Sending Http Post Request with Android

Sending POST data in Android

Note (Oct 2020): AsyncTask used in the following answer has been deprecated in Android API level 30. Please refer to Official documentation or this blog post for a more updated example

Updated (June 2017) Answer which works on Android 6.0+. Thanks to @Rohit Suthar, @Tamis Bolvari and @sudhiskr for the comments.

    public class CallAPI extends AsyncTask<String, String, String> {
    
        public CallAPI(){
            //set context variables if required
        }
    
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }
    
         @Override
         protected String doInBackground(String... params) {
            String urlString = params[0]; // URL to call
            String data = params[1]; //data to post
            OutputStream out = null;

            try {
                URL url = new URL(urlString);
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                out = new BufferedOutputStream(urlConnection.getOutputStream());

                BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out, "UTF-8"));
                writer.write(data);
                writer.flush();
                writer.close();
                out.close();

                urlConnection.connect();
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }
        }
    }

References:

• https://developer.android.com/reference/java/net/HttpURLConnection.html
• How to add parameters to HttpURLConnection using POST using NameValuePair

Original Answer (May 2010)

Note: This solution is outdated. It only works on Android devices up to 5.1. Android 6.0 and above do not include the Apache http client used in this answer.

Http Client from Apache Commons is the way to go. It is already included in android. Here's a simple example of how to do HTTP Post using it.

public void postData() {
    // Create a new HttpClient and Post Header
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");

    try {
        // Add your data
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
        nameValuePairs.add(new BasicNameValuePair("id", "12345"));
        nameValuePairs.add(new BasicNameValuePair("stringdata", "Hi"));
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        // Execute HTTP Post Request
        HttpResponse response = httpclient.execute(httppost);
        
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
    } catch (IOException e) {
        // TODO Auto-generated catch block
    }
} 

How to send http post request from Android?

I am using this code and working as well. Try this code.

public static String httpPostRequest(Context context, String url, String email) {
        String response = "";
        BufferedReader reader = null;
        HttpURLConnection conn = null;
        try {
            LogUtils.d("RequestManager", url + " ");
            LogUtils.e("data::", " " + data);
            URL urlObj = new URL(url);

            conn = (HttpURLConnection) urlObj.openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());

            data += "&" + URLEncoder.encode("Email", "UTF-8") + "="
                    + URLEncoder.encode(email, "UTF-8");

            wr.write(data);
            wr.flush();

            LogUtils.d("post response code", conn.getResponseCode() + " ");

            int responseCode = conn.getResponseCode();

            reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line = null;

            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }

            response = sb.toString();
        } catch (Exception e) {
            e.printStackTrace();
            LogUtils.d("Error", "error");
        } finally {
            try {
                reader.close();
                if (conn != null) {
                    conn.disconnect();
                }
            } catch (Exception ex) {
            }
        }
        LogUtils.d("RESPONSE POST", response);
        return response;
    }

Sending POST request in android studio

to answer your question #3 would suggest using a library like OkHTTP to make that post request. That will make your code way simpler and easier to debug.

Make sure you have the following permissions on your Manifest:

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

Add the library to your gradle file:

compile 'com.squareup.okhttp3:okhttp:3.10.0'

Then, change your onCreate method to the following:

private final OkHttpClient client = new OkHttpClient();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_events_create);

    ActionBar actionBar = this.getSupportActionBar();
    actionBar.setTitle("Test");
    actionBar.setDisplayHomeAsUpEnabled(true);

    makePost();
}

private void makePost(){
    RequestBody requestBody = new MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("email", "your-email@email.com")
        .addFormDataPart("name", "your-name")
        .build();

    request = new Request.Builder()
        .url("http://myip/task_manager/v1/register")
        .post(requestBody)
        .build();

    try (Response response = client.newCall(request).execute()) {
        if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

      Headers responseHeaders = response.headers();
      for (int i = 0; i < responseHeaders.size(); i++) {
        System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
      }

      System.out.println(response.body().string());
   }
}

And this should make a post request to your endpoint.

If you wanna log it, you can just add a logging interceptor to it.

Hope this helps you out!

Sending HTTP Post Request with Android

You can use Http Client from Apache Commons. For example:

private class PostTask extends AsyncTask<String, String, String> {
  @Override
  protected String doInBackground(String... data) {
    // Create a new HttpClient and Post Header
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://<ip address>:3000");

    try {
      //add data
      List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
      nameValuePairs.add(new BasicNameValuePair("data", data[0]));
      httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
      //execute http post
      HttpResponse response = httpclient.execute(httppost);

    } catch (ClientProtocolException e) {

    } catch (IOException e) {

    }
  }
}

UPDATE

You can use Volley Android Networking Library to post your data. Official document is here.

I personally use Android Asynchronous Http Client for few REST Client projects.

Other tool that good to explore is Retrofit.

Android Emulator - How to send a http post request to it?

You can set a redirect port from your host machine to your app's listening port. For instance if your app is listening on port 8080, then you can use set the redir as follows:

telnet localhost 5554

Then once you are authorized, enter

redir add tcp:8080:8080

Now any request sent on your local machine's localhost:8080 will be sent your emulator's localhost:8080. Now you can use Postman to send a request on localhost:8080 on your local machine.

Simplest way to send HTTP GET and POST requests in Android, for my app's purposes

There is some cleaner and better approaches. You can use lots of libraries for this purpose.

Volley

Retrofit

These two are some of best libraries for calling webservise apis and I recommend Retrofit because it keeps your codes more clean and reusable.

Can't send a correct POST request in Java (Android Studio)

I have just tried to create an User and it worked. You can refresh the link u have shared to check the created User.

This is what I have tried

String endPoint= "https://safe-citadel-91138.herokuapp.com/questions";
        try {

            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost post = new HttpPost(endPoint);
            post.addHeader("Content-Type", "application/json");
            JSONObject obj = new JSONObject();

            obj.put("firstName", "TESTF");
            obj.put("lastName", "TESTL");
            obj.put("email", "support@mlab.com");

            StringEntity entity = new StringEntity(obj.toString()); 
            post.setEntity(entity);
            HttpResponse response = httpClient.execute(post);
}catch (Exception e){

        }

UPDATE

BTW I have used json jar from this link

Example of POST request in Android studio

Use Volley as defined here. It's far more easier.

HTTP POST Request as a different Java Class - Android Studio

your con use feature interface

   public class HTTPReq {
    public void postRequest(final HashMap<String, String> params, final Context context, final ResponseCallBack callBack) {
        RequestQueue requestQueue = Volley.newRequestQueue(context);
        String url = "https://reqres.in/api/login";
        StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {

            @Override
            public void onResponse(String response) {
                callBack.onResponse(response);
                Toast.makeText(context, response, Toast.LENGTH_LONG).show();

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                callBack.onError(error);
                Toast.makeText(context, "Response Failed", Toast.LENGTH_LONG).show();
            }
        }) {
            @Override
            protected Map<String, String> getParams() {
                return params;
            }

            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> params = new HashMap<String, String>();
                params.put("Content-Type", "application/x-www-form-urlencoded");
                return params;
            }
        };

        requestQueue.add(stringRequest);

    }
}

calss interface :

import com.android.volley.VolleyError;

public interface ResponseCallBack<T> {
        public void onResponse(T response);

        public void onError(VolleyError error_response);

}

MainActivity:

public class MainActivity extends AppCompatActivity implements ResponseCallBack {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    HTTPReq httpReq = new HTTPReq();
    HashMap<String, String> credentials = new HashMap<String, String>();
    credentials.put("email", "eve.holt@reqres.in");
    credentials.put("password", "cityslicka");

    httpReq.postRequest(credentials, this, this);

}

@Override
public void onResponse(Object response) {
    Log.e("TAG", "onResponse: " + response);
}

@Override
public void onError(VolleyError error_response) {

    Log.e("TAG", "onError: " + error_response);
}

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