android AsyncTask doInBackground(Void... params)中new socket抛出异常

[银河小分队]

package com.example.socketapp;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	EditText ip;
	EditText editText;
	TextView text;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	
		ip=(EditText)findViewById(R.id.ip);
		editText=(EditText)findViewById(R.id.editText);
		text=(TextView)findViewById(R.id.textView2);
		
		findViewById(R.id.connect).setOnClickListener(new OnClickListener() {
			
			public void onClick(View v) {
				connect();
				
			}
		});
		
		findViewById(R.id.send).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				send();
			}
		});

	}
	
	
	//---------------------------
	
	BufferedReader reader=null;
	BufferedWriter writer=null;
	Socket socket= null;
	public void connect(){
		try {
			AsyncTask<Void, String, Void> read=new AsyncTask<Void, String, Void>(){

				@Override
				protected Void doInBackground(Void... params) {
					try {
					socket= new Socket(ip.getText().toString(),5000);
					writer=new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
					reader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
					String line;
					publishProgress("@success");
						while ((line=reader.readLine())!=null) {
							publishProgress(line);
						}
					} catch (IOException e) {
 						e.printStackTrace();
					}
					return null;
				}
				
				@Override
				protected void onProgressUpdate(String... values) {
					if (values[0].equals("@success")) {
						Toast.makeText(MainActivity.this, "连接成功 ", Toast.LENGTH_SHORT).show();
					} 
					text.append(values[0]);
					super.onProgressUpdate(values);
				}
			};
			read.execute();
		
		} catch (Exception e) {
			Toast.makeText(MainActivity.this, "连接失败 ", Toast.LENGTH_SHORT).show();
			e.printStackTrace();
		}
		
		
		
		
	}
	
	public void send(){
		try {
			writer.write(editText.getText().toString()+"\n");
			writer.flush();
			editText.setText("");
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	
	
	@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 boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}

在进入异步线程中，new socke直接抛出异常，请大家指教？eclicpes的错误提示无

[寒冰大神]

public Socket(InetAddress dstAddress, int dstPort) throws IOException { this(); checkDestination(dstAddress, dstPort); startupSocket(dstAddress, dstPort, null, 0, true); } 这个方法本来就抛出异常的啊，tyr{}catch(){} 处理了就行了。你这有错吗？

[银河小分队]

能具体说明一下吗？