Strange problem with Spring RestTemplate in Android applications
I started using the Spring Framework’s RESTful APIs in my android client applications. But I ran into problems when I tried to perform an HTTP request through the postForObject/postForEntity method. Here is my code:
public String _URL = "https://someservice/mobile/login";
public void BeginAuthorization(View view)
{
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> _entity = new HttpEntity<String>(requestHeaders);
RestTemplate templ = new RestTemplate();
templ.setRequestFactory(new HttpComponentsClientHttpRequestFactory());
templ.getMessageConverters().add(new MappingJacksonHttpMessageConverter());
ResponseEntity<String> _response = templ.postForEntity(_URL,_entity,String.class); //HERE APP CRASHES
String _body = _response.getBody();
So the question is what am I doing wrong? How to solve this problem? Is there another way?
I really need help. Thanks in advance!
Solution
I think your app target is Android 4.0-4.2. Then you must do everything in the background, not the main (UI) thread. As I can see, you are going through the authorization process. This is a short operation, so you’d better use AsyncTask
it for this . Here’s how to do it on androidDevelopers:
http://developer.android.com/reference/android/os/AsyncTask.html
You should override doInBackground(Params…) in this way:
class LoginTask extends AsyncTask<String,Void,Void>
{
@Override
protected Void doInBackground(String... params) {
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> _entity = new HttpEntity<String>(requestHeaders);
RestTemplate templ = new RestTemplate();
templ.setRequestFactory(new HttpComponentsClientHttpRequestFactory());
templ.getMessageConverters().add(new MappingJacksonHttpMessageConverter());
ResponseEntity<String> _response = templ.postForEntity(params[0],_entity,null) //null here in order there wasn't http converter errors because response type String and [text/html] for JSON are not compatible;
String _body = _response.getBody();
return null;
}
}
Then call it in your BeginAuthorization(View view):
new LoginTask().execute(URL);
P.S. Also, if you write Java, use the correct naming convention. Instead of this _response
please write response
.