A dynamic list of items with SimpleAdapter

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/***
* DynamicListItems.java
*
public class DynamicListItems extends ListActivity {
	private static final String			ITEM_KEY	= "key";
	ArrayList<HashMap<String, String>>	list		= new ArrayList<HashMap<String, String>>();
	private SimpleAdapter				adapter;
	private EditText					newValue;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.dynamic_list);
		newValue = (EditText) findViewById(R.id.new_value_field);

		this.adapter = new SimpleAdapter(this, list, R.layout.row, new String[] { ITEM_KEY }, new int[] { R.id.list_value })
		setListAdapter(this.adapter);

		((ImageButton) findViewById(R.id.button)).setOnClickListener(getBtnClickListener());
	}

	private OnClickListener getBtnClickListener() {
		return new OnClickListener() {
			public void onClick(View view) {
				try {
					HashMap<String, String> item = new HashMap<String, String>();
					item.put(ITEM_KEY, newValue.getText().toString());
					list.add(item);
					adapter.notifyDataSetChanged();
				} catch (NullPointerException e) {
					Log.i("[Dynamic Items]", "Tried to add null value");
				}
			}
		};
	}
}


/***
* res/layout/dynamic_list.xml
*
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
     
    
	 <ListView android:id="@+id/android:list"
	    android:layout_width="fill_parent"
	    android:layout_height="0px"
	    android:layout_weight="1"
	    android:cacheColorHint="#00000000">
	 </ListView>
  
  
	<LinearLayout
		android:orientation="horizontal"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_marginTop="6px"
		android:layout_marginBottom="8px"
		android:layout_marginLeft="8px"
		android:layout_marginRight="8px"
		android:background="#00000000">
	    
	    
	   	<ImageButton
	   	android:id="@+id/button" 
	    	android:layout_width="100px"
	    	android:layout_height="100px"
	    	android:src="@android:drawable/ic_menu_add"  />	
	</LinearLayout>    	
     
	<LinearLayout
		android:orientation="vertical"
		android:layout_width="230px"
		android:layout_height="wrap_content"
	 	android:layout_marginTop="8px"
	 	android:layout_marginBottom="8px"
	 	android:layout_marginLeft="0px"
	 	android:layout_marginRight="28px"
	 	android:background="#cccccc00" >
	
		<EditText android:id="@+id/new_value_field"
			android:textColor="#020905"
			android:textSize="18sp"
	      	android:layout_marginTop="6px"
	      	android:layout_marginBottom="8px"
	       	android:layout_marginLeft="12px"
	       	android:layout_marginRight="12px"
	       	android:layout_width="210px"
	       	android:layout_height="wrap_content"
	       	android:layout_weight="1"/>
	
	</LinearLayout> 
</LinearLayout>


/***
* res/layout/row.xml
*

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#00000000">
    
    <TextView 
    	android:id="@+id/list_value" 
    	android:layout_width="fill_parent"
    	android:layout_height="wrap_content"
    />
</LinearLayout>