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POParse JSON data into Android ListView
 

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    <p>I've been lurking this site for quite some time now, fortunately until now all my questions have been answered. I was hoping some of you could shed some light on my problem here. I can successfully get a ListView to display an array of strings -- but when I try to parse JSON data into an array -- Well my program just force closes and LogCat doesn't help me much. Anywho -- here is the code I'm using.</p> <pre><code>String[] journals = {"Filler"}; String result; JSONArray jArray[]; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); try{ //http post HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("http://xxx.xxx.xxx.xxx/query.php"); org.apache.http.HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); InputStream is = entity.getContent(); //convert response to string 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(); //I think the problem is somewhere here .... JSONArray jArray = new JSONArray(result); for(int i=0;i&lt;jArray.length();i++){ JSONObject json_data = jArray.getJSONObject(i); journals[i] = json_data.getString("JournalName"); Log.i("log_tag","JournalID: "+json_data.getInt("JournalID") + ",JournalName: " + json_data.getString("JournalName")); } } catch (Exception e) { } //Or here -- I know this code should REALLY be separated and not in onCreate -- I feel like that's half my problem setListAdapter(new ArrayAdapter&lt;String&gt;(this, R.layout.list_item, journals)); ListView lv = getListView(); </code></pre> <p>Thanks in advance guys! I appreciate it.</p> <pre><code>03-07 22:24:33.060: ERROR/AndroidRuntime(7986): FATAL EXCEPTION: main 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): java.lang.RuntimeException: Unable to start activity ComponentInfo{Andrew.Badura.A4A.com/Andrew.Badura.A4A.com.SurvAcademia}: java.lang.RuntimeException: Unable to start activity ComponentInfo{Andrew.Badura.A4A.com/Andrew.Badura.A4A.com.JournalActivity}: java.lang.NullPointerException 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.os.Handler.dispatchMessage(Handler.java:99) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.os.Looper.loop(Looper.java:123) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread.main(ActivityThread.java:4627) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at java.lang.reflect.Method.invokeNative(Native Method) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at java.lang.reflect.Method.invoke(Method.java:521) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at dalvik.system.NativeStart.main(Native Method) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{Andrew.Badura.A4A.com/Andrew.Badura.A4A.com.JournalActivity}: java.lang.NullPointerException 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:654) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.widget.TabHost.setCurrentTab(TabHost.java:326) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.widget.TabHost.addTab(TabHost.java:216) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at Andrew.Badura.A4A.com.SurvAcademia.onCreate(SurvAcademia.java:25) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): ... 11 more 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): Caused by: java.lang.NullPointerException 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at java.util.Arrays$ArrayList.&lt;init&gt;(Arrays.java:49) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at java.util.Arrays.asList(Arrays.java:171) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.widget.ArrayAdapter.&lt;init&gt;(ArrayAdapter.java:125) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at Andrew.Badura.A4A.com.JournalActivity.onCreate(JournalActivity.java:69) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 03-07 22:24:33.060: ERROR/AndroidRuntime(7986): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) </code></pre>
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    1. COEven if logcat output is not helpful, you should still post the Exception here..
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    2. COActually -- I lied -- Basically all that will happen is that the ListView will display "Filler". When In reality, I just want that to be there just as a place holder. When I just initialize the string journals with nothing in the array, I get LogCat errors. I will edit them in -- I'm fairly certain it talks of a NullPointerException
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