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POAndroid HTTP Request Crashes App before even making a request
 

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  1. POAndroid HTTP Request Crashes App before even making a request
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/11736530/android-httpclient-networkonmainthreadexception">Android HttpClient : NetworkOnMainThreadException</a> </p> </blockquote> <p>I am working on an application that is making requests, and the app works fine, up until I have to make a request to the server. I am using the same code as it was written before for the same app, but this has been revised.</p> <p>Fragment Class That Handles Click:</p> <pre><code>import org.json.JSONException; import org.json.JSONObject; import org.myapp.app.utils.API; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class FragmentStudentLogin extends Fragment implements OnClickListener { EditText uN, pW; Button signin; private API api; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.fragment_login, container, false); signin = (Button)v.findViewById(R.id.s_sign_in); signin.setOnClickListener(this); uN = (EditText)v.findViewById(R.id.f_t_s_username); pW = (EditText)v.findViewById(R.id.f_t_s_password); api = new API(); return v; } public void onClick(View v){ switch(v.getId()) { case R.id.s_sign_in: String user = uN.getText().toString(); String pass = pW.getText().toString(); if(user.length()==0){ PopIt("Please enter your username."); } else if(pass.length()==0){ PopIt("Please enter your password."); } else { try { JSONObject json; json = api.login(user, pass); if(json == null || json.isNull("status")){ PopIt(getString(R.string.error_network)); } else { PopIt(json.getString("msg")); } } catch (JSONException e){ } } break; } } public void PopIt(String msg){ Toast.makeText(getActivity(), msg, Toast.LENGTH_SHORT).show(); } } </code></pre> <p>Class that Click makes a call to:</p> <pre><code>import java.util.ArrayList; import java.util.List; import org.apache.http.NameValuePair; import org.apache.http.message.BasicNameValuePair; import org.json.JSONObject; import org.myapp.app.utils.JSONParser; public class API { private JSONParser jsonParser; private static String serverURL = "http://mydomain.com/api/device/login"; public API(){ jsonParser = new JSONParser(); } public JSONObject login(String uN, String pW) { List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;(); params.add(new BasicNameValuePair("username", uN)); params.add(new BasicNameValuePair("password", pW)); JSONObject json = jsonParser.getJSONFromUrl(serverURL, params); return json; } </code></pre> <p>Class that Processes Requests:</p> <pre><code>import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import java.util.List; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.json.JSONException; import org.json.JSONObject; import android.util.Log; public class JSONParser { InputStream is = null; JSONObject jObj = null; String json = ""; // constructor public JSONParser() { } public JSONObject getJSONFromUrl(String url, List&lt;NameValuePair&gt; params) { // Making HTTP request try { // defaultHttpClient DefaultHttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(url); httpPost.setEntity(new UrlEncodedFormEntity(params)); HttpResponse httpResponse = httpClient.execute(httpPost); HttpEntity httpEntity = httpResponse.getEntity(); is = httpEntity.getContent(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { 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(); Log.e("JSON", json); } 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; } } </code></pre> <p>LogCat</p> <pre><code>10-02 19:40:23.734: E/AndroidRuntime(4401): FATAL EXCEPTION: main 10-02 19:40:23.734: E/AndroidRuntime(4401): android.os.NetworkOnMainThreadException 10-02 19:40:23.734: E/AndroidRuntime(4401): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099) 10-02 19:40:23.734: E/AndroidRuntime(4401): at java.net.InetAddress.lookupHostByName(InetAddress.java:391) 10-02 19:40:23.734: E/AndroidRuntime(4401): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242) 10-02 19:40:23.734: E/AndroidRuntime(4401): at java.net.InetAddress.getAllByName(InetAddress.java:220) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.myapp.app.utils.JSONParser.getJSONFromUrl(JSONParser.java:42) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.myapp.app.utils.API.studentLogin(API.java:26) 10-02 19:40:23.734: E/AndroidRuntime(4401): at org.myapp.app.FragmentStudentLogin.onClick(FragmentStudentLogin.java:52) 10-02 19:40:23.734: E/AndroidRuntime(4401): at android.view.View.performClick(View.java:3511) 10-02 19:40:23.734: E/AndroidRuntime(4401): at android.view.View$PerformClick.run(View.java:14109) 10-02 19:40:23.734: E/AndroidRuntime(4401): at android.os.Handler.handleCallback(Handler.java:605) 10-02 19:40:23.734: E/AndroidRuntime(4401): at android.os.Handler.dispatchMessage(Handler.java:92) 10-02 19:40:23.734: E/AndroidRuntime(4401): at android.os.Looper.loop(Looper.java:137) 10-02 19:40:23.734: E/AndroidRuntime(4401): at android.app.ActivityThread.main(ActivityThread.java:4424) 10-02 19:40:23.734: E/AndroidRuntime(4401): at java.lang.reflect.Method.invokeNative(Native Method) 10-02 19:40:23.734: E/AndroidRuntime(4401): at java.lang.reflect.Method.invoke(Method.java:511) 10-02 19:40:23.734: E/AndroidRuntime(4401): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 10-02 19:40:23.734: E/AndroidRuntime(4401): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 10-02 19:40:23.734: E/AndroidRuntime(4401): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Like I said, This code worked before, "Class that Click makes a call to:", and "Class that Processes Requests:" sections, I have used before with no problems. Android API 16 is being used on a 7" Tablet. Would greatly appreciate any help.</p>
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