Sending POST request in android studio

Question

I followed this article to build my own RESTful API server before. Now, I would like to send a POST request to my API server in android studio. I followed this reply, but it is not successful.

Here is part of my code:

@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); URL url; HttpURLConnection connection = null; try { url = new URL("http://myip/task_manager/v1/register"); connection = (HttpURLConnection)url.openConnection(); connection.setDoOutput(true); connection.setRequestMethod("POST"); // hear you are telling that it is a POST request, which can be changed into "PUT", "GET", "DELETE" etc. connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); // here you are setting the `Content-Type` for the data you are sending which is `application/json` connection.connect(); //Send request DataOutputStream wr = new DataOutputStream( connection.getOutputStream ()); wr.writeBytes("Parameter String"); // I dunno how to write this string.. wr.flush(); wr.close (); InputStream is; int response = connection.getResponseCode(); if (response >= 200 && response <=399){ //return is = connection.getInputStream(); //return true; } else { //return is = connection.getErrorStream(); //return false; } } catch (Exception e) { e.printStackTrace(); //return false; } finally { if(connection != null) { connection.disconnect(); } } }

Here is my questions:
1. When "connection.connect();" is run, there is error in console. Is my url string is wrong?
2. What should the "Parameter String" be like? (my parameters are email=xxx, name=yyy)
3. Is there any better method to send a POST request?

Thanks a lot!!!!!!~

We should not connect network call in the main thread. Ref this official link. — Muthukrishnan Rajendran
– Muthukrishnan Rajendran, Commented Mar 12, 2018 at 11:28

Marcos Placona · Accepted Answer · 2018-03-12 14:33:32Z

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", "[email protected]") .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!

How to execute the request? I googled for it and the answer is "Response response = client.newCall(request).execute();", but i dunno where to declare the variable client. Thx~
Updated the code with exactly what you should need. Have a look at some of the recipes in the docs for more information: github.com/square/okhttp/wiki/Recipes

Nibin Salim · Accepted Answer · 2018-03-12 11:30:48Z

Please use volley or retrofit dependency for api calls in android as it is easy to use

Volley Tutorial: https://www.androidtutorialpoint.com/networking/android-volley-tutorial/

Retrofit Tutorial: https://www.androidhive.info/2016/05/android-working-with-retrofit-http-library/

Please refer these two

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