Android listView adaptor error
I define this String Array:
String[] mCountryList = new String[200];
and fill up the variable with JSON data, and when I use that variable with an ArrayAdapter :
ArrayAdapter<String> myAdaptor = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, mCountryList);
I get this error:
java.lang.NullPointerException
I think the String array mCountryList can have null values. For example:
mCountryList[0]="x";
mCountryList[1]="x";
mCountryList[2]=null;
How can I solve this?
The stacktrace I get is:
2459-2459/com.example.behzad.behmytour E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.behzad.behmytour, PID: 2459 java.lang.NullPointerException at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394) at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) at android.widget.AbsListView.obtainView(AbsListView.java:2263) at android.widget.ListView.makeAndAddView(ListView.java:1790) at android.widget.ListView.fillDown(ListView.java:691) at android.widget.ListView.fillFromTop(ListView.java:752) at android.widget.ListView.layoutChildren(ListView.java:1630) at android.widget.AbsListView.onLayout(AbsListView.java:2091) at android.view.View.layout(View.java:14817) at android.view.ViewGroup.layout(ViewGroup.java:4631)
Looks like one of your items is null , like you probably thought, but didn't express easily understandable in your question. The solution is, make sure it's not.
NullPointerException at android widget ArrayAdapter createViewFromResource
You might want to use a List instead of an array, and then only populate as many items as you have instead of having a static array with 200 items, unless of course you will always have 200 items.
So use:
List<String> mCountryList = new ArrayList<String>();
instead of
String[] mCountryList=new String[200];
and then to populate it, something like this:
mCountryList.add("Your String");
I think your error is in code mCountryList[2]=null; Even though this is allowed, it is not a good idea to initialize a string to null, certainly not common in Java. Only objects can be set to null.
Suggestion : mCountryList[2]= ""; Set to a blank string instead.