android - 通过带有按钮的套接字连接

Question

是我被这个问题困住的日子。我用片段和选项卡创建了一个应用程序，我必须插入一个按钮，单击该按钮连接到某个 ip 和某个端口，我不知道如何编写和放置它，它们只能连接它启动mainActivity，但我希望可以通过一个按钮来控制它，你能帮忙吗？

Answer 1

我可以，我将代码行从：

@Override
    protected Boolean doInBackground(InetSocketAddress... params) {

        InetSocketAddress addr = params[0];

        try {
            **socket = new Socket(addr.getAddress().toString(), addr.getPort());**
        } catch (UnknownHostException e) {
            e.printStackTrace();
            return false;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

至

 @Override
    protected Boolean doInBackground(InetSocketAddress... params) {

        InetSocketAddress addr = params[0];

        try {
            **socket = new Socket("192.168.1.1", 80);**
        } catch (UnknownHostException e) {
            e.printStackTrace();
            return false;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

谢谢大家

Answer 2

首先，在 Android 框架的最新版本中，所有网络操作都不能从主线程（即管理 UI 的线程）执行。因此，您需要使用自己的线程来建立连接。

一个例子：

package it.resis.solarapp.activities.fourcloud.application;

import it.resis.solarapp.R;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class CopyOfActivity4CloudConfiguration extends Activity {

    private volatile Socket socket = null;
    private boolean connectionOk = false;
    private Button buttonDisconnect;
    private Button buttonConnect;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_layout);

        buttonConnect = findViewById(R.id.buttonConnect);
        buttonConnect.setOnClickListener(new Button.OnClickListener() {

            @Override
            public void onClick(View v) {
                InetSocketAddress addr = new InetSocketAddress("192.168.1.1", 80);
                new ConnectToIpTask().execute(addr);
            }
        });

        buttonDisconnect = findViewById(R.id.buttonDisconnect);
        buttonConnect.setOnClickListener(new Button.OnClickListener() {

            @Override
            public void onClick(View v) {
                new CloseSocket().execute();
            }
        });

        buttonDisconnect.setEnabled(false);
        buttonConnect.setEnabled(true);
    }

    private class ConnectToIpTask extends AsyncTask<InetSocketAddress, Void, Boolean> {

        @Override
        protected Boolean doInBackground(InetSocketAddress... params) {

            InetSocketAddress addr = params[0];

            try {
                socket = new Socket(addr.getAddress().toString(), addr.getPort());
            } catch (UnknownHostException e) {
                e.printStackTrace();
                return false;
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
            return true;
        }

        @Override
        protected void onPostExecute(Boolean result) {
            super.onPostExecute(result);
            connectionOk = result;

            // update here the ui with result
            if (result) {
                buttonDisconnect.setEnabled(true);
                buttonConnect.setEnabled(false);
            }
        }
    }

    private class CloseSocket extends AsyncTask<Void, Void, Void> {

        @Override
        protected Void doInBackground(Void... params) {
            try {
                socket.close();
            } catch (Exception ex) {

            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            buttonDisconnect.setEnabled(false);
            buttonConnect.setEnabled(true);
        }
    }
}