I'm trying to do a post request with a WebView on Android.
After searching for days and trying dozens of things i couldn't get it work. In SWIFT it's just a few lines of code so i thought there must also be a simple way to do a post request for a webview on android.
As (for 2016) EncodingUtils and HTTPClient are deprecated this are my current approaches:
String url = "http://example.com/php.php";
String postData = null;
postData = "param1=" + URLEncoder.encode("1234567890", "UTF-8");
webcontent.postUrl(url,postData.getBytes());
//or
webcontent.postUrl(url, Base64.encode(postData.getBytes(), Base64.DEFAULT));
Both just result in a blank screen. There is just one parameter to be sent and a string containing html from the server should be received.
In addition, the php on the server returns a html-string with colored background irrespective of any input, but even this isn't displayed so maybe the whole request never reaches the server?
Thanks in advance!
In Android you do not use webView to access the content of the HTTP response. You'll need to use HttpClient for that purpose!
See this nice tutorial which explains the fundamentals! Also see this video if you find it hard!
Hope it helps!
Related
Here is my web service code
I can call it in my browser using http://sheltered-taiga-3258.herokuapp.com/toi/<input parameters> I am collecting Input parameters from user on android device. Obviously web service returns a JSON data which I need to display at client side in android application. I went through many posts and tutorials on android and web service but was not successful as many have the web service example of POST request and service in PHP. I want to do it for GET and service is in flask.
Please help Thank you.
EDIT:
I am calling web service using HttpGet object and I am passing my URL as parameter to it.
HttpGet httpget = new HttpGet(myURL);
and I am Constructing myURL as
EditText inputString = (EditText) findViewById(R.id.serverText);
String appendString =URLEncoder.encode(inputString.getText().toString(), "UTF-8") ;
private final HttpClient Client = new DefaultHttpClient();
String myURL = "http://sheltered-taiga-3258.herokuapp.com/toi/" + appendString;
Here I am getting myURL as
http://sheltered-taiga-3258.herokuapp.com/toi/hc+stays+toll+collection but I want it in this manner
http://sheltered-taiga-3258.herokuapp.com/toi/HC%20stays%20toll%20collection%20in%20kolhapur%20city
I know there is some url encoding problem but dont know way out of it.
Here is what gave me solution to my question may not be the suggestible and standard way of doing it but got me out of the problem:
String appendString = (inputString.getText().toString()).replace(" ", "%20") ;//here %20 is encoding for space
String myURL = "http://sheltered-taiga-3258.herokuapp.com/toi/" + appendString;
That gave me this :
http://sheltered-taiga-3258.herokuapp.com/toi/HC%20stays%20toll%20collection%20in%20kolhapur%20city
instead of this
http://sheltered-taiga-3258.herokuapp.com/toi/hc+stays+toll+collection
If I find the authentic way of doing this thing I will surely be posting it here marked as answer
i have posted a question for htmlunit in this link: how to use htmlunit with my android project
mainly i have a link, which i have get after login (i have login through web view) this link give me a simple page. in that page there is a textarea and a submit button. and there are some javascript too (i think these javascript run, when i press the submit button). i can do it through webview, but for some reason i don't want to use webview. whene i press submit button, it deliver the value of textarea and some value of hidden field with existing cookies(which are get when i logged in through webview) Post method. i need to do this without webview. now is there any other option beside htmlunit ?? i heard about HttpClient, HttpUrlConnection. but i don't know how to use them to solve my problem, because they are totaly new to me. i think if i use these class i have to run them in a seperate thread from UI tread. one more thing, after submitting it will redirect me to another page. i don't need to do anything with this redirected page.
thank you
this is the same answer which i have given here
i have solve the problem. first of all i was getting the right cookie all time. so what was the problem then. either i was wrong to integrate the cookie with Jsoup or Jsoup was doing something wrong. so, first i have get the page with HttpUrlConnection and then parse it with Jsoup. like this:
URL form = new URL(uri.toString());
HttpUrlConnection connection1 = (HttpURLConnection)form.openConnection();
connection1.setRequestProperty("Cookie", my_cookie);
connection1.setReadTimeout(10000);
StringBuilder whole = new StringBuilder();
BufferedReader in = new BufferedReader(
new InputStreamReader(new BufferedInputStream(connection1.getInputStream())));
String inputLine;
while ((inputLine = in.readLine()) != null)
whole.append(inputLine);
in.close();
Document doc = Jsoup.parse(whole.toString());
any advice about this code would be appreciated.
I am having a curious problem that perhaps someone has insight into. I encode a query string into a URL on Android using the following code:
request = REQUEST_BASE + "?action=loadauthor&author=" + URLEncoder.encode(author, "UTF-8");
I then add a few other parameters to the string and create a URI like this:
uri = new URI(request);
At a certain point, I pull out the query string to make a checksum:
uri.getRawQuery().getBytes();
Then I send it on its way with:
HttpGet get = new HttpGet(uri);
On the Appengine server, I then retrieve the string and try to match the checksum:
String query = req.getQueryString();
Normally, this works fine. However, there are a few characters that seem to get unencoded on the way to the server. For example,
action=loadauthor&author=Charles+Alexander+%28Ohiyesa%29+Eastman×tamp=1343261225838&user=1479845600
shows up in the server logs (and in the GAE app) as:
action=loadauthor&author=Charles+Alexander+(Ohiyesa)+Eastman×tamp=1343261226837&user=1479845600
This only happens to a few characters (like parentheses). Other characters remain encoded all the way through. Does anyone have a thought about what I might be doing wrong? Any feedback is appreciated.
I never did find a solution for this problem. I worked around it by unencoding certain characters on the client before sending things to the server:
request = request.replace("%28", "(");
request = request.replace("%29", ")");
request = request.replace("%27", "'");
If anyone has a better solution, I am sure that I (and others) would be interested!
URLEncoder does not encode parentheses and certain other characters, as they are supposed to be "safe" for most servers. See URLEncoder. You will have to replace these yourself if necessary.
Example:
URI uri = new URI(request.replace("(","%28"));
If a lot of replacements are needed, you can try request.replaceAll(String regularExpression, String replacement). This, of course, requires knowledge of regular expressions.
i've got a problem do a http post on android with german "umlaute" äöü. I am passing a json object to the method below and execute the returned ClientResource with post and the request entity in the returned client response. When I want to post something like { "foo":"bär" } the HttpClient sends something like { "foo":"b√§r" }.
Don't know why. What am I doing wrong.
public static ClientResource newPostRequest(Context context, String urn,
JSONObject form) throws MissingAccessTokenException {
ClientResource resource = new ClientResource(uri + urn);
StringRepresentation sr = new StringRepresentation(form.toString());
sr.setMediaType(MediaType.APPLICATION_JSON);
resource.getRequest().setEntity(sr);
return resource;
}
Update
I used the default android http client (which is a apache http client I believe) and got the same error. So the problem might be located here. I try to implement another json parser (currently gson) and (if possible) another http client. Be back later...
Update
Gson is not the problem. I added a json String to the StringRepresentation and nothing changed.
ANSWER
Well that's an odd one. Maybe someone can clear this for me. I always asked myself, why √§ where used and I figured out that translating the utf-8 ä leads to √§. Obviously my android phone did not use macroman, but my mac did. I therefor changed the text file encoding in eclipse, restarted eclipse and the tomcat server and it worked. Still the TCP/IP Monitor in eclipse uses mac roman which looks still wrong. It was thereby a problem with my server, not with the restlet client on android. I just couldn't see it because the TCP/IP Monitor encoded everything in macroman.
did you try calling setCharacterSet(...) on your StringRepresentation? e.g.,
StringRepresentation sr = new StringRepresentation(form.toString());
sr.setCharacterSet(CharacterSet.UTF_8);
I want to build an application which takes user/pass information from user and use it on an https webpage and extract the returned raw html code from that page.
I want to know is this possible?
If so, what sort of class i should use. Can it be done with some hidden webview mechanism. Sine i think we can access the java script variable in a webview from our application. So is this possible. Or i am just wasting my time in this direction.
If you are asking if it is possible to 'download' a webpage without actually displaying it in a WebView then try this...
HttpClient client=new DefaultHttpClient();
HttpGet getMethod = new HttpGet(Url);
ResponseHandler<String> responseHandler=new BasicResponseHandler();
String response = client.execute(getMethod, responseHandler);
EDIT: Sorry - the Url parameter passed to HttpGet() above is actually a String variable containing a url to the wep page you want.
Pretty old subject here, but I see that I'm not the only one facing this situation.
This is how I understand it:
HttpClient objects and WebView objects will not share the same "session" scope through your application.
That is, if you have this URL that performs authentication and starts a valid session on a website; and following that, you try to open one of those website pages - session protected - through the webview, the webview will act as if no session were available. WebView is not aware of the HttpClient session.
A solution to that is to call the URL that starts a session through the WebView.postUrl method like this:
webView.postUrl(url, EncodingUtils.getBytes(postParameters, "BASE64"));
I'm sure this can be done in a hidden webView.