It is often a requirement that you need to connect to a server through HTTP from your android application. When you use servlets/html, making such requests are a no-brainer. But, in Android it needs some searching before implementing such functions.

Here’s some sample code snippets that explains how you can make GET and POST requests from your android application.

Enable Internet permission for your android application:

Before making any use of internet in your android application, you should enable the internet permission for your application. To do this, open the *AndroidManifest.xml *file and then add the below line:

HTTP GET request in Android application:

public static String getHttpResponse(URI uri) {
	Log.d(APP_TAG, "Going to make a get request");
	StringBuilder response = new StringBuilder();
	try {
		HttpGet get = new HttpGet();
		get.setURI(uri);
		DefaultHttpClient httpClient = new DefaultHttpClient();
		HttpResponse httpResponse = httpClient.execute(get);
		if (httpResponse.getStatusLine().getStatusCode() == 200) {
			Log.d("demo", "HTTP Get succeeded");

			HttpEntity messageEntity = httpResponse.getEntity();
			InputStream is = messageEntity.getContent();
			BufferedReader br = new BufferedReader(new InputStreamReader(is));
			String line;
			while ((line = br.readLine()) != null) {
				response.append(line);
			}
		}
	} catch (Exception e) {
		Log.e("demo", e.getMessage());
	}
	Log.d("demo", "Done with HTTP getting");
	return response.toString();
}

HTTP POST request in Android application:

A POST request is slightly (well, vastly) different from a GET request (I have seen most developers use there requests interchangeably!). In a POST, we often send some parameters to change state of the objects in server.

In Android too, we have some mechanisms to send HTTP parameters while sending a POST request, which is shown in below code snippet.

public static String postHttpResponse(URI uri) {
	Log.d(APP_TAG, "Going to make a post request");
	StringBuilder response = new StringBuilder();
	try {
		HttpPost post = new HttpPost();
		post.setURI(uri);
		List params = new ArrayList();
		params.add(new BasicNameValuePair("paramName", "paramValue"));
		post.setEntity(new UrlEncodedFormEntity(params));
		DefaultHttpClient httpClient = new DefaultHttpClient();
		HttpResponse httpResponse = httpClient.execute(post);
		if (httpResponse.getStatusLine().getStatusCode() == 200) {
			Log.d(APP_TAG, "HTTP POST succeeded");
			HttpEntity messageEntity = httpResponse.getEntity();
			InputStream is = messageEntity.getContent();
			BufferedReader br = new BufferedReader(new InputStreamReader(is));
			String line;
			while ((line = br.readLine()) != null) {
				response.append(line);
			}
		} else {
			Log.e(APP_TAG, "HTTP POST status code is not 200");
		}
	} catch (Exception e) {
		Log.e(APP_TAG, e.getMessage());
	}
	Log.d(APP_TAG, "Done with HTTP posting");
	return response.toString();
}