package com.example.chatactivity;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements Runnable {
private EditText ipaddr;
private EditText recvmsg;
private EditText sendmsg;
private Button send;
private Button start;
private Button stop;
private String ip;
private String sendtext;
private String recvtext;
Socket socket;
Thread thread;
DataInputStream in;
DataOutputStream out;
@ Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_main);
ipaddr = (EditText) findViewById (R.id.iptext);
recvmsg = (EditText) findViewById (R.id.recvtext);
sendmsg = (EditText) findViewById (R.id.sendtext);
send = (Button) findViewById (R.id.send);
start = (Button) findViewById (R.id.start);
stop = (Button) findViewById (R.id.stop);
stop.setEnabled (false);
send.setEnabled (false);
start.setOnClickListener (new View.OnClickListener () {
@ Override
public void onClick (View v) {
/ / TODO Auto-generated method stub
ip = ipaddr.getText () toString ();.
thread = new Thread (MainActivity.this);
thread.start ();
/ / Start.setEnabled (false);
/ / Stop.setEnabled (true);
/ / Send.setEnabled (true);
}
});
send.setOnClickListener (new View.OnClickListener () {
@ Override
public void onClick (View v) {
/ / TODO Auto-generated method stub
sendtext = sendmsg.getText () toString ();.
if (sendtext! = null) {
try {
out.writeUTF (sendtext);
} Catch (IOException e) {
/ / TODO Auto-generated catch block
e.printStackTrace ();
}
}
}
});
stop.setOnClickListener (new View.OnClickListener () {
@ Override
public void onClick (View v) {
/ / TODO Auto-generated method stub
try {
in.close ();
out.close ();
socket.close ();
} Catch (IOException e) {
/ / TODO Auto-generated catch block
e.printStackTrace ();
}
stop.setEnabled (false);
start.setEnabled (true);
send.setEnabled (true);
}
});
}
@ Override
public boolean onCreateOptionsMenu (Menu menu) {
/ / Inflate the menu; this adds items to the action bar if it is present
.getMenuInflater () inflate (R.menu.main, menu);.
return true;
}
@ Override
public void run () {
/ / TODO Auto-generated method stub
try {
socket = new Socket (ip, 8000);
in = new DataInputStream (socket.getInputStream ());
out = new DataOutputStream (socket.getOutputStream ());
} Catch (UnknownHostException e) {
/ / TODO Auto-generated catch block
e.printStackTrace ();
/ / Toast.makeText (this, "host name could not be resolved into an IP address", Toast.LENGTH_SHORT);
} Catch (IOException e) {
/ / TODO Auto-generated catch block
e.printStackTrace ();
}
while (true) {
try {
recvtext = in.readUTF ();
mHandler.sendMessage (mHandler.obtainMessage ());
} Catch (IOException e) {
/ / TODO Auto-generated catch block
e.printStackTrace ();
}
}
}
Handler mHandler = new Handler () {
public void handleMessage (Message msg) {
recvmsg.append (recvtext);
super.handleMessage (msg);
}
};
}
Always Rom server, and point start button the program in a virtual machine error stop<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
Reply:
Network operations in the sub-thread to do, not on the main UI thread.
Reply:
The main thread in just declare and define the socket number of variables, the new thread to accept it, so not okay
Reply:
Wrong, sorry
Two suggestions:
1 The best debugging on a real machine.
2.3 edittext short pointer before using no judgment, easily lead to a null pointer exception. You look at the application hang is not the reason.
Reply:
I'm just learning , also does not see Logcat, I would first try is not a null pointer problemReply:
Reply:
debug will do
Reply:
less likely to debug, ipaddr filled after the IP address text box, click the start button, the program socket = new Socket (ip, 8000); execution unit anymore. Do not fill ipaddr text box, program execution to in = new DataInputStream (socket.getInputStream ()); do not go, socket is null
Reply:
Try udx agreement, http://www.goodudx.com/web/index.php/site/download/25, security desk Development Kit.
Reply:
socket = new Socket (ip, 8000);
in = new DataInputStream (socket.getInputStream ());
out = new DataOutputStream (socket.getOutputStream ());
This change
socket = new Socket ();
socket.connect (new InetSocketAddress (ip, 8000));
in = new DataInputStream (socket.getInputStream ());
out = new DataOutputStream (socket.getOutputStream ());
Then put this thread inside it.
while (true) {
try {
recvtext = in.readUTF ();
mHandler.sendMessage (mHandler.obtainMessage ());
} Catch (IOException e) {
/ / TODO Auto-generated catch block
e.printStackTrace ();
}
This code has a loophole, if an exception that should exit the loop, reconnect socket
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