Dynamically add lsitView code instances in Android Development

This is easy to understand. Do not forget adapter. notifyDataSetChanged ();

Wake up. In fact, this wake-up function is used under the button or called under another control. If it is called under getView, it is no longer necessary.

Java code:

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 );

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

(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 ");

}

}

};

}

}

Java code:

<? 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>

ROw:

<? 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>