Why isn't android connecting to my web server

Question

   package com.mohd.tryapp;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.TextView;

import java.net.URL;
import java.net.URLConnection;


public class MainActivity extends ActionBarActivity {

    public static int flag;
    TextView view;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
        view=(TextView)findViewById(R.id.textvi);
        getFlag var=new getFlag();
        var.execute();
        if(flag==1)
            view.setText("true");
        else
            view.setText("false");


    }
    class getFlag extends AsyncTask<Void, Void, Void> {

        private Exception exception;


        @Override
        protected Void doInBackground(Void... params) {
            try{
                String url="http://mohdgadi.netai.net/Register.php";
                int timeout=15*1000;
                URL myUrl = new URL(url);
                URLConnection connection = myUrl.openConnection();
                connection.setConnectTimeout(timeout);
                connection.connect();
                flag=1;
            } catch (Exception e) {
                e.printStackTrace();
                flag=0;
            }

            return null;

        }

    }
}

So this is the code for my main activity i want to connect to my 000webhost website but the connection always shows false.I even tried changing the url to http://mohdgadi.netai.net/Register but that doesnt seem to work what might be the problem because of which the result is always showing false

score 2 · Answer 1 · edited May 23 '17 at 11:54

2

This is because, if you see the logs, you will notice that your code will throw a NetworkOnMainThreadException. This means that Android doesn't allow you to make a Network call on the main thread. Therefore, move your code into an AsyncTask.

You can see an example here.

You should use get() to wait for the result to get populated, although it is preferred that you use onPostExecute to execute your code after doInBackground returns.

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
        view=(TextView)findViewById(R.id.textvi);
        getFlag var=new getFlag();
        var.execute();
        var.get();
        if(flag==1)
            view.setText("true");
        else
            view.setText("false");


    }

edited May 23 '17 at 11:54

Community

1
1

answered Dec 03 '15 at 04:59

Eric B.

4,622
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ok so I made changes to my code as u said look at my edited code but still its giving me false – sharin gan Dec 03 '15 at 05:18
This is because you are accessing the value before the flag is set. I have edited my answer, see it. – Eric B. Dec 03 '15 at 05:27
Still false why cant i connect :( – sharin gan Dec 03 '15 at 05:34
Have you included the `INTERNET` permission in manifest file? – Eric B. Dec 03 '15 at 05:35
yes i have included ,I need a favour can u write a simple code to connect to google.com given method above in asynctask – sharin gan Dec 03 '15 at 05:37
You can find an example at the android developer docs. http://developer.android.com/training/basics/network-ops/connecting.html – Eric B. Dec 03 '15 at 05:45

Why isn't android connecting to my web server

1 Answers1