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POError in HTTP connection on Android 4 or higher?
 

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    <p>I'm trying to get information from a JSON-file using <code>HTTPCLient</code>. The strange thing is that when I run the application on my own phone (HTC Desire HD with Android 2.3) or on the emulator with Android 2.1 everything works. But when I run my application on the emulator with Android 4.1.2, on a HTC One X (Android 4.1.1) or on a Samsung Galaxy SIII (Android 4.0.4) the application crashes (see stacktrace at the end of the post). </p> <p>Does anyone know what the problem is? And if not, is there another way to call my JSONfile? Maybe then it will work..</p> <p>I really hope someone can help me, please tell me if my question isn't clear enough.</p> <p>RoosterWijzigingen.java (there is some code missing to make it shorter, because it's not relevant for the question):</p> <pre><code>package pws.sgdbroosterapp; public class RoosterWijzigingen extends ListActivity { JSONArray jArray; String result = null; InputStream is = null; StringBuilder sb = null; JSONArray klassen = null; JSONArray mededelingen = null; JSONArray rooster = null; String status = null; String type = null; String datum = null; String versie = null; String minutenperlesuur = null; String afwezig = null; String mededeling = null; @Override public void onCreate(Bundle savedInstanceState) { this.requestWindowFeature(Window.FEATURE_NO_TITLE); super.onCreate(savedInstanceState); JSONObject json = JSONfunctions.getJSONfromURL("http://selenight.nl/Wijzigingen/2.1/wijzigingen.json"); //new AsyncTask&lt;Void, Void, String&gt;() { //@Override //protected String doInBackground(Void... params) { // Runs on own thread //JSONObject json = JSONfunctions.getJSONfromURL("http://selenight.nl/Wijzigingen/2.1/wijzigingen.json"); //return json.toString(); //} //protected void onPostExecute(String result) { // someMethod(Send json); //Log.v("Stackoverflow", result); //} //}.execute(); try{ // Getting Array of Klassen klassen = json.getJSONArray("klassen"); // Status, type, datum, versie, minutenperlesuur, afwezig en medeleningen worden uit JSOn file gehaald en opgeslagen in Strings status = json.getString("status"); //"failure"; type = json.getString("type"); datum = json.getString("datum"); versie = json.getString("versie"); minutenperlesuur = json.getString("minutenperlesuur"); afwezig = json.getString("afwezig"); mededelingen = json.getJSONArray("mededelingen"); mededeling = mededelingen.toString(); }catch(JSONException e) { Log.e("log_tag", "Error parsing data "+e.toString()); } setContentView(R.layout.listplaceholder); if(Integer.parseInt(minutenperlesuur) &lt; 50){ TextView verkortrooster = new TextView(this); verkortrooster.setText("--- Het is "+minutenperlesuur+"min-rooster! --- "); } TextView statusdatum = new TextView(this); statusdatum.setText("Dit is versie "+versie+" van "+datum+". \n"); TextView afwezigt = new TextView(this); afwezigt.setText("Afwezig:"); TextView afwezigtextt = new TextView(this); afwezigtextt.setText(afwezig+"\n"); TextView mededelingent = new TextView(this); mededelingent.setText("Mededelingen:"); TextView mededelingentextt = new TextView(this); mededelingentextt.setText(mededeling+"\n \n"); } @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(Menu.NONE, 0, 0, "Settings"); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case 0: startActivity(new Intent(this, Preferences.class)); return true; } return false; } } </code></pre> <p>JSONfunctions.java:</p> <pre><code>public class JSONfunctions { public static JSONObject getJSONfromURL(String url){ InputStream is = null; String result = ""; JSONObject jArray = null; //http post try { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(url); HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); is = entity.getContent(); } catch(Exception e) { Log.e("log_tag", "Error in http connection" + e.toString()); } //convert response to string 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(); result = sb.toString(); } catch(Exception e) { Log.e("log_tag", "Error converting result" + e.toString()); } try { jArray = new JSONObject(result); } catch(JSONException e) { Log.e("log_tag", "Error parsing data "+e.toString()); } return jArray; } } </code></pre> <p>Manifest file:</p> <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="pws.sgdbroosterapp" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name=".MainActivity" android:configChanges="orientation|keyboardHidden" android:screenOrientation="portrait" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name=".Roosterwijziging" android:configChanges="orientation|keyboardHidden" android:screenOrientation="portrait" &gt; &lt;/activity&gt; &lt;activity android:name=".RoosterWijzigingen" android:configChanges="orientation|keyboardHidden" android:screenOrientation="portrait" &gt; &lt;/activity&gt; &lt;activity android:name=".Preferences" android:configChanges="orientation|keyboardHidden" android:screenOrientation="portrait" &gt; &lt;/activity&gt; &lt;uses-library android:name="android.test.runner" android:required="true" /&gt; &lt;/application&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;/manifest&gt; </code></pre> <p>Stacktrace:</p> <pre><code>01-05 15:12:49.995: E/log_tag(615): Error in http connection android.os.NetworkOnMainThreadException 01-05 15:12:49.995: E/log_tag(615): Error converting result java.lang.NullPointerException 01-05 15:12:49.995: E/log_tag(615): Error parsing data org.json.JSONException: End of input at character 0 of 01-05 15:12:50.005: D/AndroidRuntime(615): Shutting down VM 01-05 15:12:50.005: W/dalvikvm(615): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 01-05 15:12:50.015: E/AndroidRuntime(615): FATAL EXCEPTION: main 01-05 15:12:50.015: E/AndroidRuntime(615): java.lang.RuntimeException: Unable to start activity ComponentInfo{pws.sgdbroosterapp/pws.sgdbroosterapp.RoosterWijzigingen}: java.lang.NullPointerException 01-05 15:12:50.015: E/AndroidRuntime(615): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.app.ActivityThread.access$600(ActivityThread.java:130) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.os.Handler.dispatchMessage(Handler.java:99) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.os.Looper.loop(Looper.java:137) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.app.ActivityThread.main(ActivityThread.java:4745) 01-05 15:12:50.015: E/AndroidRuntime(615): at java.lang.reflect.Method.invokeNative(Native Method) 01-05 15:12:50.015: E/AndroidRuntime(615): at java.lang.reflect.Method.invoke(Method.java:511) 01-05 15:12:50.015: E/AndroidRuntime(615): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 01-05 15:12:50.015: E/AndroidRuntime(615): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 01-05 15:12:50.015: E/AndroidRuntime(615): at dalvik.system.NativeStart.main(Native Method) 01-05 15:12:50.015: E/AndroidRuntime(615): Caused by: java.lang.NullPointerException 01-05 15:12:50.015: E/AndroidRuntime(615): at pws.sgdbroosterapp.RoosterWijzigingen.onCreate(RoosterWijzigingen.java:153) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.app.Activity.performCreate(Activity.java:5008) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 01-05 15:12:50.015: E/AndroidRuntime(615): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) </code></pre>
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