我有一个 android 套接字服务器，它只是在启动时向客户端发送“hello”。每次单击按钮时，我都需要发送“你好”。我添加了按钮的代码，在while循环中，应用程序崩溃了。请帮助（我不想显示传入的数据）
public class MainActivity extends Activity {
TextView textView1;
final Button b1 = (Button) findViewById(R.id.button1);
static String SERVER_IP;
static final int SERVER_PORT = 5000;
Handler handler = new Handler();
ServerSocket serverSocket;
//---get the local IPv4 address---
public String getLocalIpv4Address() {
try {
for (Enumeration<NetworkInterface> networkInterfaceEnum = NetworkInterface
.getNetworkInterfaces(); networkInterfaceEnum
.hasMoreElements();) {
NetworkInterface networkInterface = networkInterfaceEnum
.nextElement();
for (Enumeration<InetAddress> ipAddressEnum = networkInterface
.getInetAddresses(); ipAddressEnum.hasMoreElements();) {
InetAddress inetAddress = (InetAddress) ipAddressEnum
.nextElement();
// ---check that it is not a loopback address and
// it is IPv4---
if (!inetAddress.isLoopbackAddress()
&& InetAddressUtils.isIPv4Address(inetAddress
.getHostAddress())) {
return inetAddress.getHostAddress();
}
}
}
} catch (SocketException ex) {
Log.e("IPAddress", ex.toString());
}
return null;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//---make the TextView scrollable---
textView1 = (TextView) findViewById(R.id.textView1);
textView1.setMovementMethod(new ScrollingMovementMethod());
}
public class ServerThread implements Runnable {
public void run() {
try {
if (SERVER_IP != null) {
handler.post(new Runnable() {
@Override
public void run() {
textView1.setText(textView1.getText()
+ "Server listening on IP: " + SERVER_IP
+ "\n");
}
});
//---create an instance of the server socket---
serverSocket = new ServerSocket(SERVER_PORT);
while (true) {
//---wait for incoming clients---
Socket client = serverSocket.accept();
//---the above code is a blocking call;
// i.e. it will block until a client connects---
//---client has connected---
handler.post(new Runnable() {
@Override
public void run() {
textView1.setText(textView1.getText()
+ "Connected to client." + "\n");
}
});
try {
//---get an InputStream object to read from the
// socket---
//DataInputStream dataInputStream=new DataInputStream(client.getInputStream());
//String line=dataInputStream.toString();
//textView1.setText(line);
final DataOutputStream dataOutputStream = new DataOutputStream(client.getOutputStream());
dataOutputStream.writeChars("hello");
/*BufferedReader br = new BufferedReader(
new InputStreamReader(
client.getInputStream()));
OutputStream outputStream =
client.getOutputStream();
//---read all incoming data terminated with a \n
// char---
//String line = null;
//while ((line = br.readLine()) != null) {
//final String strReceived = line;
//---send whatever you received back to the
// client---
//String s = line + "\n";
//DataOutputStream saj=new DataOutputStream();
//outputStream.write(s.getBytes());
/*handler.post(new Runnable() {
@Override
public void run() {
textView1.setText(textView1.getText()
+ strReceived + "\n");
}
});*/
//br.close();
//}
//---client has disconnected from the server---
handler.post(new Runnable() {
@Override
public void run() {
textView1.setText(textView1.getText()
+ "Client disconnected." + "\n");
}
});
} catch (Exception e) {
final String error = e.getLocalizedMessage();
handler.post(new Runnable() {
@Override
public void run() {
textView1.setText(textView1.getText()
+ error);
}
});
}
}
} else {
handler.post(new Runnable() {
@Override
public void run() {
textView1.setText(textView1.getText()
+ "No internet connection on device."
+ "\n");
}
});
}
} catch (Exception e) {
final String error = e.getLocalizedMessage();
handler.post(new Runnable() {
@Override
public void run() {
textView1.setText(textView1.getText() + error + "\n");
}
});
}
handler.post(new Runnable() {
@Override
public void run() {
textView1.setText(textView1.getText() + "\n" + "Server exited"
+ "\n");
}
});
}
}
@Override
protected void onStart() {
super.onStart();
//---get the IP address of itself---
SERVER_IP = getLocalIpv4Address();
//---start the server---
Thread serverThread = new Thread(new ServerThread());
serverThread.start();
}
@Override
protected void onStop() {
super.onStop();
try {
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}