我想创建一个可以为服务器发送和接收数据的TCP客户端。我使用Hercules（TCP / UDP测试程序）作为服务器。我的代码可以发送字符串＆＃34;提交＆＃34;到服务器。我尝试让我的代码可以从Hercules接收数据，但它不起作用。我必须做什么来编辑它？
这是我的MainActivity代码
public class MainActivity extends Activity {
// Used to reference UI elements of main.xml
private TextView text,serverResponse;
private EditText ipBox;
private EditText portBox;
private ToggleButton connect;
private Button send;
private static final String TAG = "CClient";
private String ipAddress;
private Socket client;
private DataOutputStream outToServer;
private DataInputStream inFromServer;
private boolean connected = false;
private final int START = 0xffffff;
private final int msgBoxHint = START;
private final int appendText = START + 1;
Toast mytoast , savetoast;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
Log.d(TAG, "Here 1");
ipAddress = getLocalIpAddress();
Log.d(TAG, "Get local IP="+ ipAddress);
text = (TextView) findViewById(R.id.text);
ipBox = (EditText) findViewById(R.id.ipBox);
serverResponse = (TextView) findViewById(R.id.response);
portBox = (EditText) findViewById(R.id.portBox);
send = (Button) findViewById(R.id.send);
send.setOnClickListener(buttonsendOnClickListener);
connect = (ToggleButton) findViewById(R.id.connect);
connect.setOnClickListener(buttonConnectOnClickListener);
Button buttonExit = (Button) findViewById(R.id.btnExit);
buttonExit.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.d(TAG, "Exit");
Log.d(TAG, "Disconnect" );
if(client != null)
{
try {
client.close();
} catch (IOException e) {
Log.d(TAG, "Disconnect"+e.toString() );
}
}
finish();
}
});
}
OnClickListener buttonConnectOnClickListener = new OnClickListener() {
/** Manages all button clicks from the screen */
@TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override
public void onClick(View arg0) {
switch(arg0.getId())
{
case R.id.connect:
if(connect.isChecked())
{
Log.d(TAG, "Connect" );
EditText edIP = (EditText) findViewById(R.id.ipBox);
String ed_textIP = edIP.getText().toString().trim();
if(ed_textIP.isEmpty() || ed_textIP.length() == 0 || ed_textIP.equals("") || ed_textIP == null )
{
Toast.makeText(MainActivity.this, "IP Address or PORT is incorrect", Toast.LENGTH_SHORT).show();
Log.d(TAG, "IP Address or PORT is incorrect");
}
setValues(R.id.connect,true);
setValues(R.id.send,true);
setValues(R.id.ipBox,false);
String tMsg = welcomeMsg.toString();
MyClientTask myClientTask = new MyClientTask(ipBox
.getText().toString(), Integer.parseInt(portBox
.getText().toString()),
tMsg);
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
myClientTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
else
myClientTask.execute();
}
else
{ /*Toast.makeText(this, ipBox.getText(), Toast.LENGTH_LONG).show();*/
Log.d(TAG, "Disconnect" );
if(client != null)
{
try {
client.close();
} catch (IOException e) {
Log.d(TAG, "Disconnect"+e.toString() );
}
setText(R.id.text,"Press the connect button to start the client");
setText(msgBoxHint,"");
setValues(R.id.connect,false);
setValues(R.id.ipBox,true);
setValues(R.id.send,false);
}
else
{
setValues(R.id.connect,false);
}
}
break;
}
}
};
public class MyClientTask extends AsyncTask<Void, Void, Void> {
String dstAddress;
int dstPort;
String response = "";
String msgToServer;
MyClientTask(String addr, int port, String msgTo) {
dstAddress = addr;
dstPort = port;
msgToServer = msgTo;
}
protected Void doInBackground(Void... Arg0) {
Log.d(TAG, "InBackground");
Socket socket = null;
DataOutputStream outToServer = null;
DataInputStream inFromServer = null;
try {
client = new Socket(dstAddress, dstPort);
outToServer = new DataOutputStream(client.getOutputStream());
inFromServer = new DataInputStream(new BufferedInputStream(client.getInputStream())); // Input stream <- from server
}catch (UnknownHostException e) {
// TODO Auto-generated catch block
Log.d(TAG, "InBackground 1");
e.printStackTrace();
response = "UnknownHostException: " + e.toString();
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
mytoast = Toast.makeText(MainActivity.this, "Error UnknownHostException",
Toast.LENGTH_SHORT);
mytoast.show();
setValues(R.id.send,false);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
mytoast.cancel();
}
}, 500);
}
});
} catch (IOException e) {
Log.d(TAG, "InBackground 2");
// TODO Auto-generated catch block
e.printStackTrace();
response = "IOException: " + e.toString();
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
mytoast = Toast.makeText(MainActivity.this, "Error IOException",
Toast.LENGTH_SHORT);
mytoast.show();
setValues(R.id.connect,false);
setValues(R.id.send,false);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
mytoast.cancel();
}
}, 500);
}
});
}finally {
Log.d(TAG, "InBackground 3");
if (socket != null) {
try {
socket.close();
Log.d(TAG, "InBackground 3.11");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d(TAG, "InBackground 3.12");
}
}
Log.d(TAG, "InBackground 3.1");
}
Log.d(TAG, "InBackground 4");
return null;
}
@Override
protected void onPostExecute(Void result) {
serverResponse.setText(response);
super.onPostExecute(result);
}
}
OnClickListener buttonsendOnClickListener = new OnClickListener() {
/** Manages all button clicks from the screen */
@TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override
public void onClick(View arg0) {
switch(arg0.getId())
{
case R.id.send:
Log.d(TAG, "Sent" );
String sentence = "Submit";
String recieve = "";
serverResponse = (TextView) findViewById(R.id.response);
try {
outToServer = new DataOutputStream(client.getOutputStream());
inFromServer = new DataInputStream(new BufferedInputStream(client.getInputStream()));
Log.d(TAG, "Sent 1-1" );
if(sentence != null){
outToServer.writeUTF(sentence);
outToServer.flush();
}
/*
*
*
*
*
*
*/
Log.d(TAG, "Sent 1-2"+ recieve);
} catch (IOException e) {
setValues(R.id.ipBox,true);
setValues(R.id.connect,false);
setValues(R.id.send,false);
}
break;
}
}
};
private String getLocalIpAddress() {
Log.d(TAG, "Here 2");
WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
Log.d(TAG, "Here 3");
WifiInfo info = wifi.getConnectionInfo();
Log.d(TAG, "Here 4");
return Formatter.formatIpAddress(info.getIpAddress());
}
private void setText(int view, String content)
{
switch(view)
{
case R.id.ipBox: ipBox.setText(content); break;
case R.id.text: text.setText(content+"\n\n"); break;
case appendText: text.append(content+"\n\n"); break;
}
}
private void setValues(int view, boolean value)
{
switch(view)
{
case R.id.ipBox: ipBox.setEnabled(value); break;
case R.id.send: send.setEnabled(value); break;
case R.id.connect: connect.setChecked(value); break;
}
}
}
我想，我必须在buttonsendOnClickListener附近的/*****/.
答案 0 :(得分：0)
Do not work with sockets in main (gui) thread. Use AsyncTask!
Android fails if work with sockets in main (gui) thread.
Example:
new AsyncTask<Void, Void, Void>() {
@Override
protected void onPreExecute() {
super.onPreExecute();
// do in main thread before
}
@Override
protected Void doInBackground(Void... v) {
// do in thread, use sockets
return null;
}
@Override
protected void onPostExecute(Void v) {
super.onPostExecute(integer);
// do in main thread after
}
}.execute();
Learn about AsyncTask advance.