I have developed an android app using Web API. I'm deleting a row using HttpDelete through .NET Web API. App working perfect on debug mode. But as I published the signed release mode apk, the app gets crash on delete Web API.
Please provide me the solution for it.
Attaching code of android for delete
private class DeleteData extends AsyncTask<Integer, Void, Void> {
#Override
protected Void doInBackground(Integer... params) {
int id = params[0];
Log.d("got id",""+id);
try {
URL url = new URL("My URL");
Log.d("URL",""+url);
HttpURLConnection httpURLConnection=(HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("DELETE");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
httpURLConnection.connect();
InputStream is = httpURLConnection.getInputStream();
int byteCharacter;
String result="";
while ((byteCharacter = is.read()) != -1)
{
result += (char)byteCharacter;
}
Log.d("json api",result);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
enter image description here
I'm using Asynctask to pass the parameters of API. The Asynctask executing but the String Response in Asynctask PostExecute giving me a null for a device with SDK 23 and below. But when the device is equal or higher to SDK24(Nougat), it works perfectly and the data are being sent to the API however when the SDK is 23 and lower data are not being sent to API. Does anyone encounter this problem? Please enlighten me what I miss in my code or I do wrong code. Massive thank you.
private class sendToServerOfficial extends AsyncTask<String,Void,String> {
int statusCodeone;
String convert_txt_et_username = et_username.getText().toString();
String convert_txt_content = et_content.getText().toString();
#Override
protected String doInBackground(String... strings) {
try {
urlURL = new URL("http://www.testingsite.com/api/sendServer?/ip="+getIPAddress+"&phone_num="+getMobilePhoneNumber+"&user_text="+convert_txt_et_username+"&content_text="+convert_txt_content);
HttpURLConnection httpURLConnection = (HttpURLConnection) urlURL.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Content-Type","UTF-8");
httpURLConnection.connect();
statusCodeone = httpURLConnection.getResponseCode();
if (statusCodeone == 200) {
InputStream it = new BufferedInputStream(httpURLConnection.getInputStream());
InputStreamReader read = new InputStreamReader(it);
BufferedReader buff = new BufferedReader(read);
StringBuilder dta = new StringBuilder();
String chunks;
while ((chunks = buff.readLine()) != null) {
dta.append(chunks);
}
buff.close();
read.close();
return dta.toString();
}
}
catch (ProtocolException e) { e.printStackTrace(); }
catch (MalformedURLException e) { e.printStackTrace(); }
catch (IOException e) { e.printStackTrace(); }
return null;
}
#Override
protected void onPostExecute(String response) {
Toast.makeText(MainActivity.this, response + "Form is submitted already" + urlURL, Toast.LENGTH_LONG).show();
txt_inputURL.setEnabled(true);
btnClick.setClickable(true);
txt_inputURL.getText().clear();
}
}
I can't figure out how to make this code work in an AsyncTask, I searched for multiple examples but it keeps crashing. I found this simple code on the internet and I want to adapt it to get the URL from a textfield and get the HTML code. I found out it has to be in an AsyncTask otherwise it won't work but even in an AsyncTask I can't get it to work. Here's my code:
String ETURL = ETURLInput.getText().toString();
try {
URL TestURL = new URL(ETURL);
BufferedReader bufferReader = new BufferedReader(
new InputStreamReader(TestURL.openStream()));
String outputCode;
while ((outputCode = bufferReader.readLine()) != null)
TVCode.setText(outputCode);
bufferReader.close();
} catch (Exception e) {
TVCode.setText("Oops, something went wrong.")
}
}
This is the code which needs to be executed inside an ActionListener. So when I click the button it should execute this code in an AsyncTask.
Hopefully somebody could help me with this.
You forgot to add openConnection, add this: URLConnection conn = TestURL.openConnection(); after creating your URL object.
To make it work with an asynctask, what you can do is storing your string in a class variable, returning it in the doInBackGround and using it in your onPostExecute.
An example of method you can create in your asynctask:
protected String getContentUrl(String URL) {
String line=null;
String result="";
try {
try {
URL url;
// get URL content
url = new URL(URL);
URLConnection conn = url.openConnection();
// open the stream and put it into BufferedReader
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
line=br.readLine();
while (line!= null) {
result=result+line;
line=br.readLine();
}
//System.out.print(result);
br.close();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
Then you get your result this way on doInBackGround:
getContentUrl(YOUR URL HERE)
Store this value in a String, and return it. Then you can use it in your onPostExecute
Hope it helps :)
I'm trying to call to my API sending a JSON to delete a product from my DB; however, it doesn't delete anything.
The response of the JSON is "true," and it doesn't give to me any error; even so, when I make a query on my DB, the product is still there.
I've created a class called HttpDeleteWithBody that looks like:
class HttpDeleteWithBody extends HttpEntityEnclosingRequestBase {
public static final String METHOD_NAME = "DELETE";
public String getMethod() { return METHOD_NAME; }
public HttpDeleteWithBody(final String uri) {
super();
setURI(URI.create(uri));
}
public HttpDeleteWithBody(final URI uri) {
super();
setURI(uri);
}
public HttpDeleteWithBody() { super(); }
}
And then on my doInBackGround of my Fragment, I do this:
boolean resul = true;
try {
JSONObject usuari = new JSONObject();
try {
usuari.put("idProducte", params[0]);
usuari.put("idusuari", params[1]);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
HttpEntity entity = new StringEntity(usuari.toString());
HttpClient httpClient = new DefaultHttpClient();
HttpDeleteWithBody httpDeleteWithBody = new HttpDeleteWithBody(getResources().getString(R.string.IPAPI) + "produsuaris/produsuari");
httpDeleteWithBody.setEntity(entity);
HttpResponse response = httpClient.execute(httpDeleteWithBody);
Log.d("Response ---------->", response.getStatusLine().toString());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} catch (Exception ex) {
Log.e("ServicioRest", "Error!", ex);
}
return resul;
Furthermore, I've tried to do this:
HttpDeleteWithBody delete = new HttpDeleteWithBody(getResources().getString(R.string.IPAPI) + "produsuaris/produsuari");
StringEntity se = new StringEntity(usuari.toString(), HTTP.UTF_8);
se.setContentType("application/json");
delete.setEntity(se);
however, it doesn't work... the log says:
D/Response ---------->﹕ HTTP/1.1 200 OK
This is how I call the method:
JSONObject deleteproduct = new JSONObject();
try {
deleteproduct.put("idProducte", String.valueOf(IDPROD));
deleteproduct.put("idusuari", String.valueOf(IDUSU));
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.i("Json test per afegir prod --> ", deleteproduct.toString());
TareaWSInsertar tarea = new TareaWSInsertar();
tarea.execute(String.valueOf(IDPROD), String.valueOf(IDUSU));
I've added on my Google Chrome a plug-in called "PostMan" and when I try to do this by this way, it's deleting correctly...
What I'm doing wrong?
EDIT
I tried to use cURL, and this is the result:
It is returning me false, when I put the same JSON as PostMan; nevertheless, if I put the same JSON on PostMan, it works fine.
EDIT 2
I implemented ion library and I did it like :
JSONObject usuari = new JSONObject();
try {
usuari.put("idProducte", params[0]);
usuari.put("idusuari", params[1]);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
String url = getResources().getString(R.string.IPAPI) + "produsuaris/produsuari";
Log.d("CURL", "curl -X DELETE -d '" + usuari.toString() + "' " + url);
Builders.Any.F builder = Ion.with(getActivity().getApplicationContext())
.load(HttpDelete.METHOD_NAME, url)
.setTimeout(15000).setStringBody(usuari.toString());
String response = builder.toString();
Log.d("TEST", "Req response -->" + response);
}
catch (Exception ex){
resul = false;
}
And it still returning that it's OK, and don't delete anything.
This appears to be a server side issue, to be sure of this, do the following:
1) Add Ion as an dependency in your grandle.
compile 'com.koushikdutta.ion:ion:+'
2) Use the following snippen to perform your request:
JSONObject jsonObject = new JSONObject();
try{
for(BasicNameValuePair aNameValue : getParameters()){
jsonObject.put(aNameValue.getName(), aNameValue.getValue());
Log.d("TEST","parameter "+aNameValue.getName()+": "+aNameValue.getValue());
}
jsonObject.put("time_zone", Util.timeZone());
Log.d("TEST","parameter time_zone:"+Util.timeZone());
}catch(Exception e){
//
}
Log.d("CURL", "curl -X DELETE -d '"+jsonObject.toString()+"' "+getUrl());
Builders.Any.F builder = Ion.with(getContext())
.load(HttpDelete.METHOD_NAME, getUrl())
.setTimeout(BuildConfig.HttpClientMaxTimeout).setStringBody(jsonObject.toString());
String response = builder.asString().get();
Util.checkThreadUiException();
Log.d("TEST","-->"+ response);
There's no much rocket science, this is the code that I used in an app, in that method I received the parameters to send as a json, as a BasicNameValuePair collection. You can change that and directly set your json. I'm 100% porcent sure that this request will fail, because this is a server side issue.
UPDATE
JSONObject usuari = new JSONObject();
try {
usuari.put("idProducte", params[0]);
usuari.put("idusuari", params[1]);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String url = getResources().getString(R.string.IPAPI) + "produsuaris/produsuari";
Log.d("CURL", "curl -X DELETE -d '"+usuari.toString()+"' "+url);
Builders.Any.F builder = Ion.with(getContext())
.load(HttpDelete.METHOD_NAME, url)
.setTimeout(BuildConfig.HttpClientMaxTimeout).setStringBody(usuari.toString());
String response = builder.asString().get();
Log.d("TEST","Req response -->"+ response)
UPDATE
Try this, perform this request through curl and let me know the result:
curl --http1.0 -X DELETE -d '{"idusuari":121,"idProducte":15}' 192.168.1.46/ServicioWebRest/api/produsuaris/produsuari
Doing this you're telling to curl to send the request through http 1.0, chunked responses are only supported by http 1.1, if there's an error in the chunk encoding, this should tell you.
Also take a look to this issue that I submitted to Ion long ago. I think that the problem that I was having that time, and your current problem are alike, maybe some of the tips there will help. Specially the part about the addHeader("Connection", "close").
Would look like this:
Builders.Any.F builder = Ion.with(getContext())
.addHeader("Connection", "close")
.load(HttpDelete.METHOD_NAME, getUrl())
.setTimeout(BuildConfig.HttpClientMaxTimeout).setStringBody(jsonObject.toString());
Finally I solved the problem, what I've done is change the HttpDelete method on my API, and instead of send a JSON, I send parameters (like a HttpGet) and now my code is like :
boolean resul = true;
HttpClient httpClient = new DefaultHttpClient();
String id____USER = params[0];
String id____PROD = params[1];
HttpDelete del =
new HttpDelete(getResources().getString(R.string.IPAPI) + "produsuaris/produsuari?idProd=" + Integer.parseInt(id____PROD)+"&idUs="+Integer.parseInt(id____USER));
del.setHeader("content-type", "application/json");
try
{
HttpResponse resp = httpClient.execute(del);
String respStr = EntityUtils.toString(resp.getEntity());
if(!respStr.equals("true"))
resul = false;
}
catch(Exception ex)
{
Log.e("ServicioRest","Error!", ex);
resul = false;
}
return resul;
This is how I call this AsyncMethod
TareaWSInsertar tarea = new TareaWSInsertar();
tarea.execute(String.valueOf(IDUSU),String.valueOf(IDPROD));
This work to me, I know it's not the best solution, but I've no much time, also I tried three solutions and noone didn't work.
Feel free to post a correct answer if you know what I was doing wrong.
I'm learning android by working on a simple project. I have the layout completed and I'm at a point where I need to communicate with the back-end. I've worked with PHP/JSON a lot before and I know exactly what I need to do on the back-end. I have the following two questions,
1 - What kind of adapter I should be using when dealing with JSON? please note that the back-end will be sending 10 records at a time, and the user will scroll up to get the next 10 so the dataset will be changing as the user scrolls the view
2 - I'll be using HTTP to get the JSON data mentioned in point 1, is there a preferred method in android to be used for communication with the back-end?
Please note that I don't want to Parse or any other cloud solutions.
1. You will have to have a something which will communicate with the server for that just copy this code :-
public class ConnectionClass
{
Context context;
public ConnectionClass(Context ctx) {
this.context=ctx;
}
public String connectToServer(String urlLink)
{
try
{
HttpClient client = new DefaultHttpClient();
HttpPost http_get = new HttpPost(urlLink);
HttpResponse responses;
responses = client.execute(http_get);
if (responses != null)
{
InputStream in = responses.getEntity().getContent();
String a = convertStreamToString(in);
return a;
}
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try
{
while ((line = reader.readLine()) != null)
{
sb.append(line);
}
}
catch (Exception e)
{
//Toast.makeText(context, e.toString()+" io2", Toast.LENGTH_LONG).show();
}
finally
{
try
{
is.close();
}
catch (Exception e)
{
}
}
return sb.toString();
}
}
2. To use that and keeping in mind dat newer version of android does not allow executing network operations on mainthread i will give a simple example to run on onCreate() of the activity using AsyncTask this is something like Ajax in web .
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
context=this;
ConnectionClass cc=new ConnectionClass(context);
new AsyncTask<String, Void, String>()
{
#Override
protected String doInBackground(String... arg) {
String data=cc.connectToServer(arg[0]);
return data;
}
protected void onPostExecute(String result)
{
super.onPostExecute(result);
try
{
JSONObject jobj=new JSONObject(result);
String idval=jobj.getString("id");
Toast.makeToast(context,idval,2000).show();
} catch (Exception e)
{
e.printStackTrace();
}
}
}.execute("http://mydomain.com/fetchjson.php");
}
Android has built-in JSON parsing capability and an Http client. Take a look at this stackoverflow post, which has step-by-step instructions for making the Http request and parsing the returned JSON data:
How to parse JSON in Android
However, this post uses the older DefaultHttpClient. This is only recommended for Froyo and below. For newer code, Google recommends that you use HttpURLConnection instead (on Gingerbread and higher API systems). Their function is very similar, here is the reference for Android's HttpURLConnection:
HttpURLConnection | Android Developers