Problem Passing ArrayList from one Activity to Another

i'm continuously running into problems trying to pass an ArrayList from one Activity to another. My code is failing with a Null Pointer Exception when i try to iterate through the A开发者_运维技巧rrayList in my XMLParser Class. I've put print statements into the Activity that generates the ArrayList and it looks fine. Can anyone see what i'm doing wrong or why i get a Null pointer Exception when retrieving the ArrayList?

public void onClick(View v) {
    if (selItemArray[0] == null) {
        Toast.makeText(getApplicationContext()," Please make a Selection ", Toast.LENGTH_SHORT).show();
    } else {
        Intent intent = new Intent(Recipes2.this, XMLParser.class);
        Log.v("Recipes2", "selItemArray[0] before call to XML Parser : " + selItemArray[0]);
      //Log.v("Recipes2", "selItemArray[1] before call to XML Parser : " + selItemArray[1]);    
        intent.putExtra("items_to_parse",  selItemArray);
        startActivityForResult(intent, 0);              
    }
}




public class XMLParser extends ListActivity {
            /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //Bundle b = getIntent().getExtras();
        //itemsToParse = b.getStringArrayList("items_to_parse");
        ArrayList<String> itemsToParse = new ArrayList<String>();
        itemsToParse = getIntent().getExtras().getStringArrayList("items_to_parse");        Iterator<String> iterator = itemsToParse.iterator();            while(iterator.hasNext())
                Log.v("XMLParser", iterator.next().toString());

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It looks like you're putting a String array, not a ArrayList<String>.

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You used a string array on the "sender" side and are trying to get it back as an ArrayList on the receiver side. That won't work. Use a String array on both sides and -- if necessary -- pull it into an array list.

The procedure for passing the data is here:

Passing String array between two class in android application

To convert it to a List - simply do:

List<String> = Arrays.asList(stringArray);