有人可以给我一个删除列表视图中选定项目的示例代码吗？我正在使用简单的适配器来存储数据。我的代码是..
static final String KEY_ITEM = "finance"; // parent node
static final String KEY_ID = "finance";
static final String KEY_NAME = "company";
static final String KEY_COST = "high";
static final String KEY_DESC = "volume";
static final String KEY_SYMBOL="symbol";
static final String KEY = "low";
private String selectedItem;
private ListAdapter adapter;
Context context;
ListView lv;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView titleBar = (TextView)getWindow().findViewById(android.R.id.title);
titleBar.setTextColor(Color.GREEN);
final ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_ITEM);
for (int i = 0; i < nl.getLength(); i++) {
// HashMap<String, String> map = new HashMap<String, String>();
Node theAttribute;
Element e = (Element) nl.item(i);
NodeList nl1=e.getElementsByTagName(KEY_ID);
System.out.println("keyId"+nl1.getLength());
for(int j=0;j<nl1.getLength();j++)
{
Element e1 = (Element) nl1.item(j);
HashMap<String, String> map = new HashMap<String, String>();
NodeList n = e1.getElementsByTagName(KEY_NAME);
for (int k = 0; k < n.getLength(); k++) {
Element e2 = (Element) n.item(k);
// System.out.println("node Title value"+e2.getNodeName());
NamedNodeMap attributes2 = e2.getAttributes();
// System.out.println("attrlength"+attributes2.getLength());
for (int a = 0; a < attributes2.getLength(); a++)
{
theAttribute = attributes2.item(a);
String s=theAttribute.getNodeValue();
// lblName.setTypeface(hindiFont);
//s = s.replaceAll("[-;#39&:,]","");
map.put(KEY_NAME,s);
}
}
NodeList n4 = e1.getElementsByTagName(KEY_SYMBOL);
// System.out.println("title "+n.getLength());
for (int k = 0; k < n4.getLength(); k++) {
Element e2 = (Element) n4.item(k);
// System.out.println("node snippet value"+e2.getNodeName());
NamedNodeMap attributes2 = e2.getAttributes();
for (int a = 0; a < attributes2.getLength(); a++)
{
// HashMap<String, String> map = new HashMap<String, String>();
theAttribute = attributes2.item(a);
String s=theAttribute.getNodeValue();
map.put(KEY_SYMBOL,s);
// menuItems.add(map);
}
}
NodeList n1 = e1.getElementsByTagName(KEY_COST);
// System.out.println("title "+n.getLength());
for (int k = 0; k < n1.getLength(); k++) {
Element e2 = (Element) n1.item(k);
// System.out.println("node Url value");
NamedNodeMap attributes2 = e2.getAttributes();
// System.out.println("attrlength"+attributes2.getLength());
for (int a = 0; a < attributes2.getLength(); a++)
{
//HashMap<String, String> map = new HashMap<String, String>();
theAttribute = attributes2.item(a);
map.put(KEY_COST,theAttribute.getNodeValue());
}}
NodeList n2 = e1.getElementsByTagName(KEY_DESC);
// System.out.println("title "+n.getLength());
for (int k = 0; k < n2.getLength(); k++) {
Element e2 = (Element) n2.item(k);
// System.out.println("node snippet value"+e2.getNodeName());
NamedNodeMap attributes2 = e2.getAttributes();
for (int a = 0; a < attributes2.getLength(); a++)
{
// HashMap<String, String> map = new HashMap<String, String>();
theAttribute = attributes2.item(a);
String s=theAttribute.getNodeValue();
map.put(KEY_DESC,s);
// menuItems.add(map);
}
} NodeList n3 = e1.getElementsByTagName(KEY);
// System.out.println("title "+n.getLength());
for (int k = 0; k < n3.getLength(); k++) {
Element e2 = (Element) n3.item(k);
// System.out.println("node snippet value"+e2.getNodeName());
NamedNodeMap attributes2 = e2.getAttributes();
for (int a = 0; a < attributes2.getLength(); a++)
{
// HashMap<String, String> map = new HashMap<String, String>();
theAttribute = attributes2.item(a);
String s=theAttribute.getNodeValue();
map.put(KEY,s);
// menuItems.add(map);
}
}
menuItems.add(map);
}
}
// Adding menuItems to ListView
adapter = new SimpleAdapter(this, menuItems,
R.layout.list_item,
new String[] { KEY_NAME, KEY_DESC, KEY_COST,KEY,KEY_SYMBOL }, new int[] {
R.id.name, R.id.desciption, R.id.cost,R.id.low,R.id.symbol }){
};
setListAdapter(adapter);
// selecting single ListView item
lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
/* String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString();
String description = ((TextView) view.findViewById(R.id.desciption)).getText().toString();
*/
// Starting new intent
/*Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(KEY_NAME, name);
in.putExtra(KEY_COST, cost);
in.putExtra(KEY_DESC, description);
startActivity(in);*/
Toast.makeText(getApplicationContext(), "on clicked",Toast.LENGTH_LONG).show();
}
});
// Create the listener for long item clicks
OnItemLongClickListener itemLongListener = new OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> parent, View v, final int position, long rowid) {
final View view=v;
// Store selected item in global variable
selectedItem = parent.getItemAtPosition(position).toString();
// Toast.makeText(getApplicationContext(), "select item"+selectedItem,Toast.LENGTH_LONG).show();
AlertDialog.Builder builder = new AlertDialog.Builder(AndroidXMLParsingActivity.this);
builder.setMessage("Do you want to remove " + "?");
final int positionToRemove = position;
builder.setCancelable(false);
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
adapter.remove(selectedItem);
adapter.notifyDataSetChanged();
Toast.makeText(
getApplicationContext(),
selectedItem + " has been removed.",
Toast.LENGTH_SHORT).show();
dialog.cancel();
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Create and show the dialog
builder.show();
// Signal OK to avoid further processing of the long click
return true;
}
};
getListView().setOnItemLongClickListener(itemLongListener);
}
}
它显示了这些行中的错误
adapter.remove(selectedItem);
adapter.notifyDataSetChanged();
它显示 ListAdapter 添加到强制转换适配器的类型未定义方法 remove(String)
请帮我提供示例代码！！！！提前致谢！！！！！！！！