java - 请帮助我在 AlertDialog 中设置上下文菜单

Question

我一整天都在做这件事，我已经很接近了，但就是无法让它发挥作用。我有一个按钮可以拉出一个 AlertDialog，其中填充了已保存的条目，其中包括名称和价格。现在，我可以单击对话框中的某个项目，并让它自动填写我的 Activity 中的名称和价格字段。我还希望能够长按一个项目并收到删除它的选项。这是我第一次尝试 Android 应用程序，其中很多内容都是从记事本教程中重新调整的。有两件事我不明白:

1)我的registerForContextMenu足够/正确吗？

2)我的 onCreateContextMenu 做错了什么？

谢谢。

savedItems.setOnClickListener(new View.OnClickListener() {
     public void onClick(View v) {

      cDbHelper.open();
      mNotesCursor = cDbHelper.fetchAllSaved();
            startManagingCursor(mNotesCursor);

            // Create an array of names and corresponding prices from db
            String[] from = new String[]{SavedItemsDbAdapter.KEY_NAME, SavedItemsDbAdapter.KEY_PRICE};

            // and an array of the fields we want to bind those fields to
            int[] to = new int[]{R.id.text1, R.id.text2};

            // Now create a simple cursor adapter and set it to display
            SimpleCursorAdapter saved = 
                 new SimpleCursorAdapter(NewEntry.this, R.layout.saved_row, mNotesCursor, from, to);

      // Build an AlertDialog to hold this list
            AlertDialog.Builder builder = new AlertDialog.Builder(NewEntry.this);
      builder.setTitle("Choose from list");
      // IS THIS SUFFICIENT TO REGISTER FOR CONTEXT MENU?
      registerForContextMenu(v);
      builder.setAdapter(saved, new DialogInterface.OnClickListener() {

       // When an item from the list is clicked, it automatically populates the name and price fields in activity
       @Override
       public void onClick(DialogInterface dialog, int item) {
 Cursor c = mNotesCursor;
       c.moveToPosition(item);
 Intent i = new Intent(NewEntry.this, NewEntry.class);
       i.putExtra("name", c.getString( 
         c.getColumnIndexOrThrow(SavedItemsDbAdapter.KEY_NAME)));
       i.putExtra("price", c.getString(
         c.getColumnIndexOrThrow(SavedItemsDbAdapter.KEY_PRICE)));
       startActivityForResult(i, ACTIVITY_AUTO);
       finish();
}

      // TRYING AND FAILING TO SET UP A CONTEXT MENU - the goal is to be able to long press, 
      // have a "Delete?" option pop up, which will delete the entry when clicked 
      @Override
      public void onCreateContextMenu(ContextMenu menu, View v,
    ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    menu.add(0, DELETE_ID, 0, R.string.menu_delete);
   }

   public boolean onContextItemSelected(MenuItem item) {

    switch(item.getItemId()) {
       case DELETE_ID:
        AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
        mDbHelper.deleteItem(info.id);
        return true;
    }
    return false;
   }
      });

      AlertDialog alert = builder.create();

         alert.show();

        }

     });

    }

Answer 1

我刚刚发现

@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {

被召唤，但没有

@Override
public boolean onContextItemSelected(MenuItem item) {

在我的子类 AlertDialog 中:

public class MyAlertDialog extends AlertDialog implements
OnCreateContextMenuListener {

也许这对其他人有用，因为我很确定您已经解决了手头的问题。