[英]connecting to socket over wifi - android
我正在尝试使用Android
套接字通过wifi连接到我的本地网络中ip
为some_ip
的计算机上的某些UDP
端口( some_port
)。
当我跑步
socket = new Socket(some_ip, some_port);
我没有收到任何消息错误,但该程序似乎无法读取此行,而在try/catch
周围时,我无法记录该错误。
我该如何调试?
编辑1:这是我的try/catch
try{
socket = new Socket(some_ip, some_port);
}
catch(ConnectException e) {
e.printStackTrace();
}
编辑2:这是完整的代码
private void getUDPData() throws IOException {
class ProcessUPDTask extends AsyncTask<String, Void, Socket> {
private Exception exception;
private Socket socket;
public ProcessUPDTask() throws IOException {
}
private void runThread(){
new Thread() {
public void run() {
Toast.makeText(activity, "Own Message", Toast.LENGTH_LONG).show();
}
}.start();
}
protected Socket doInBackground(String... urls) {
try {
try{
socket = new Socket(some_ip, some_port);
socket.setSoTimeout(1500);
}
catch(IOException e) {
e.printStackTrace();
}
Log.d("TAG","this line is reached");
while(true){
try {
dataInputStream = new DataInputStream(socket.getInputStream());
dataOutputStream = new DataOutputStream(socket.getOutputStream());
System.out.println("ip: " + socket.getInetAddress());
System.out.println("message: " + dataInputStream.readUTF());
dataOutputStream.writeUTF("Hello!");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
if( socket!= null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if( dataInputStream!= null){
try {
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if( dataOutputStream!= null){
try {
dataOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
} catch (Exception e) {
this.exception = e;
e.printStackTrace();
return null;
}
}
protected void onPostExecute(Socket socket) {
// TODO: check this.exception
// TODO: do something with the feed
}
}
new ProcessUPDTask().execute();
}
尝试这个
try {
Socket socket = new Socket(IP_ADDRESS, PORT);
socket.setSoTimeout(1500);
} catch (IOException ex) {
Log.e("Connection Error",String.valueOf(ex));
}
以此替换代码,等待几秒钟(现在为60秒),您会看到错误提示。
private void getUDPData() throws IOException {
class ProcessUPDTask extends AsyncTask<String, Void, Socket> {
private Exception exception;
private Socket socket;
public ProcessUPDTask() throws IOException {
}
protected Socket doInBackground(String... urls) {
try {
try {
socket = new Socket("192.168.1.101", 1234);
socket.setSoTimeout(1500);
} catch (IOException e) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, "Error", Toast.LENGTH_LONG).show();
}
});
}
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, "Reached", Toast.LENGTH_LONG).show();
}
});
while (true) {
try {
dataInputStream = new DataInputStream(socket.getInputStream());
dataOutputStream = new DataOutputStream(socket.getOutputStream());
System.out.println("ip: " + socket.getInetAddress());
System.out.println("message: " + dataInputStream.readUTF());
dataOutputStream.writeUTF("Hello!");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataInputStream != null) {
try {
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataOutputStream != null) {
try {
dataOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
} catch (Exception e) {
this.exception = e;
e.printStackTrace();
return null;
}
}
protected void onPostExecute(Socket socket) {
// TODO: check this.exception
// TODO: do something with the feed
}
}
new ProcessUPDTask().execute();
}
您可以配置它并在连接之间使用transData()。
private void transData(int sending_msg_int) throws IOException {
String sending_msg = Integer.toString(sending_msg_int);
SocketAddress socketAddress = new InetSocketAddress(ip, Data.Port);
DatagramSocket ds = new DatagramSocket();
byte[] buffer = sending_msg.getBytes();
DatagramPacket dp = new DatagramPacket(buffer, buffer.length,
socketAddress);
ds.send(dp);
ds.close();
}
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