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From: Dirk Bruere at NeoPax <dirk.bruere@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: ArrayAdapter
Date: Sun, 03 Apr 2011 01:41:37 +0100
Organization: Dirk Bruere at Neopax
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On 02/04/2011 23:50, Lawrence D'Oliveiro wrote:
> In message<8vonp8FvbaU4@mid.individual.net>, Dirk Bruere at NeoPax wrote:
>
>> What does passing context to a class mean if every item and method in it
>> is static?
>
> You don’t have to pass any arguments to your own method calls that you don’t
> need.
>
> If the system is calling you, that’s a different matter. But then you
> usually just pass the same arguments to super.whatever, do your own
> processing on what you want and ignore the rest.


This bit of code works in that the adapter is set on the listview with 
no problems

public class controller extends Activity
{

	/** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         Context currentContext = this;



         //@SuppressWarnings("unused")
		//final Data data = new Data(currentContext);

         ArrayAdapter<String> myAdapter;
         ListView lvRadio;

         ArrayList<String> radioTitleArrayList = new ArrayList<String>();
     	

         lvRadio = (ListView)findViewById(R.id.ListViewRadio);
         lvRadio.setClickable(true);
         lvRadio.setOnItemClickListener(new 
AdapterView.OnItemClickListener() {
    			@Override public void onItemClick(AdapterView<?> lv, View view, 
int arg2, long arg3) { BlinkAPI.playNetRadio(arg2);    }});
         myAdapter = new 
ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1,radioTitleArrayList);

         lvRadio.setAdapter(myAdapter);
      }
}

//************************


public class controller extends Activity
{

	/** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         Context currentContext = this;



         @SuppressWarnings("unused")
		final Data data = new Data(currentContext);

         ArrayAdapter<String> myAdapter;
         ListView lvRadio;


         lvRadio = (ListView)findViewById(R.id.ListViewRadio);
         lvRadio.setClickable(true);
         lvRadio.setOnItemClickListener(new 
AdapterView.OnItemClickListener() {
    			@Override public void onItemClick(AdapterView<?> lv, View view, 
int arg2, long arg3) { BlinkAPI.playNetRadio(arg2);    }});

      }
}

	//This bit of code crashes out when the list adapter is set in 
setRadioTitleAdapterListView(), which is called from another thread

public class Data
{
	static ListView radioLV;
	static public ArrayAdapter<String> radioTitleAdapter;
	private static Context mContext;

	public static ArrayList<String> radioTitleArrayList = new 
ArrayList<String>();



	public Data( Context ctx)
	{
		mContext = ctx;
		
		radioLV = (ListView )((Activity) 
mContext).findViewById(R.id.ListViewRadio);
		radioTitleAdapter = new ArrayAdapter<String>(mContext, 
android.R.layout.simple_expandable_list_item_1,radioTitleArrayList);
	}

	public static void setRadioTitleAdapterListView()
	{
		radioLV.setAdapter(radioTitleAdapter);
		radioTitleAdapter.notifyDataSetChanged();
	}

}
//*******************

I can fill radioTitleArrayList with data.
As far as I can tell the context passed in is the same as in onCreate. 
Ditto lvRadio is the same as radioLV
It's the action of setting the adapter that causes it to fail
Is there anything I am obviously doing wrong?

-- 
Dirk

http://www.neopax.com/technomage/ - My new book - Magick and Technology