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POjava.lang.NullPointerException while trying to add data to object of class in Android
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copied!<p>I am facing a silly problem. I am simply trying to add data to an object of my class, and not succeeding.</p> <p>I am fetching data via an Asynchronous task inside my fragment and want to use the resulting JSON to fill my ListView. I am using an ArrayAdapter and have created a class for this purpose.</p> <p>I have parsed the JSON String and now I am trying to add the data retrieved from the API to the object of my class, but it gives me 'java.lang.NullPointerException'.</p> <p>I guess I am not being able to add data to the object of my class. But I fail to understand the reason, I am more used to cding in C#, but JAVA being Object_Oriented, it should be the same, right? The code being used is as below...</p> <pre><code> JSONArray jsonArrayPendingBills = new JSONArray(); jsonArrayPendingBills = jsonObjectPendingBills.getJSONArray(TAG_RESPONSE_MESSAGE); ArrayList<HashMap<String, String>> arrayPendingBills = new ArrayList<HashMap<String,String>>(); ArrayList<PendingBills> arrayClassPendingBills = new ArrayList<PendingBills>(); for(int i = 0;i < jsonArrayPendingBills.length(); i++){ JSONObject jsonObjectPendingBill = jsonArrayPendingBills.getJSONObject(i); String strDate = jsonObjectPendingBill.getString(TAG_PENDING_BILLS_DATE); String strTxCode = jsonObjectPendingBill.getString(TAG_PENDING_BILLS_TX_CODE); String strFromAccount = jsonObjectPendingBill.getString(TAG_PENDING_BILLS_FROM_ACCOUNT); String strAmount = jsonObjectPendingBill.getString(TAG_PENDING_BILLS_AMOUNT); String strDetails = jsonObjectPendingBill.getString(TAG_PENDING_BILLS_DETAILS); String strBillCode = jsonObjectPendingBill.getString(TAG_PENDING_BILLS_BILL_CODE); PendingBills objPendingBills = new PendingBills(); objPendingBills.setBillAmount(strAmount); objPendingBills.setBillDate(strDate); objPendingBills.setBillName(strFromAccount); //arrayClassPendingBills.add(new PendingBills(strAmount, strDate, strFromAccount)); arrayClassPendingBills.add(objPendingBills); } PendingBillsAdapter pendingBillsAdapter = new PendingBillsAdapter(getActivity(), R.layout.pending_bills_list_view_row, arrayClassPendingBills); listViewPendingBills.setAdapter(pendingBillsAdapter); progressDialogPendingBills.dismiss(); } catch (Exception e){ e.printStackTrace(); Log.i("Error", "Error", e); } </code></pre> <p>This is the code for my class:</p> <pre><code>public class PendingBills { // Declaring the strings for the class public String BillAmount; public String BillDate; public String BillName; // Writing down the constructor for this class public PendingBills(String BillAmount, String BillDate, String BillName){ this.BillAmount = BillAmount; this.BillDate = BillDate; this.BillName = BillName; } public PendingBills(){ } // Getter for BillAmount public String getBillAmount(){ return BillAmount; } // Setter for BillAmount public void setBillAmount(String BillAmount){ this.BillAmount = BillAmount; } public String getBillDate(){ return BillDate; } public void setBillDate(String BillDate){ this.BillDate = BillDate; } public String getBillName(){ return BillName; } public void setBillName(String BillName){ this.BillName = BillName; } } </code></pre> <p>I think I am missing something. I am not sure what? I have looked up a few questions on StackOverflow relating to this. I found many of them, but the solutions did not work for me.</p> <p><a href="https://stackoverflow.com/questions/13670403/adding-data-to-an-array-list">Adding data to an array list</a></p> <p><a href="https://stackoverflow.com/questions/18388629/how-to-properly-add-data-to-arraylist-android">How to properly add data to ArrayList - Android</a></p> <p>Any help will be appreciated. Thank you.</p> <p>Here is the LogCat....</p> <pre><code>12-02 07:02:04.235: E/AndroidRuntime(4648): FATAL EXCEPTION: main 12-02 07:02:04.235: E/AndroidRuntime(4648): java.lang.NullPointerException 12-02 07:02:04.235: E/AndroidRuntime(4648): at com.zipcash.zipcashbetaversion.PendingBillsAdapter.getView(PendingBillsAdapter.java:43) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.AbsListView.obtainView(AbsListView.java:2159) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.ListView.measureHeightOfChildren(ListView.java:1246) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.ListView.onMeasure(ListView.java:1158) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1029) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 12-02 07:02:04.235: E/AndroidRuntime(4648): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.View.measure(View.java:15518) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.Choreographer.doFrame(Choreographer.java:532) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.os.Handler.handleCallback(Handler.java:725) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.os.Handler.dispatchMessage(Handler.java:92) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.os.Looper.loop(Looper.java:137) 12-02 07:02:04.235: E/AndroidRuntime(4648): at android.app.ActivityThread.main(ActivityThread.java:5041) 12-02 07:02:04.235: E/AndroidRuntime(4648): at java.lang.reflect.Method.invokeNative(Native Method) 12-02 07:02:04.235: E/AndroidRuntime(4648): at java.lang.reflect.Method.invoke(Method.java:511) 12-02 07:02:04.235: E/AndroidRuntime(4648): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-02 07:02:04.235: E/AndroidRuntime(4648): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-02 07:02:04.235: E/AndroidRuntime(4648): at dalvik.system.NativeStart.main(Native Method) </code></pre>

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