Java Android调用TCP客户端方法

我通过在UI中按下按钮a来调用服务。作为回报，服务调用类中的TCP/IP客户端方法。服务启动时没有任何问题，但只要调用TCP/IP客户端方法，它就会使UI活动崩溃。我甚至尝试在没有服务的情况下直接调用此方法，但它仍然崩溃。此类未在清单中注册为活动，但我已在清单中声明了以下内容：

 <uses-permission android:name="android.permission.INTERNET" />
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

服务

    public class Tx extends Service {

    Atx atx = new Atx();


    @Override public int onStartCommand(Intent intent, int flags, int startId) {


    Toast.makeText(this, " TX Service Started", Toast.LENGTH_LONG).show();
    Bundle extras = intent.getExtras();
    String msg = extras.getString("EXTRA_M");
    final String svrip = extras.getString("EXTRA_IP");

      try {
        atx.transmitAck(msg,svrip);
    } catch (IOException e) {
        e.printStackTrace();
    }


    stopSelf();

    return START_NOT_STICKY;
}



public Tx() {
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
}
}

包含TCP/IP客户端方法的类

   public class Atx {


public void  transmitAck (String msg, String ipadress ) throws IOException {
    int no_con_timeout =10000;
    int port = 25901;


    try {
        InetAddress IPAddress =InetAddress.getByName(ipadress);
        byte[] byteBuffer =msg.getBytes();
            Socket client = new Socket();
            client.connect(new InetSocketAddress(IPAddress, port), no_con_timeout);
            client.setSoTimeout(500);
            client.setTcpNoDelay(true);
            OutputStream out = client.getOutputStream();
            InputStream in = client.getInputStream();
            out.write(byteBuffer); // Send the encoded string to the server

            // Receive the same string back from the server
            int totalBytesRcvd = 0; // Total bytes received so far
            int bytesRcvd; // Bytes received in last read
            while (totalBytesRcvd < byteBuffer.length) {
                if ((bytesRcvd = in.read(byteBuffer, totalBytesRcvd,byteBuffer.length - totalBytesRcvd)) == -1)
                    throw new SocketException("Connection closed prematurely");

                totalBytesRcvd +=bytesRcvd;}



    }catch(IOException e)
    {
        e.printStackTrace();
    }

}
}

公共类Atx{
public void transmitAck（字符串msg、字符串ipAddress）引发IOException{
int no_con_timeout=10000；
int端口=25901；
试一试{
InetAddress IPAddress=InetAddress.getByName（IPAddress）；
byte[]byteBuffer=msg.getBytes（）；
套接字客户端=新套接字（）；
连接（新的InetSocketAddress（IP地址，端口），无超时）；
客户机设置时间（500）；
client.setTcpNoDelay（true）；
OutputStream out=client.getOutputStream（）；
InputStream in=client.getInputStream（）；
out.write（byteBuffer）；//将编码的字符串发送到服务器
//从服务器接收相同的字符串
int totalBytesRcvd=0；//到目前为止接收到的总字节数
int bytesRcvd；//上次读取时接收的字节数
while（总字节数小于字节缓冲长度）{
如果（（bytesRcvd=in.read（byteBuffer，totalBytesRcvd，byteBuffer.length-totalBytesRcvd））=-1）
抛出新的SocketException（“连接过早关闭”）；
totalBytesRcvd+=bytesRcvd；}
}捕获（IOE异常）
{
e、 printStackTrace（）；
}
}
}

---

请让我知道我做错了什么？非常感谢您的帮助

我通过在单独的线程上执行网络操作解决了这个问题 使用AsyncTask和doInBackground

有用的链接

---

您可以发布日志，显示您遇到的错误。我正在设备上测试，而不是在emmulator上测试

   public class Atx {


public void  transmitAck (String msg, String ipadress ) throws IOException {
    int no_con_timeout =10000;
    int port = 25901;


    try {
        InetAddress IPAddress =InetAddress.getByName(ipadress);
        byte[] byteBuffer =msg.getBytes();
            Socket client = new Socket();
            client.connect(new InetSocketAddress(IPAddress, port), no_con_timeout);
            client.setSoTimeout(500);
            client.setTcpNoDelay(true);
            OutputStream out = client.getOutputStream();
            InputStream in = client.getInputStream();
            out.write(byteBuffer); // Send the encoded string to the server

            // Receive the same string back from the server
            int totalBytesRcvd = 0; // Total bytes received so far
            int bytesRcvd; // Bytes received in last read
            while (totalBytesRcvd < byteBuffer.length) {
                if ((bytesRcvd = in.read(byteBuffer, totalBytesRcvd,byteBuffer.length - totalBytesRcvd)) == -1)
                    throw new SocketException("Connection closed prematurely");

                totalBytesRcvd +=bytesRcvd;}



    }catch(IOException e)
    {
        e.printStackTrace();
    }

}
}