我创建了一个包含以下数据的列表视图：id name date和我创建了一个上下文菜单我的问题是从上下文菜单选项中选择的项目中检索名称。我该怎么做：
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo){
getMenuInflater().inflate(R.menu.context, menu);
}
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()) {
case R.id.item1:
return true;
case R.id.item2:
return true;
default:
return super.onContextItemSelected(item);
}
}
}
我的代码：
public class AllProductsActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://10.0.2.2/webprojecto4/index_pesagem.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "cab_doc";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "descricao";
private static final String TAG_DATA = "dt_ini_camp";
private static final String TAG_DATA2 = "dt_fim_camp";
private static final String TAG_QTD = "qtd";
// products JSONArray
JSONArray products = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_products);
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
registerForContextMenu(lv);
// on seleting single product
// launching Edit Product Screen
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String id2 = ((TextView) view.findViewById(R.id.id)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
Linhas_pesagem.class);
// sending pid to next activity
in.putExtra(TAG_ID, id2);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AllProductsActivity.this);
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
String data = c.getString(TAG_DATA);
String data2 = c.getString(TAG_DATA2);
String qtd = c.getString(TAG_QTD);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_NAME, name);
map.put(TAG_DATA, data);
map.put(TAG_DATA2, data2);
map.put(TAG_QTD, qtd);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
AllProductsActivity.this, productsList,
R.layout.list_item, new String[] { TAG_ID,
TAG_NAME, TAG_DATA, TAG_DATA2, TAG_QTD},
new int[] { R.id.id, R.id.descricao, R.id.data, R.id.data2, R.id.qtd});
// updating listview
setListAdapter(adapter);
}
});
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo){
getMenuInflater().inflate(R.menu.context, menu);
}
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId()) {
case R.id.item1:
return true;
case R.id.item2:
return true;
default:
return super.onContextItemSelected(item);
}
}
}
答案 0 :(得分：0)
info.position是按下以调用上下文菜单的元素集合中的索引。所以YourObject temp = yourCollection.get(info.position);会给你整个对象。
编辑：
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
HashMap <String, String> product = productsList.get(info.position);
String name = product.get(TAG_NAME);
//name contians the name of the product, similarly you can get the others
}