Wednesday, 29 March 2017

android.os.NetworkOnMainThreadException with android 4.2




Here i am using this code load Json. It is work fine with android 2.2 but when i am using android 4.2 it throws android.os.NetworkOnMainThreadException exception please give me solution



 public class JSONParser {


static InputStream is = null;

static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}


public JSONObject getJSONFromUrl(String url) {

// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpPost = new HttpGet(url);

HttpResponse getResponse = httpClient.execute(httpPost);

final int statusCode = getResponse.getStatusLine().getStatusCode();

if (statusCode != HttpStatus.SC_OK) {
Log.w(getClass().getSimpleName(),
"Error " + statusCode + " for URL " + url);
return null;
}

HttpEntity getResponseEntity = getResponse.getEntity();


//HttpResponse httpResponse = httpClient.execute(httpPost);
//HttpEntity httpEntity = httpResponse.getEntity();
is = getResponseEntity.getContent();

} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
Log.d("IO", e.getMessage().toString());

e.printStackTrace();

}

try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {

sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}

// try parse the string to a JSON object
try {

jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}

// return JSON String
return jObj;

}



}



i am also using google api.


Answer



Write below code into your MainActivity file after setContentView(R.layout.activity_main);



if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

}


And below import statement into your java file.



import android.os.StrictMode;

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