Develop Reference

Get Request HttpUrlConnection - Incorrect response

I am working on an Android App, App is using GET Request to connect with server.
The code I have written to connect with server is working perfectly on many devices.
But its not giving good response on LENOVO YOGA TAB3, It returns Html tags instead of JSON text, Firstly I was confused that there may be some issue in the API URL but I checked URL using browser, Its returning good response so I am sure URL is correct.
Here are API URL and its response :
API URL
[http://www.xyz.in/xyzapi/?building=on&address=Assotech Sandal Suites, Sector 135, Noida, Uttar Pradesh 201304, India&bill_amount=12500&type=R&fullstatename=Uttar Pradesh&lat=28.496171099999998&lng=77.4027049&state=UP&country=IN&district=Gautam Buddha Nagar&sublocality=Sector 135&calc-sess=59d4beba305f3&netmetering=1][1]
Response on Many Android Phones:
{"lifetimesaving":"25.0 Lacs","proposed_pv_capacity":10,"billWithSolar":3872,"bill_amount":"12500","sanction":10,"project_cost":"6.0 Lacs","return_oninevstment":"20.8","roi_image":"solar_score6_6.png","treeadded":"346 ","treeofftheroad":"9 "}
Response on Lenovo Yoga Tab3:
<head/><style>.personal-details h2{font-size:34px}.netmetering-tgle{position:absolute;left:0;right:0;bottom:5px;width:211px}.netmetering-tgle .wnm{float:left;position:relative;padding:0 10px 0 0;min-width:130px;text-align:center}.netmetering-tgle .wnm a{color:#c97511;background:none}#radioBtn .btn{border:1px solid transparent;border-radius:0!important;font-family:"Din-Bold"}#radioBtn .notActive{color:#c97511;background-color:#e0e1e2;padding:2px 0;width:38px;background-size:100% 100%;border-color:transparent;font-family:"Din-Bold";border-radius:5px}#radioBtn .active{color:#fff;background-color:#addc6f;border-color:transparent;padding:2px 5px;width:38px;cursor:auto;pointer-events:none;border-radius:5px;box-shadow:inset 0 0 10px rgba(0,0,0,.8)}#radioBtn .notActive[data-
So response is incorrect on Yoga Tab3.
Here is the code I am using to connect with Server :
public static String connectToServerUsingGETMethod(String API_COMPLETE_URL){
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(API_COMPLETE_URL);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader isr = new InputStreamReader(in);
String line = "";
BufferedReader reader = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line);
}
//get the string version of the response data
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
}
return "";
}
Suggest me If I can add something in this code so that it can work on Yoga Tab 3 too.

I think you should set static content type when making request to make sure the response sent back is JSON. Similarly, it looks like below:
HttpURLConnection urlConnection = null;
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
Hope it works for you.

How can I share database android application and a .net web application?

I want to share database between an android application and a web application build using Asp.net (my database is based on an IIS server.)
I just want to find the possible ways available to do it, and if I could use php services with IIS server.
I would be so thankful if someone could help me.

Million ways. I can advise you this one: create REST or SOAP service which will have access to database with all methods you need. Now in android application and in ASP.NET application you can "ask" your service to create/update/delete/do something.

try with below code.Hope it will resolved your query.
/**
* This method is used for getting user response after sending request to server.
* It returns the response after executing url request.
* #param params
* #return
*/
public String getJSONObject(String params)
{
try
{
URL url = null;
String response = null;
String parameters = "param1=value1&param2=value2";
//url = new URL("http://www.somedomain.com/sendGetData.php");
url = new URL(params);
//create the connection
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setReadTimeout(40000);
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
//set the request method to GET
connection.setRequestMethod("GET");
//get the output stream from the connection you created
OutputStreamWriter request = new OutputStreamWriter(connection.getOutputStream());
//write your data to the ouputstream
request.write(parameters);
request.flush();
request.close();
String line = "";
//create your inputsream
InputStreamReader isr = new InputStreamReader(
connection.getInputStream());
//read in the data from input stream, this can be done a variety of ways
BufferedReader reader = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
//get the string version of the response data
response = sb.toString();
//do what you want with the data now
//always remember to close your input and output streams
isr.close();
reader.close();
}
catch (Exception e)
{
Log.e("HTTP GET:", e.toString());
response="";
}
return response;
}

Maximum HttpUrlConnection Response

I am using HttpUrlConnection to get JSON strings from web, but the response is good for smaller strings but not for larger ones: this is what I am seeing in my app, and this is the data from server to a web page I did not include any HTML from server side.
Here is my code:
URL adr = new URL("http://placeform.tk/forapp.php");
HttpURLConnection connection =(HttpURLConnection) adr.openConnection();
connection.connect();
int rcode = connection.getResponseCode();
Log.d("rcode",Integer.toString(rcode));
if (rcode == HttpURLConnection.HTTP_OK) {
InputStream inputStreamReader = connection.getInputStream();
String c = connection.getHeaderField("content-length");
Reader rd = new InputStreamReader(inputStreamReader);
Log.d("contentsize", Integer.toString(connection.getContentLength()) + c);
chars = new char[connection.getContentLength()];
Log.d("contentsize", Integer.toString((int)connection.getContentLength()) + c);
rd.read(chars);
String output = new String(chars);

use this link and add that class in your project and call webservice from that class. cause that class will build up your response string with use of string builder. have a look at that class. and comment if you have any problem.

Android: extracting website using BufferedReader: Information extracted are outdated

I am reading html source code of a public website using the following code:
Code:
#Override
protected Void doInBackground(Void... params)
{
try
{
URL url = new URL(""+URL);
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String inputLine;
PageCode = "";
OriginalPageCode = "";
while ((inputLine = in.readLine()) != null)
{
PageCode += inputLine;
}
OriginalPageCode = PageCode;
try
{
extract_website_and_save(); // extracting data from PageCode
}
catch (Exception e1)
{
}
in.close();
}
Background:
The above code sometimes can fetch the most updated website properly. But occasionally it linked to an outdated version of the website and hence unable to obtain the most updated information for the website.
I am curious why the above will occur, does it related to extracting from cache instead of the real updated website??
I therefore used Chrome to browse the same link, and discovered that Chrome also fetched the outdated website.
I have tried restarting the device, but the problem continues.
After 30 minutes to an hour, I requested the app to fetch again and it then can extract the most updated information. I at the same time browse the website using Chrome, Chrome can now obtain the most updated website.
Question:
The above BufferedReader should have no relationship with Chrome? But they follow the same logic and hence extracting from cache instead of from the most updated website?

I strongly suspect the end point is being cached by URL
Try something like this
urlSrt = urlSrt + "?x=" + new Random().nextInt(100000);
// If your URL already is passing parameters i.e. example.com?x=1&p=pass - then modify
// the urlSrt line to to use an "&" and not "?"
// i.e. urlSrt = urlSrt + "&x=" + new Random().nextInt(100000);
URL url = new URL(urlSrt);
URLConnection con = url.openConnection();
con.setUseCaches(false); //This will stop caching!
So if you modify your code to something like this.
URLConnection con = url.openConnection();
con.setUseCaches(false);
BufferedReader in = new BufferedReader(new InputStreamReader(
con.getInputStream()));

Making large REST requests

I have a REST service I can't alter, with methods for uploading an image, encoded as a Base64 string.
The problem is that the images can go up to sizes of 5-10MB, perhaps more. When I try to construct a Base64 representation of an image of this size on the device, I get an OutOfMemory exception.
I can however encode chunks of bytes at a time (3000 let's say), but this is useless as I would need the whole string to create a HttpGet/HttpPost object:
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet("www.server.com/longString");
HttpResponse response = client.execute(httpGet);
Is there a way of going around this?
Edit: trying to use Heiko Rupp's suggestions + the android doc, I get an exception ("java.io.FileNotFoundException: http://www.google.com") at the following line: InputStream in = urlConnection.getInputStream();
try {
URL url = new URL("http://www.google.com");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoOutput(true);
urlConnection.setChunkedStreamingMode(0);
OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());
out.write("/translate".getBytes());
InputStream in = urlConnection.getInputStream();
BufferedReader r = new BufferedReader(new InputStreamReader(in));
StringBuilder total = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
total.append(line);
}
System.out.println("response:" + total);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Am I missing something? The GET request that I need to execute looks like this:
"http://myRESTService.com/myMethod?params=LOOONG-String", so the idea was to connect to http://myRESTService.com/myMethod and then output a few characters of the long string at a time. Is this correct?

You should try to use the URLConnection instead of the apache http client, as this does not require you to hold the object to send in memory, but instead you can do something like:
pseudocode!
HttpUrlConnection con = restUrl.getConnection();
while (!done) {
byte[] part = base64encode(partOfImage);
con.write (part);
partOfImage = nextPartOfImage();
}
con.flush();
con.close();
Also in Android after 2.2 Google recommends the URLConnection over the http client. See the description of DefaultHttpClient.
The other thing you may want to look into is the amount of data to be sent. 10 MB + base64 will take quite a while to transfer (even with gzip compression, which the URLConnection transparently enables if the server side accepts it) over a mobile network.

You must read docs for this REST service, no such service will require you to send such long data in GET. Images are always sent as POST. POST data is always at the end of request and allows to be added iteratively.