安卓：从我正在运行的服务获得一个变量 [英] Android: Getting a variable from my running service

问题描述

我的活动开始服务，而当我关闭我的应用程序，该服务将继续运行。
OK，这是正确的。但是，当我再次打开我的应用程序，在活动中，我需要知道，我已经开始pviously $ P $上运行的服务（类）中定义的公共变量的值。

My activity starts a Service, and when I close my app, the service continues to run. OK, that's right. But when I open my application again, in the activity, I need to know the value of a public variable defined on the running Service(class) that I've started previously.

我怎么能这样做？

感谢

推荐答案

如果您在您的活动绑定到服务，你应该在文件夹接口的实现你的服务，例如：

If you are binding your Activity to the Service, you should have an implementation of the Binder interface in your Service, e.g.

public class ServiceBinder extends Binder {
    public MyService getService() {
        return MyService.this;
    }
}

在您的活动中，创建​​一个新的 ServiceConnection 类将被用来给您访问服务：

In your Activity, create a new ServiceConnection class which will be used to give you access to your Service:

private ServiceConnection mConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName className, IBinder service) {
        mMyService = ((MyService.ServiceBinder)service).getService();
    }

    public void onServiceDisconnected(ComponentName className) {
        mMyService = null;
    }
};

下面的成员变量 mMyService 会给你访问你的服务类的所有公共成员。

Here the member variable mMyService will give you access to all public members of your Service class.

要创建连接，实施 doBindService 和 doUnbindService 在你的活动：

To create the connection, implement doBindService and doUnbindService in your Activity:

void doBindService() {
    bindService(new Intent(this, MyService.class), mConnection, Context.BIND_AUTO_CREATE);
}

void doUnbindService() {
    // Detach our existing connection.
    unbindService(mConnection);
}

希望这有助于！

这篇关于安卓：从我正在运行的服务获得一个变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！