如何在显示类似于上下文菜单的选项的列表视图上创建长单击事件

Question

在此

脚本中的列表视图上长按事件后，如何创建上下文菜单？

我需要添加一个OnLongClickListener并显示上下文类型菜单，作为长按 listView 中的一个项目的结果。

 public class MainActivity extends ListActivity {
   ArrayList<HashMap<String, String>> contactList;
   @Override
   public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
     contactList = new ArrayList<>();
     ListView lv = getListView();
     // Listview on item click listener
     lv.setOnItemClickListener(new OnItemClickListener() {
         public void onItemClick(AdapterView<?> parent, View view,
                                 int position, long id) {
             // getting values from selected ListItem
             String nomer = ((TextView) view.findViewById(R.id.nomer))
                     .getText().toString();
             Intent callIntent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + nomer));
             if (ActivityCompat.checkSelfPermission(MainActivity.this,
 Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                 return;
             }
             startActivity(callIntent);
         }
     });
 }
 class GetContacts extends AsyncTask<Void, Void, Void> {
     @Override
     protected void onPreExecute() {
         super.onPreExecute();
         // Showing progress dialog
         pDialog = new ProgressDialog(MainActivity.this);
         pDialog.setMessage("Please wait...");
         pDialog.setCancelable(false);
         pDialog.show();
     }
     @Override
     protected Void doInBackground(Void... arg0) {
         // Creating service handler class instance
         ServiceHandler sh = new ServiceHandler();
         // Making a request to url and getting response
         String jsonStr = sh.makeServiceCall(url.get(), ServiceHandler.GET);
         Log.d("Response: ", "> " + jsonStr);
         if (jsonStr != null) {
             try {
                 JSONObject jsonObj = new JSONObject(jsonStr);
                 // Getting JSON Array node
                 contacts = jsonObj.getJSONArray(TAG_CONTACTS);
                 // looping through All Contacts
                 for (int i = 0; i < contacts.length(); i++) {
                     JSONObject c = contacts.getJSONObject(i);
                     String id = c.getString(TAG_ID);
                     String name = c.getString(TAG_NAME);
                     String nomer = c.getString(TAG_NOMER);
                     String date = c.getString(TAG_DATE);
                     String url = c.getString(TAG_URL);
                     // tmp hashmap for single contact
                     HashMap<String, String> contact = new HashMap<>();
                     // adding each child node to HashMap key => value
                     contact.put(TAG_NAME, name);
                     contact.put(TAG_NOMER, nomer);
                     contact.put(TAG_URL, url);
                     contact.put(TAG_DATE, date);
                     // adding contact to contact list
                     contactList.add(contact);
                 }
             } catch (JSONException e) {
                 e.printStackTrace();
             }
         } else {
             Log.e("ServiceHandler", "Couldn't get any data from the url");
         }
         return null;
     }
     @Override
     protected void onPostExecute(Void result) {
         super.onPostExecute(result);
         // Dismiss the progress dialog
         if (pDialog.isShowing())
             pDialog.dismiss();
         /**
          * Updating parsed JSON data into ListView
          * */
         ListAdapter adapter = new SimpleAdapter(
                 MainActivity.this, contactList,
                 R.layout.list_item, new String[]{TAG_NAME, TAG_NOMER, TAG_DATE,
                 TAG_URL}, new int[]{R.id.name, R.id.nomer,
                 R.id.date });
         setListAdapter(adapter);
     }
}

Answer 1

在列表视图中注册上下文菜单：

registerForContextMenu(lv);

添加覆盖方法：

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
      super.onCreateContextMenu(menu, v, menuInfo);
      if (v.getId()==R.id.list_view) {
          MenuInflater inflater = getMenuInflater();
          inflater.inflate(R.menu.menu_list, menu);
      }
}
@Override
public boolean onContextItemSelected(MenuItem item) {
      AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
      switch(item.getItemId()) {
         case R.id.add:
         // add stuff here
            return true;
          case R.id.edit:
            // edit stuff here
                return true;
          case R.id.delete:
        // remove stuff here
                return true;
          default:
                return super.onContextItemSelected(item);
      }
}

最后，添加如下菜单文件（根据您的要求自定义）

<?xml version="1.0" encoding="utf-8"?>
<menu
  xmlns:android="http://schemas.android.com/apk/res/android">
       <item android:id="@+id/add"
              android:icon="@android:drawable/ic_menu_add"
              android:title="@string/menu_add" />
      <item android:id="@+id/edit"
              android:icon="@android:drawable/ic_menu_edit"
              android:title="@string/menu_edit" />
       <item android:id="@+id/delete"
            android:icon="@android:drawable/my_icon_delete"
             android:title="@string/menu_delete" />
</menu>

在 res/菜单文件夹中