so this is for a project im doing for my school in which we need a backend.
our current setup is that the foreground is an android app, whereas the backend is a mySQL database that is located within my school's servers. The android app is supposed to interact with the mySQL database using a php script.
my php script is set currently hardcoded to return one single row from the mySQL database in JSON format.
my android code is as follows:
public static final String KEY = "URL of my PHP script";
InputStream is = null;
String result = "";
try{
HttpClient httpclient = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI(KEY));
Log.d(null,"there");
HttpResponse response = httpclient.execute(request);
Log.d(null, "here");
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection "+e.toString());
}
However, I get an exception at the line
HttpResponse response = httpclient.execute(request);
in which the error says: No Peer Certificate.
Anyone know what's wrong with it, and how to fix it?
I have the same issue. This link worked for part of my needs.
http://www.knowledgebit.appspot.com/zahangirbd/TopicView.action;jsessionid=E2BZt_6bp4uFFbMyq42gWg?id=56001
however, there is still an issue with some links(i believe im not providing the proper certificate)
EDIT: so it turns out that the order of the certificates were the problem.
check this out, this helped me..
Apache HttpClient on Android producing CertPathValidatorException (IssuerName != SubjectName)
Related
I've been struggling a bit on sending JSON objects from an application on android to a php file (hosted locally). The php bit is irrelevant to my issue as wireshark isn't recording any activity from my application (emulation in eclipse/ADK) and it's almost certainly to do with my method of sending:
try {
JSONObject json = new JSONObject();
json.put("id", "5");
json.put("time", "3:00");
json.put("date", "03.04.12");
HttpParams httpParams = new BasicHttpParams();
HttpClient client = new DefaultHttpClient(httpParams);
//
//String url = "http://10.0.2.2:8080/sample1/webservice2.php?" +
// "json={\"UserName\":1,\"FullName\":2}";
String url = "http://localhost/datarecieve.php";
HttpPost request = new HttpPost(url);
request.setEntity(new ByteArrayEntity(json.toString().getBytes(
"UTF8")));
request.setHeader("json", json.toString());
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
if (entity != null) {
InputStream instream = entity.getContent();
}
} catch (Throwable t) {
Toast.makeText(this, "Request failed: " + t.toString(),
Toast.LENGTH_LONG).show();
}
I've modified this from an example I found, so I'm sure I've taken some perfectly good code and mangled it. I understand the requirement for multi-threading so my application doesn't hang and die, but am unsure about the implementation of it. Would using Asynctask fix this issue, or have I missed something else important?
Thankyou for any help you can provide.
Assuming that you are using emulator to test the code, localhost refers to the emulated environment. If you need to access the php hosted on your computer, you need to use the IP 10.0.2.2 or the LAN IP such as 192.168.1.3. Check Referring to localhost from the emulated environment
You can refer to Keeping Your App Responsive to learn about running your long running operations in an AsyncTask
you should use asynctask or thread, because in higher versions of android it doesn't allow long running task like network operations from ui thread.
here is the link for more description
Okay, so I was trying to send Http Post Requests to this one site, and I sniffed the sent request with wireshark thus getting the text data from the post request of this site. I used this in a stock Java application, and it worked perfectly fine. I could use the post method regularly with no problem whatsoever, and it would return the appropriate website. Then I tried doing this with Android. Instead of returning the actual html data after executing the post request, it returns the regular page html data untouched. It DOES send a post request (sniff with wireshark again), it just doesn't seem to get the appropriate response. I took the exact same method used from another one of my projects, which worked perfectly fine in that project, and pasted it into my new project. I added the INTERNET user permission in Android, so there's nothing wrong with that. The only visible difference is that I used NameValuePairs in the other one (the one that worked) and in this one I'm directly putting the string into a StringEntity without encoding (using UTF-8 encoding screws up the String though). I used this exact same line of text in regular Java like I said, and it worked fine with no encoding. So what could be the problem? This is the code:
public static String sendNamePostRequest(String urlString) {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(urlString);
StringBuffer sb = new StringBuffer();
try {
post.setEntity(new StringEntity(
"__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=%2FwEPDwULLTE3NDM5MzMwMzRkZA%3D%3D&__EVENTVALIDATION=%2FwEWBAL%2B%2B4CfBgK52%2BLYCQK1gpH7BAL0w%2FPHAQ%3D%3D&_nameTextBox=John&_zoekButton=Zoek&numberOfLettersField=3"));
HttpResponse response = client.execute(post);
HttpEntity entity = response.getEntity();
BufferedReader br = new BufferedReader(new InputStreamReader(
entity.getContent()));
String in = "";
while ((in = br.readLine()) != null) {
sb.append(in + "\n");
}
br.close();
} catch (Exception e) {
e.printStackTrace();
}
return sb.toString();
}
Can you see what's wrong here?
I'm trying to send some json data from Android to a clojure/compojure server
However I can't seem to able to properly send or receive the data, and I'm not quite sure if the problem lies with Android or compojure.
Here is the java code
String PATH = "http://localhost:8080/get_position";
DefaultHttpClient mClient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(PATH);
HttpResponse response;
httpget.getParams().setParameter("measurements", measurements.toString());
response = mClient.execute(httpget);
HttpEntity entity = response.getEntity();
Where mesurements is the JSON object.
And the main compojure code for handling the routing
(defroutes main-routes
(POST "/get_position" {params :params}
(emit-json (find-location (:results (read-json (:measurements params))))))
(route/not-found "Page not found"))
The request is properly received, but I get an error that params is nil
java.lang.IllegalArgumentException: No implementation of method: :read-json-from of protocol: #'clojure.data.json/Read-JSON-From found for class: nil
Does anyone see a problem with this code or knows the correct way to do this?
The params map has strings as keys, I believe, not keywords.
I recommend using ring-json-params.
I am new to android networking and would like to find the best solution/source that would help me learn the same. I have a working android application but i want to include network services that can get and send data to the webserver. While i was searching for the same i found link ( http://www.helloandroid.com/tutorials/connecting-mysql-database ) which dont produce any results. I also found that SOAP or REST (with android) are probably recommended methods, if so please give complete tutorials to learn the same ( i have no prior knowledge on webservices). In my application I would be required to send data to the server and receive data from the servers sql
Thank you
This is for post data on server,
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
httppost.addHeader("Content-Type", "application/x-www-form-urlencoded");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs,HTTP.UTF_8));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
// get response entity
HttpEntity entity = response.getEntity();
// convert entity response to string
if (entity != null)
{
InputStream is = entity.getContent();
// convert stream to string
result = convertStreamToString(is);
result = result.replace("\n", "");
}
or see how to post data to remote server in android app [closed], Post the data to Server
I'm developing an Android app that gets a JSON_encoded result from a php middleware script that connects to a MySQL database. I have given the application Internet permissions.
The problem I'm having is that the program gives an UnknownHostException error the first time it is run. I have the program on a timer, and subsequent calls to the timer handler function do not return the UnknownHostException error. Do you have any idea why this would occur? I have tested the domain and made sure that it connects correctly through a web browser.
Here's a snippet from the code:
public final void timerAlert(){
final Handler handler = new Handler();
final Runnable r = new Runnable()
{
public void run() {
Timer_Method();
handler.postDelayed(this,1000);
}
};
handler.postDelayed(r, 1000);
}
public void Timer_Method()
{
//See if this buzzer is being signaled.
String result = null;
InputStream is = null;
StringBuilder sb=null;
//http post
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("BuzzerID",BuzzerID.toString()));
Toast.makeText(getBaseContext(), "BuzzerID="+BuzzerID.toString() ,Toast.LENGTH_LONG).show();
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://domain/getBuzzStatus.php?BuzzerID="+BuzzerID.toString());
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection"+e.toString());
Toast.makeText(getBaseContext(), "Hm, problem here="+e.toString() ,Toast.LENGTH_LONG).show();
}
Note that domain has something else there in the actual code and that this is just a snippet but is where the first issue occurs. Also note that I am mixing get and post, something I'd rather not do, but for some reason passing the nameValuePair to the php script doesn't send anything to $_REQUEST.
A snippet from the very simple PHP script:
$sql_string="SELECT Signal FROM BuzzCustomer WHERE idBuzzCustomer=" . $_GET['BuzzerID'];
$sql = mysql_query($sql_string);
while($row=mysql_fetch_assoc($sql))
$output[]=$row;
print(json_encode($output));
mysql_close();
I switched to $_GET here because I could not get $_REQUEST to work. Any help would be appreciated. Thanks in advance!
May be their will be no Internet connection in the simulator......Check a url in browser
Instead of
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
Use
ResponseHandler<String> response = new BasicResponseHandler();
String result = httpclient.execute(httppost,response);
Also put Internet permission in the Manifest
Just a guess, but maybe the DNS request takes too long and your HttpClient gives up, but the request is finished and cached so the next time it does not fail?
This With Apache HttpClient, why isn't my connection timeout working? seems to be a question about how to set the timeout for HttpClient.