Android - AlertDialog within onContextItemSelected does not work

I have a following pseudo-code.

public boolean onContextItemSelected(MenuItem aItem) {
      switch(aItem.getItemId()) {
           case A: {
                new AlertDialog.Builder(this)
                  .setIcon(android.R.drawable.ic_dialog_alert)
                  .setTitle("Delete")
                  .setMessage("Delete?")
        开发者_开发技巧          .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int which) {
                             // do stuff A...
                       }
                  });

                  // do stuff B...

                  return true;
           }
      }
  }

The problem is that it never shows the alert dialog. However, it does things as stated in "do stuff B..."

Does anyone know why AlertDialog is now showing?

Thank you!

---

you need to .create() .show() will solve the problem :)

AlertDialog dialog = new AlertDialog.Builder(this)
              .setIcon(android.R.drawable.ic_dialog_alert)
              .setTitle("Delete")
              .setMessage("Delete?")
              .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                   @Override
                   public void onClick(DialogInterface dialog, int which) {
                         dialog.dismiss();
                   }
              }).create();
dialog.show();

And when you don't need it anymore you can dismiss() it.

Edit: sorry. forgot .create() :)