我在android studio和客户端应用程序中有一个服务器应用程序。
虽然客户端能够连接到服务器，但我似乎无法将消息传递给客户端。我对网络概念很陌生，所以我会非常感激你的帮助。
我的主要活动类：
public class MainActivity extends Activity {
Server server;
TextView infoip, msg;
TextView usersTitle;
EditText userInput;
Button sendButton;
String[] array = {""};
public static ArrayList<String> lst;
ArrayAdapter<String> adapter;
ListView userList;
OutputStream outputStream;
int receivedPort;
InetAddress receivedIP;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
infoip = (TextView) findViewById(R.id.infoip);
msg = (TextView) findViewById(R.id.msg);
userInput = (EditText) findViewById(R.id.userInput);
sendButton = (Button) findViewById(R.id.sendButton);
usersTitle = (TextView) findViewById(R.id.usersTitle);
server = new Server(this);
infoip.setText(server.getIpAddress() + ":" + server.getPort());
userList = (ListView) findViewById(R.id.userList);
lst = new ArrayList<String>(Arrays.asList(array));
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, lst);
userList.setAdapter(adapter);
userList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String selected = userList.getItemAtPosition(position).toString();
msg.append("\n" + selected + " Client Port: " + receivedPort + " Client IP: " + receivedIP );
}
}
);
sendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final String input = userInput.getText().toString();
Socket socket = null;
try {
socket = new Socket("192.168.1.11",receivedPort);
outputStream = new ObjectOutputStream(socket.getOutputStream());
outputStream.write(input.getBytes());
msg.append(socket.getOutputStream().toString());
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
public int getClientPort(int port){
receivedPort = port;
return receivedPort;
}
public InetAddress getClientIP(InetAddress ip){
receivedIP = ip;
return receivedIP;
}
@Override
protected void onDestroy() {
super.onDestroy();
server.onDestroy();
}
}
我的服务器类：
public class Server {
MainActivity activity;
ServerSocket serverSocket;
String message = "";
static final int socketServerPORT = 8080;
public Server(MainActivity activity) {
this.activity = activity;
Thread socketServerThread = new Thread(new SocketServerThread());
socketServerThread.start();
}
public int getPort() {
return socketServerPORT;
}
public void onDestroy() {
if (serverSocket != null) {
try {
serverSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private class SocketServerThread extends Thread {
int count = 0;
@Override
public void run() {
try {
// create ServerSocket using specified port
serverSocket = new ServerSocket(socketServerPORT);
while (true) {
// block the call until connection is created and return
// Socket object
final Socket socket = serverSocket.accept();
count++;
message += " #" + count + " from " + socket.getInetAddress() + ":" + socket.getPort() + "\n"
+ " Host Name: " + socket.getInetAddress().getHostName() + "\n";
final String host = socket.getInetAddress().getHostName();
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
activity.msg.setText(message);
activity.lst.add(host);
activity.adapter.notifyDataSetChanged();
activity.usersTitle.setText("Connected Users (" + count + ")");
activity.getClientIP(socket.getInetAddress());
activity.getClientPort(socket.getPort());
}
});
SocketServerReplyThread socketServerReplyThread =
new SocketServerReplyThread(socket, count);
socketServerReplyThread.run();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private class SocketServerReplyThread extends Thread {
private Socket hostThreadSocket;
int cnt;
SocketServerReplyThread(Socket socket, int c) {
hostThreadSocket = socket;
cnt = c;
}
@Override
public void run() {
OutputStream outputStream;
String msgReply = " Hello from Server, you are #" + cnt;
try {
outputStream = hostThreadSocket.getOutputStream();
PrintStream printStream = new PrintStream(outputStream);
printStream.print(msgReply);
printStream.close();
message += " replied: " + msgReply + "\n";
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
activity.msg.setText(message);
}
});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
message += " Something wrong! " + e.toString() + "\n";
}
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
activity.msg.setText(message);
}
});
}
}
public String getIpAddress() {
String ip = "";
try {
Enumeration<NetworkInterface> enumNetworkInterfaces = NetworkInterface
.getNetworkInterfaces();
while (enumNetworkInterfaces.hasMoreElements()) {
NetworkInterface networkInterface = enumNetworkInterfaces
.nextElement();
Enumeration<InetAddress> enumInetAddress = networkInterface
.getInetAddresses();
while (enumInetAddress.hasMoreElements()) {
InetAddress inetAddress = enumInetAddress
.nextElement();
if (inetAddress.isSiteLocalAddress()) {
ip += " Server running at : " + inetAddress.getHostAddress();
}
}
}
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
ip += " Something Wrong! " + e.toString() + "\n";
}
return ip;
}
}
我的客户主要活动：
public class MainActivity extends Activity {
TextView response;
EditText editTextAddress, editTextPort;
Button buttonConnect, buttonClear, callClass;
Intent intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editTextAddress = (EditText) findViewById(R.id.addressEditText);
editTextPort = (EditText) findViewById(R.id.portEditText);
response = (TextView) findViewById(R.id.responseTextView);
buttonConnect = (Button) findViewById(R.id.connectButton);
buttonClear = (Button) findViewById(R.id.clearButton);
callClass = (Button) findViewById(R.id.callClass);
callClass.setOnClickListener(
new Button.OnClickListener() {
public void onClick (View v){
intent = new Intent(MainActivity.this, ClientInterface.class);
startActivity(intent);
finish();
}
} );
buttonConnect.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Client myClient = new Client("192.168.1.13", 8080, response);
myClient.execute();
}
});
buttonClear.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
response.setText("");
}
});
}
}
My Client class:
package com.example.seth.chat4all_client;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import android.os.AsyncTask;
import android.widget.TextView;
public class Client extends AsyncTask<Void, Void, Void> {
String dstAddress;
int dstPort;
String response = "";
TextView textResponse;
Client(String addr, int port, TextView textResponse) {
dstAddress = addr;
dstPort = port;
this.textResponse = textResponse;
}
@Override
protected Void doInBackground(Void... arg0) {
Socket socket = null;
try {
socket = new Socket(dstAddress, dstPort);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(
1024);
byte[] buffer = new byte[1024];
int bytesRead;
InputStream inputStream = socket.getInputStream();
/*
* notice: inputStream.read() will block if no data return
*/
while ((bytesRead = inputStream.read(buffer)) != -1) {
byteArrayOutputStream.write(buffer, 0, bytesRead);
response += byteArrayOutputStream.toString("UTF-8");
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
response = "UnknownHostException: " + e.toString();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
response = "IOException: " + e.toString();
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
textResponse.setText(response);
super.onPostExecute(result);
}
}
当消息发送到客户端时，我收到以下错误消息：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.seth.chat4all, PID: 9296
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
at libcore.io.IoBridge.connect(IoBridge.java:122)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
at java.net.Socket.startupSocket(Socket.java:590)
at java.net.Socket.tryAllAddresses(Socket.java:128)
at java.net.Socket.<init>(Socket.java:178)
at java.net.Socket.<init>(Socket.java:150)
at com.example.seth.chat4all.MainActivity$2.onClick(MainActivity.java:83)
at android.view.View.performClick(View.java:4789)
at android.view.View$PerformClick.run(View.java:19881)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5294)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
答案 0 :(得分：-1)
您正在尝试在主线程上进行网络连接，这将阻止任何UI操作， 请参阅How to fix android.os.NetworkOnMainThreadException?了解此
的解决方案