NullPointerException in getView user adapter

Question

I am encoding a custom adapter for a ListView that has a custom list.

obviously i have to write getView function. so here is my code:

 /*1*/ public View getView(int position, View convertView, ViewGroup parent) { /*2*/ View vi = convertView; /*3*/ if (convertView == null) /*4*/ vi = inflater.inflate(R.layout.result_list_item, null); /*5*/ /*6*/ TextView title = (TextView) vi.findViewById(R.id.tvTitle); /*7*/ TextView subtitle = (TextView) vi.findViewById(R.id.tvSubTitle); /*8*/ ImageView image = (ImageView) vi.findViewById(R.id.imageView1); /*9*/ /*10*/ title.setText(data.get(position).getDescription().toString()); /*11*/ subtitle.setText(data.get(position).getDate().toString()); /*12*/ String img = "http://someLink/" + data.get(position).getId() + "a_t.jpg"; /*13*/ imageLoader.DisplayImage(img, image); /*14*/ return vi; /*15*/ } 

But I noticed that on line number 6 the program crashes due to a NullPointer exception.

here is my crash report:

 04-18 09:33:32.745: E/AndroidRuntime(2209): FATAL EXCEPTION: main 04-18 09:33:32.745: E/AndroidRuntime(2209): java.lang.NullPointerException 04-18 09:33:32.745: E/AndroidRuntime(2209): at com.package.mojo.NoPicAdapter.getView(NoPicAdapter.java:46) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.AbsListView.obtainView(AbsListView.java:1554) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.ListView.measureHeightOfChildren(ListView.java:1264) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.ListView.onMeasure(ListView.java:1175) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.View.measure(View.java:8366) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.View.measure(View.java:8366) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.View.measure(View.java:8366) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.LinearLayout.measureVertical(LinearLayout.java:531) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.View.measure(View.java:8366) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.View.measure(View.java:8366) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.ViewRoot.performTraversals(ViewRoot.java:847) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.view.ViewRoot.handleMessage(ViewRoot.java:1868) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.os.Handler.dispatchMessage(Handler.java:99) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.os.Looper.loop(Looper.java:123) 04-18 09:33:32.745: E/AndroidRuntime(2209): at android.app.ActivityThread.main(ActivityThread.java:3691) 04-18 09:33:32.745: E/AndroidRuntime(2209): at java.lang.reflect.Method.invokeNative(Native Method) 04-18 09:33:32.745: E/AndroidRuntime(2209): at java.lang.reflect.Method.invoke(Method.java:507) 04-18 09:33:32.745: E/AndroidRuntime(2209): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847) 04-18 09:33:32.745: E/AndroidRuntime(2209): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605) 04-18 09:33:32.745: E/AndroidRuntime(2209): at dalvik.system.NativeStart.main(Native Method) 

Of course, the layout and elements themselves exist ...

any thoughts?

update: when I look at variables during debugging, I see that vi not overestimated ( vi == null ), why?

Answer 1

Change this:

 vi = inflater.inflate(R.layout.result_list_item, null); 

For this:

 vi = inflater.inflate(R.layout.result_list_item, parent, false); 

---

this is how your adapter should be:

 public class NoPicAdapter extends ArrayAdapter<NewAndCalendar> { private ArrayList<NewAndCalendar> data; private Activity mActivity; private LayoutInflater inflater = null; public NoPicAdapter(Activity a, ArrayList<NewAndCalendar> d) { super(a, R.layout.no_pic_list_item, d); mActivity = a; data = d; inflater = (LayoutInflater) mActivity .getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public View getView(int position, View convertView, ViewGroup parent) { View vi = convertView; if (vi == null) vi = inflater.inflate(R.layout.no_pic_list_item, parent, false); TextView title = (TextView) vi.findViewById(R.id.noPicTitle); TextView subtitle = (TextView) vi.findViewById(R.id.noPicSubtitle); title.setText(data.get(position).getmTitle()); subtitle.setText(data.get(position).getmPubDate()); return vi; } } 

Answer 2

try it

vi = LayoutInflater.from (mActivity) .inflate (R.layout.result_list_item, null);

if mActivity is your Activity context passed from the action in which you create the object of this adapter.

Answer 3

Do you initialize the inflation? if not initialize it.

 inflater = getLayoutInflater(); 

or

  inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);