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POBaseAdapter class wont setAdapter inside Asynctask - Android
 

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  1. POBaseAdapter class wont setAdapter inside Asynctask - Android
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    <p>I have asynctask that gathers usernames, comments, and numbers. It places them into strings and is then suppose to call a BaseAdapter class, create an adapter, and set the adapter to the class. But my code doesn't work, it crashes the app, here is my code</p> <pre><code> public class DashboardActivity extends ListActivity { String comments[]; String usernames[]; String numbers[]; ListView lstComments; class CreateCommentLists extends BaseAdapter{ Context ctx_invitation; String[] listComments; String[] listNumbers; String[] listUsernames; public CreateCommentLists(String[] comments, String[] usernames, String[] numbers) { super(); listComments = comments; listNumbers = usernames; listUsernames = numbers; } @Override public int getCount() { if(null == listComments) { return 0; } // TODO Auto-generated method stub return listComments.length; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return listComments[position]; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub View v = null; try { String inflater = Context.LAYOUT_INFLATER_SERVICE; LayoutInflater li = (LayoutInflater)ctx_invitation.getSystemService(inflater); v = li.inflate(R.layout.list_item, null); TextView commentView = (TextView)v.findViewById(R.id.listComment); TextView NumbersView = (TextView)v.findViewById(R.id.listNumber); TextView usernamesView = (TextView)v.findViewById(R.id.listPostedBy); commentView.setText(listComments[position]); NumbersView.setText(listNumbers[position]); usernamesView.setText(listUsernames[position]); } catch(Exception e) { e.printStackTrace(); } return v; } } class loadComments extends AsyncTask&lt;JSONObject, String, JSONObject&gt; { @Override protected void onPreExecute() { super.onPreExecute(); } @Override protected void onProgressUpdate(String... values) { super.onProgressUpdate(values); } protected JSONObject doInBackground(JSONObject... params) { JSONObject json2 = CollectComments.collectComments(usernameforcomments, offsetNumber); return json2; } @Override protected void onPostExecute(JSONObject json2) { try { if (json2.getString(KEY_SUCCESS) != null) { registerErrorMsg.setText(""); String res2 = json2.getString(KEY_SUCCESS); if(Integer.parseInt(res2) == 1){ JSONArray commentArray = json2.getJSONArray(KEY_COMMENT); String comments[] = new String[commentArray.length()]; for ( int i=0; i&lt;commentArray.length(); i++ ) { comments[i] = commentArray.getString(i); } JSONArray numbersArray = json2.getJSONArray(KEY_NUMBER); String numbers[] = new String[numbersArray.length()]; for ( int i=0; i&lt;numbersArray.length(); i++ ) { numbers[i] = numbersArray.getString(i); } JSONArray usernameArray = json2.getJSONArray(KEY_USERNAME); String usernames[] = new String[usernameArray.length()]; for ( int i=0; i&lt;usernameArray.length(); i++ ) { usernames[i] = usernameArray.getString(i); } CreateCommentLists mycmlist = new CreateCommentLists(comments, usernames, numbers); lstComments = (ListView)findViewById(android.R.id.list); lstComments.setAdapter(mycmlist); }//end if key is == 1 else{ // Error in registration registerErrorMsg.setText(json2.getString(KEY_ERROR_MSG)); }//end else }//end if } //end try catch (JSONException e) { e.printStackTrace(); }//end catch } } new loadComments().execute(); } </code></pre> <p>Here is my logCat</p> <pre><code> 07-17 17:07:13.436: E/AndroidRuntime(23880): FATAL EXCEPTION: main 07-17 17:07:13.436: E/AndroidRuntime(23880): java.lang.NullPointerException 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.ListView.measureScrapChild(ListView.java:1163) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.ListView.measureHeightOfChildren(ListView.java:1294) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.ListView.onMeasure(ListView.java:1155) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4706) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:579) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:392) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4706) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1017) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.LinearLayout.onMeasure(LinearLayout.java:555) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4706) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.LinearLayout.measureVertical(LinearLayout.java:812) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4706) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4706) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-17 17:07:13.436: E/AndroidRuntime(23880): at com.navdrawer.SimpleSideDrawer.onMeasure(SimpleSideDrawer.java:443) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4706) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-17 17:07:13.436: E/AndroidRuntime(23880): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2162) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.View.measure(View.java:13011) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1091) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2505) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.os.Handler.dispatchMessage(Handler.java:99) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.os.Looper.loop(Looper.java:154) 07-17 17:07:13.436: E/AndroidRuntime(23880): at android.app.ActivityThread.main(ActivityThread.java:4945) 07-17 17:07:13.436: E/AndroidRuntime(23880): at java.lang.reflect.Method.invokeNative(Native Method) 07-17 17:07:13.436: E/AndroidRuntime(23880): at java.lang.reflect.Method.invoke(Method.java:511) 07-17 17:07:13.436: E/AndroidRuntime(23880): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 07-17 17:07:13.436: E/AndroidRuntime(23880): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 07-17 17:07:13.436: E/AndroidRuntime(23880): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. COPlease take a look at my answer. I have added some code.
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      1. USVikram
 

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