JensJensen JensJensen - 6 months ago 325
Android Question

UTF-8 encoding in Volley Requests

In my Android app I am loading json data with a Volley

JsonArrayRequest
. The data were created by myself and I saved them with Sublime with UTF-8 encoding. When I get the
Response
and fill my
ListView
, the texts are not displayed correctly (umlauts). This is what my Request looks like:

JsonArrayRequest request = new JsonArrayRequest(targetUrl,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(final JSONArray response) {
try {
fillList(response);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {

}
});
requestQueue.add(request);


When I load the exact same data with this method, all texts are displayed correctly:

final StringBuilder builder = new StringBuilder();
final HttpClient client = new DefaultHttpClient();
final HttpGet httpGet = new HttpGet(request);
try {
final HttpResponse response = client.execute(httpGet);
final StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
final HttpEntity entity = response.getEntity();
final InputStream content = entity.getContent();
final BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {

}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}


So to me it seems like there is no problem with the encoding of my json file. How can I fix this encoding problem in Volley?

Answer

If you know that absolutely all of the files you are requesting will be in the UTF-8 format, which it sounds like you do, then you might consider forcing your Volley request to return UTF-8 formatted strings. You could accomplish this by subclassing the standard JSON request. Something like this:

public class Utf8JsonRequest extends JsonRequest<JSONObject> {
    ...
    @Override
    protected Response<JSONObject> parseNetworkResponse (NetworkResonse response) {
        try {
            String utf8String = new String(response.data, "UTF-8");
            return Response.success(new JSONObject(utf8String), HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException e) {
            // log error
        } catch (JSONException e) {
            // log error
        }
    }
}
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