当我使用 wifi 模块在计算机和 android 设备之间发送/接收数据时遇到问题。我的电脑可以发送/接收来自 android 的数据，但 android 设备无法从电脑接收数据，它只能发送什么问题？我将计算机设置为 TCP Server，而 android 是 TCP Client。我认为它在 DataInputStrem 中出错，但我不知道如何解决。
public class TCPClient {
private String serverMessage;
public static final String SERVERIP = "192.168.0.1"; //your computer IP address
public static final int SERVERPORT = 6000;
private OnMessageReceived mMessageListener = null;
private boolean mRun = false;
DataOutputStream out;
DataInputStream in;
/**
* Constructor of the class. OnMessagedReceived listens for the messages received from server
*/
public TCPClient(OnMessageReceived listener) {
mMessageListener = listener;
}
/**
* Sends the message entered by client to the server
* @param message text entered by client
*/
public void sendMessage(String message){
if (out != null) {
try {
out.writeUTF(message);
out.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void stopClient(){
mRun = false;
}
public void run() {
mRun = true;
try {
//here you must put your computer's IP address.
InetAddress serverAddr = InetAddress.getByName(SERVERIP);
Log.e("TCP Client", "C: Connecting...");
//create a socket to make the connection with the server
Socket socket = new Socket(serverAddr, SERVERPORT);
try {
//send the message to the server
out = new DataOutputStream(socket.getOutputStream());
Log.e("TCP Client", "C: Sent.");
Log.e("TCP Client", "C: Done.");
//receive the message which the server sends back
in = new DataInputStream(socket.getInputStream());
Log.e("TCP Client x", in.readUTF());
//in this while the client listens for the messages sent by the server
while (mRun) {
serverMessage = in.readUTF();
if (serverMessage != null && mMessageListener != null) {
//call the method messageReceived from MyActivity class
mMessageListener.messageReceived(serverMessage);
}
serverMessage = null;
}
Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + serverMessage + "'");
} catch (Exception e) {
Log.e("TCP", "S: Error", e);
} finally {
//the socket must be closed. It is not possible to reconnect to this socket
// after it is closed, which means a new socket instance has to be created.
socket.close();
}
} catch (Exception e) {
Log.e("TCP", "C: Error", e);
}
}
//Declare the interface.
//class at on asynckTask doInBackground
public interface OnMessageReceived {
public void messageReceived(String message);
}
}