如何从Main Activity运行java.class

Question

我是Android开发的初学者，希望有人能帮我一点忙。

我想连接到本地服务器(IP)。我在GitHub中找到了一段代码，据推测它可以实现这种连接。但问题是，这是一个java.class而不是在我的MainActivity中。因此，当我现在在模拟器中运行我的应用程序时，什么也没有发生。如何从MainActivity内部运行Java.class

这是源代码：https://github.com/calimero-project/introduction/tree/master/src/main/java

类：

public class CreateTunnelingLink
{

    /**
     * Local endpoint, replace the IP address with your actual address. The local socket address is important for
     * multi-homed clients (several network interfaces), or if the address via InetAddress.getLocalHost is not useful.
     */
    private static final InetSocketAddress local = new InetSocketAddress("192.168.10.13", 3671);

    /**
     * Specifies the KNXnet/IP server to access the KNX network, insert your server's actual host name or IP address,
     * e.g., "192.168.1.20". The default port is where most servers listen on for new connection requests.
     */
    private static final InetSocketAddress server = new InetSocketAddress("myKnxServer.myHome",
            KNXnetIPConnection.DEFAULT_PORT);

    public static void main(final String[] args)
    {
        System.out.println("This example establishes a tunneling connection to the KNXnet/IP server " + server);

        // A KNX tunneling link supports NAT (Network Address Translation) if required.
        // We also indicate that the KNX installation uses twisted-pair (TP) medium, with TP1 being the most common.
        // KNXNetworkLink is the base interface implemented by all supported Calimero links to a KNX network.
        try (KNXNetworkLink knxLink = KNXNetworkLinkIP.newTunnelingLink(local, server, false, TPSettings.TP1)) {
            System.out.println("Connection established to server " + knxLink.getName());
            System.out.println("Close connection again");
        }
        catch (KNXException | InterruptedException e) {
            // KNXException: all Calimero-specific checked exceptions are subtypes of KNXException

            // InterruptedException: longer tasks that might block are interruptible, e.g., connection procedures. In
            // such case, an instance of InterruptedException is thrown.
            // If a task got interrupted, Calimero will clean up its internal state and resources accordingly.
            // Any deviation of such behavior, e.g., where not feasible, is documented in the Calimero API.

            System.out.println("Error creating KNXnet/IP tunneling link: " + e);
        }
    }
}

MainActivity：

public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


}

Answer 1

尝尝这个

public class MainActivity extends AppCompatActivity {

    private static final InetSocketAddress local = new InetSocketAddress("192.168.10.13", 3671);
    private static final InetSocketAddress server = new InetSocketAddress("myKnxServer.myHome",
            KNXnetIPConnection.DEFAULT_PORT);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // call your method to do the task
        yourMethodForMakingConnection();
    }

// for better separation you can create a method for this task
private void yourMethodForMakingConnection() {
        System.out.println("This example establishes a tunneling connection to the KNXnet/IP server " + server);

        // A KNX tunneling link supports NAT (Network Address Translation) if required.
        // We also indicate that the KNX installation uses twisted-pair (TP) medium, with TP1 being the most common.
        // KNXNetworkLink is the base interface implemented by all supported Calimero links to a KNX network.
        try (KNXNetworkLink knxLink = KNXNetworkLinkIP.newTunnelingLink(local, server, false, TPSettings.TP1)) {
            System.out.println("Connection established to server " + knxLink.getName());
            System.out.println("Close connection again");
        }
        catch (KNXException | InterruptedException e) {
            // KNXException: all Calimero-specific checked exceptions are subtypes of KNXException

            // InterruptedException: longer tasks that might block are interruptible, e.g., connection procedures. In
            // such case, an instance of InterruptedException is thrown.
            // If a task got interrupted, Calimero will clean up its internal state and resources accordingly.
            // Any deviation of such behavior, e.g., where not feasible, is documented in the Calimero API.

            System.out.println("Error creating KNXnet/IP tunneling link: " + e);
        }
}


}

如果代码是正确的，这应该会起作用。将Activities的onCreate函数视为主函数。对于这么小的任务，您不需要另一个类。

或者，您也可以在MainActivity中的onCreate方法内创建该类的实例，然后调用main方法来建立从该类到对象的连接。

无论哪种方式，你都能做到。

您可以了解更多关于Android Development、Activity和Android Activity lifecycle的基础知识，以便更好地理解它们。