Develop Reference

Can I use HttpClient to do a PUT or Delete

Currently I am connecting from android to a .net WEB API using HttpClient and I have been able to do a GET and POST to read/write data. However I want to do an Update and a Delete.
I tried to do this using a POST, but it simple creates more records. Here is my code for the POST, how would I change it to do a PUT or DELETE instead?
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://mywebsite.net/api/employees/6");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(5);
nameValuePairs.add(new BasicNameValuePair("firstName", "UpdatedHello"));
nameValuePairs.add(new BasicNameValuePair("lastName", "World"));
nameValuePairs.add(new BasicNameValuePair("employee_name", "UpdatedHello World"));
nameValuePairs.add(new BasicNameValuePair("password", "xxx"));
nameValuePairs.add(new BasicNameValuePair("isActive", "1"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);

yeah! the document of httpClient http://hc.apache.org/httpclient-3.x/methods.html

You have PutMethod and DeleteMethod API for performing PUT and DELETE Http requests. The sample usage as follows as per doc
PUT Request - The put method is very simple, it takes a URL to put to and requires that the body of the request method be set to the data to upload. The body can be set with an input stream or a string.This method is generally disabled on publicly available servers because it is generally undesireable to allow clients to put new files on the server or to replace existing files.
PutMethod put = new PutMethod("http://jakarta.apache.org");
put.setRequestBody(new FileInputStream("UploadMe.gif"));
// execute the method and handle any error responses.
...
// Handle the response. Note that a successful response may not be
// 200, but may also be 201 Created, 204 No Content or any of the other
// 2xx range responses.
DELETE Request - The delete method is used by supplying a URL to delete the resource at and reading the response from the server.This method is also generally disabled on publicly available servers because it is generally undesireable to allow clients to delete files on the server.
DeleteMethod delete = new DeleteMethod("http://jakarata.apache.org");
// execute the method and handle any error responses.
...
// Ensure that if there is a response body it is read, then release the
// connection.
...
delete.releaseConnection();

HttpPost in android not working

I am trying to connect to apache tomcat server using HTTP POST, when i see LOG file of server it showing GET /login/validate_doc.jsp HTTP/1.1" 200 685 ,
which means it is getting a GET request when i am sending using HttpPost and form parameters are not received by server.
my code is below:
HttpPost post_http=null;
post_http=new HttpPost("http://somexx.ac.in/medONmob/validate_doc.jsp");
try
{
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("username",username));
nameValuePairs.add(new BasicNameValuePair("password",password));
post_http.setEntity(new UrlEncodedFormEntity(nameValuePairs));
Where am i wrong ...??? Help me out please

Try specifying encoding when constructing UrlEncodedFormEntity. By default it is ISO-8859-1.
Also this will make your code future safe
Creating a UrlEncodedFormEntity from a List of NameValuePairs throws a NullPointerException

Given that you are using a post, then you probably are sending data on your request body, Am I right?, then you have to specify the content-type of the data you are sending in the headers, in order to execute a proper post:). For example if I am sending a json in the request body then I should add a header like this:
request.addHeader("content-type", "text/json");
Cheers

Android Login to Website - POST Request Crashing App

I have a site that I would like to log into. Once there, I would parse the code to display member data (like any other login app). I have sort of pulled this code from somewhere and I'd like to know why it's crashing. Basically, I have two login inputs, username and password. I'll take them from the user but as of now I'm just inputting random credentials for testing. At the end, I want to get it to the login page (same url once logged in) and display the HTML, for now.
Here's my code so far:
HttpClient httpClient = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(httpClient.getParams(), TIMEOUT_MS);
HttpConnectionParams.setSoTimeout(httpClient.getParams(), TIMEOUT_MS);
HttpPost httpPost = new HttpPost("login url"); // Removed for StackOverflow question
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("sid", "name"));
nameValuePairs.add(new BasicNameValuePair("pin", "pass"));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpClient.execute(httpPost);
BufferedReader br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()), 8096);
tvStatus.setText((CharSequence) br);

Are you running the POST request on the UI thread? This causes the UI to freeze and after a certain time period, the OS considers the app to be non-responsive and force closes it. Web Requests should always be an Async task

I guess this post on my blog will help you to understand, how to use AsyncTask, for downloading stuff.
Though if you tell us what is the Exception which is getting thrown up, I could've helped you more on this. To see the Exception, open the LogCat,identify the error text which will be in red, copy the whole red text and paste it into your question.

Android HttpPost with Gzip and NameValuePair

Is it possible to set 2 entities for a HttpPost? Like:
HttpPost post = new HttpPost("http://www.abc.com");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("A",
a));
nameValuePairs.add(new BasicNameValuePair("B", b));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
post.setHeader("Accept-Encoding", "gzip");
ByteArrayEntity bae = new ByteArrayEntity(compress(json));
post.setEntity(bae);
HttpResponse resp;
resp = client.execute(post);
I'm trying to achieve telling the server that there are some parameters and a zip file.

yes You can send zip file and pass parameter using nameValuePairs. go to below link you may get your solution.
http://vikaskanani.wordpress.com/2011/01/11/android-upload-image-or-file-using-http-post-multi-part/
Android upload multi files to server via http post
in this link place your zip file address on place of image. and you may have to do some more modification.

Not like this. You need use a multi-part entity, you can manually encode it if it is relatively simple, or use org.apache.http.entity.mime.MultipartEntity (which is not part of the Android SDK). There are multiple post about it on SO, search for 'android multipart'.

Info from the URL

I want to create an Application, the description of it as follows
Perform search
Display the results.
Basically, I want to create an application for an existing web-site which does this, but my need is to create for a Mobile.
Based on the website link, it refers to some ASP pages. for e.g. http://test.com/query.asp. The website allows the user to enter various input for search.
I want to create and then send the same request to the server and get the result. How can I know what all parameters/headers it is taking and what format is the response (XML or JSON).
Below is my sample code for the Android Device
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
List nameValuePairs = new ArrayList(3);
//this is where you add your data to the post method
nameValuePairs.add(new BasicNameValuePair("sel", "1"));
nameValuePairs.add(new BasicNameValuePair("txt", "2466"));
nameValuePairs.add(new BasicNameValuePair("selr", "2011"));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httpPost);
content = response.getEntity().getContent();
return content;
// Update
Ok, now I am able to get the desired output from the web query.
I printed the result for my Http Post request and I saw some HTML tags in it. In short, it prints the source of the HTML page that has to be displayed.
Is there a way to display the HTML view in my Android Application? Or a way to fetch only the relavant data from the response and ignore the HTML tags etc..?
First line of the response looks like
06-17 16:35:21.756: DEBUG/(30307): <script language="javascript" type=text/css>
//
Regards,
Nirav

You need to speak with the owner/developer of the web site / service that you want to access. Only they can reliably tell you what their APIs are if you are unable to determine them yourself from WireShark captures.