Android making HTTP Requests
In most of the android applications it is essential that app may need to connect to internet and make some HTTP requests. In this tutorial i’ll be demonstrating about making simple HTTP Requests/Calls in Android.
There are several steps in HTTP Requests. So read all steps one by one :
1. HTTP POST
- Creating HTTP Client
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// Creating HTTP client HttpClient httpClient = new DefaultHttpClient(); |
- Creating HTTP Post : HTTP Post is used if we have to post some data to server.
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// Creating HTTP Post HttpPost httpPost = new HttpPost("your url"); |
- Building Post Parameters
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// Building post parameters, key and value pair List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(3); nameValuePair.add(new BasicNameValuePair("password", "your_password")); nameValuePair.add(new BasicNameValuePair("phone", "9887711222")); |
- URL Encoding POST data : Before making HTTP request you need to encode the post data in order to convert all string data into valid url format.
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// Url Encoding the POST parameters try { httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair)); } catch (UnsupportedEncodingException e) { // writing error to Log e.printStackTrace(); } |
- Making HTTP Request via Http Response : Now you need to execute httpPost using the httpClient created before.
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// Making HTTP Request try { HttpResponse response = httpClient.execute(httpPost); // writing response to log Log.d("Http Response:", response.toString()); } catch (ClientProtocolException e) { // writing exception to log e.printStackTrace(); } catch (IOException e) { // writing exception to log e.printStackTrace(); } |
2. HTTP GET
- Creating HTTP Client
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/ Creating HTTP client HttpClient httpClient = new DefaultHttpClient(); |
- Creating HTTP Get : Http Get is used to fetch data from server.
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//Creating Http Get HttpGet request = new HttpGet("your url"); |
- Making HTTP Request via Http Response : Now you need to execute httpPost using the httpClient created before.
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// Making HTTP Request try { HttpResponse response = httpClient.execute(httpPost); // writing response to log Log.d("Http Response:", response.toString()); } catch (ClientProtocolException e) { // writing exception to log e.printStackTrace(); } catch (IOException e) { // writing exception to log e.printStackTrace(); } |
- Making HTTP Entity : An entity that can be sent or received with an HTTP message.
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//Creating Http Entity HttpEntity entity = response.getEntity(); |
- Finally getting EntityUtils : This string variable contains Json data that can be parsed.
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//Getting entity data in string String data = EntityUtils.toString(entity); |
Finally, you are ready to work on HTTP Requests.
Thanks. 