我正在尝试在C＃TCP服务器和Android TCP客户端之间进行通信。我是android的新手所以使用本教程的第二部分来创建android客户端： http://www.myandroidsolutions.com/2012/07/20/android-tcp-connection-tutorial/#.V8uZISgrKUk
一切正常，我可以在手机和计算机之间发送短信，但本教程要求客户端应用程序将服务器IP硬编码到程序中，并且由于显而易见的原因，这将导致问题，如果我其实想制作一个使用它的应用程序。
在本教程之外，我添加了第二个EditText（＆＃34; @ id / ipTxt＆＃34;）和第二个按钮（＆＃34; @ id / setIp＆＃34;）
由于我不想让任何人阅读整个教程，以下是总结的重要部分：
主要活动：
public class MyActivity extends Activity
{
private ListView mList;
private ArrayList<String> arrayList;
private MyCustomAdapter mAdapter;
private TCPClient mTcpClient;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
arrayList = new ArrayList<String>();
final EditText editText = (EditText) findViewById(R.id.editText);
Button send = (Button)findViewById(R.id.send_button);
//relate the listView from java to the one created in xml
mList = (ListView)findViewById(R.id.list);
mAdapter = new MyCustomAdapter(this, arrayList);
mList.setAdapter(mAdapter);
// connect to the server
new connectTask().execute("");
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String message = editText.getText().toString();
//add the text in the arrayList
arrayList.add("c: " + message);
//sends the message to the server
if (mTcpClient != null) {
mTcpClient.sendMessage(message);
}
//refresh the list
mAdapter.notifyDataSetChanged();
editText.setText("");
}
});
}
public class connectTask extends AsyncTask<String,String,TCPClient> {
@Override
protected TCPClient doInBackground(String... message) {
//we create a TCPClient object and
mTcpClient = new TCPClient(new TCPClient.OnMessageReceived() {
@Override
//here the messageReceived method is implemented
public void messageReceived(String message) {
//this method calls the onProgressUpdate
publishProgress(message);
}
});
mTcpClient.run();
return null;
}
@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
//in the arrayList we add the messaged received from server
arrayList.add(values[0]);
// notify the adapter that the data set has changed. This means that new message received
// from server was added to the list
mAdapter.notifyDataSetChanged();
}
}
}
TCPClient类：
public class TCPClient {
private String serverMessage;
public static final String SERVERIP = "192.168.0.102"; //your computer IP address
public static final int SERVERPORT = 4444;
private OnMessageReceived mMessageListener = null;
private boolean mRun = false;
PrintWriter out;
BufferedReader 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 && !out.checkError()) {
out.println(message);
out.flush();
}
}
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 PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
Log.e("TCP Client", "C: Sent.");
Log.e("TCP Client", "C: Done.");
//receive the message which the server sends back
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//in this while the client listens for the messages sent by the server
while (mRun) {
serverMessage = in.readLine();
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. The method messageReceived(String message) will must be implemented in the MyActivity
//class at on asynckTask doInBackground
public interface OnMessageReceived {
public void messageReceived(String message);
}
}
我的理论是每次＆＃34; setIp＆＃34;停止connectTask进程。单击按钮并创建一个新按钮，但这似乎是一种非常低效的方式，而且我不知道如何做到这一点：（
任何想法？
答案 0 :(得分：0)
将您的SERVERIP和SERVERPORT常量改为非静态变量，然后使用其他输入值将其初始化为TCPClient构造函数，或作为{{1}的输入参数}（然后将其作为输入参数传递给您的AsyncTask.execute()方法）。
在您首次从应用程序的存储配置或UI中的用户确定这些值之前，请不要致电doInBackground()。
当您开始新任务时，将对象保存到主代码中的变量（您当前没有这样做）。要取消连接，您可以在该变量上调用execute()方法。请确保您的AsyncTask.cancel()和connectTask.doInBackground()代码定期检查TCPClient.run()方法，以便在返回true时尽快退出。 AsyncTask documentation中提到了这种技术。
AsyncTask.isCancelled()对象运行完毕后，您可以创建一个具有不同输入值的新对象。