or broadcastIntentreceiver), lest you cause a memory leak.And, of course, this only works if the activity is actually running.