在列表视图上的长按事件后创建菜单

Question

我有一个连接到数据库的列表视图,显示所有条目.如果用户长按listview(数据库条目)中的项目,我想要显示一个菜单,显示编辑或删除条目的选项.我怎样才能做到这一点.

直到现在,我已经尝试使用onItemLongClick监听器和吐司,显示长按的视图的ID.

@Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
        int position, long id) {

    String res = Long.toString(id);
     Toast toast = Toast.makeText(this, res, Toast.LENGTH_SHORT);
     toast.show();

    return true;
}

Answer 1

首先,您需要在列表视图中注册上下文菜单.

lv = (ListView) findViewById(R.id.list_view);
registerForContextMenu(lv);

然后,只需覆盖活动方法.

/**
 * MENU
 */

@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);
      }
}

以下是menu_list.xml文件的示例(您必须将文件放在res/menu文件夹中).

<?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>

希望它会有所帮助.

Answer 2

而不是使用onItemLongClick你可以使用

public void onCreateContextMenu(final ContextMenu menu, 
                    final View v, final ContextMenuInfo menuInfo) {
 ...
}

您可以在其中设置编辑和删除选项或任何您需要的选项.

可以处理从上下文菜单中选择的项目的操作

public boolean onContextItemSelected(final MenuItem item)

对于上下文菜单更多信息,请点击这里.

有关分步教程,请访问此处.

Answer 3

另一种方法:

//Deleted individual cart items
    //on list view cell long press
    cartItemList.setOnItemLongClickListener (new OnItemLongClickListener() {
          @SuppressWarnings("rawtypes")
        public boolean onItemLongClick(AdapterView parent, View view, final int position, long id) {
              final CharSequence[] items = { "Delete" };

                AlertDialog.Builder builder = new AlertDialog.Builder(context);

                builder.setTitle("Action:");
                builder.setItems(items, new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int item) {
                        cart = cartList.get(position);
                        db.removeProductFromCart(context, cart);

                        new AlertDialog.Builder(context)
                        .setTitle(getString(R.string.success))
                        .setMessage(getString(R.string.item_removed))
                        .setPositiveButton("Done", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) { 
                                Intent intent = new Intent(CartDetailsActivity.this, HomeScreen.class);
                                startActivity(intent);
                            }
                         })
                         .show();

                    }

                });

                AlertDialog alert = builder.create();

                alert.show();
            //do your stuff here
              return false;
          }
        });