A simple socket app in Android needs some special permissions to connect through the internet?

Question

Whats wrong with my code? It always get Exceptions when it tryes to connect to input text IP, or HOST.

package What.HTTPServer;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class WhatHTTPServerActivity extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button button = (Button)findViewById(R.id.button1);
        button.setOnClickListener(this);
    }

    public void onClick(View v) { 
            // TODO Auto-generated method stub

            TextView text = (TextView)findViewById(R.id.textView4);
            EditText textField = (EditText) findViewById(R.id.editText1); 

            if (textField.getText().toString().length() > 3)
            {
                String host = textField.getText().toString();
                String retorno = "";

                text.setTextColor(0xff0000ff);
                text.setText("Connecting...");

                try {
                    Socket s = new Socket(host, 80);                   
                    //outgoing stream redirect to socket
                    OutputStream out = s.getOutputStream();

                    PrintWriter output = new PrintWriter(out);
                      // send an HTTP request to the web server
                      output.println("GET / HTTP/1.1");
                      output.println("Host: " + host + ":80");
                      output.println("Connection: Close");
                      output.println();

                    BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));

                        // read the response
                          boolean loop = true;
                          StringBuilder sb = new StringBuilder(8096);
                          while (loop) {
                            if (in.ready()) {
                              int i = 0;
                              while (i != -1) {
                                i = in.read();
                                sb.append((char) i);
                              }
                              loop = false;
                            }
                          }
                          retorno = sb.toString();

                    //Close connection
                    s.close();

                    text.setTextColor(0xff0000ff);
                    text.setText("Your server runs: \n" 
                            + retorno );                    

                } catch (UnknownHostException e) {
                    // TODO Auto-generated catch block
                    text.setTextColor(0xffff0000);
                    text.setText("Error! The Host or IP is unknown." );
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    text.setTextColor(0xffff0000);
                    text.setText("Unknown error. Check your internet connection!" );
                }               

            } else {
                text.setTextColor(0xffff0000);
                text.setText("Error! Please type your host or IP" );
            }

    }     
}

Refer follow link ... This may helpful !!! http://stackoverflow.com/questions/8706464/defaulthttpclient-to-androidhttpclient — chain, Sep 03 '12 at 11:57
Possible duplicate of [Java socket IOException - permission denied](http://stackoverflow.com/questions/4074808/java-socket-ioexception-permission-denied) — Ciro Santilli OurBigBook.com, Mar 02 '16 at 10:25

score 6 · Accepted Answer · answered Jul 21 '11 at 14:57

6

Do you have

<uses-permission android:name="android.permission.INTERNET" />

in your manifest? Outside the application tags.

answered Jul 21 '11 at 14:57

David Olsson

8,085
3
30
38

score 0 · Answer 2 · answered Jul 21 '11 at 14:58

0

Any internet access from your application requires the internet acces permisison.

Android Permissions

The permission you want is called "INTERNET"

answered Jul 21 '11 at 14:58

Hamid

4,410
10
43
72

A simple socket app in Android needs some special permissions to connect through the internet?

2 Answers2

Linked