How to do a HTTP POST request in Android Studio?

Question

I'm trying to do a POST request in an android studio like this.

 btnSignin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {


            //submitForm();
            tryLogin("test@test.com", "Test1234");
        }
    });





protected void tryLogin(String mUsername, String mPassword)
 {
    HttpURLConnection connection;
    OutputStreamWriter request = null;

    URL url = null;
    String response = null;
    String parameters = "email="+mUsername+"&password="+mPassword;
    StrictMode.ThreadPolicy policy = new 
    StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);

    try
    {
        url = new URL("URL");
        connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        connection.setRequestMethod("POST");

        request = new OutputStreamWriter(connection.getOutputStream());
        request.write(parameters);
        request.flush();
        request.close();
        String line = "";
        InputStreamReader isr = new InputStreamReader(connection.getInputStream());
        BufferedReader reader = new BufferedReader(isr);
        StringBuilder sb = new StringBuilder();
        while ((line = reader.readLine()) != null)
        {
            sb.append(line + "\n");
        }
        // Response from server after login process will be stored in response variable.
        response = sb.toString();
        // You can perform UI operations here
        Toast.makeText(this,"Message from Server: \n"+ response, 0).show();
        isr.close();
        reader.close();

    }
    catch(IOException e)
    {
        // Error
    }

But the app crashes and I get an error like this -

FATAL EXCEPTION: main

Process: test, PID: 19928

android.os.NetworkOnMainThreadException at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:>1425)

at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:102)

I have added internet permission in the manifest file. Is this because I have not done it via AsyncTask? How can I fix this?

You can't perform network operations on main thread.. so you have to use asynctask — AbhayBohra, Aug 28 '17 at 05:29
use separate thread for network operation. asynctask is easy in this case — AAA, Aug 28 '17 at 05:29
it's recomended to use networking library such us [okhttp](https://github.com/square/okhttp), [retrofit](http://square.github.io/retrofit) or [volley](https://github.com/google/volley). It's easier to do network operation with networking library — zihadrizkyef, Aug 28 '17 at 05:30
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); **Add this 2 line before Try Block — Harshal Deshmukh, Aug 28 '17 at 05:39

AAA · Answer 1 · 2017-08-28T05:59:47.100

-1

you can put your network operation in this thread or use asynctask or any other library

new Thread(new Runnable() { 
            public void run(){        
            txt1.setText("Thread!!");
            }
        }).start();

edited Aug 28 '17 at 05:59

answered Aug 28 '17 at 05:32

AAA

485
6
23

How to do a HTTP POST request in Android Studio?

1 Answers1