如何将数据从BaseAdapter传递到AppCompatDialogFragment？Android

Question

我正在尝试从我的FoodAdapter中传递数据，该数据从BaseAdapter扩展到从AppCompatDialog片段扩展的FoodDialog。当用户单击list_item中的按钮时，我需要将数据传递给FoodDialog。

addToCart = convertView.findViewById(R.id.button);
        View finalConvertView = convertView;
        addToCart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d("TAG", String.valueOf(position));
                TextView s = (TextView) finalConvertView.findViewById(R.id.foodName);
                ConfirmFoodDialog confirmFoodDialog = new ConfirmFoodDialog();

                confirmFoodDialog.show(((CategoryMenu) context).getSupportFragmentManager(), "Title");

                Intent intent = new Intent(finalConvertView.getContext(), ConfirmFoodDialog.class);
                intent.putExtra("Dish", s.getText().toString()); // s.getText().toString() returns the desired value
                
                
            }

确认FoodDialog。班

public Dialog onCreateDialog(Bundle savedInstanceState){
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity(), R.style.MyCustomTheme);
        LayoutInflater inflater = getActivity().getLayoutInflater();

        Intent intent = getActivity().getIntent();
        food = intent.getStringExtra("Dish"); // food is a String variable
        System.out.println(food); // I don't know why food returns null
}

Answer 1

鉴于您正在使用show（FragmentManager）显示对话框，您的对话框似乎是DialogFragment的子类。如果是这种情况，则将信息传递给它的方式与将信息传递给任何片段的方式相同：通过参数束。

Bundle args = new Bundle();
args.putString("Dish", s.getText().toString());

ConfirmFoodDialog confirmFoodDialog = new ConfirmFoodDialog();
confirmFoodDialog.setArguments(args);
confirmFoodDialog.show(((CategoryMenu) context).getSupportFragmentManager(), "Title");

要从片段中读出值，请访问参数并读取您的信息：

public Dialog onCreateDialog(Bundle savedInstanceState){
    // ...

    food = getArguments().getString("Dish");
    System.out.println(food);
}

您可以通过为Dialog片段实现newInstance（）模式来简化第一部分。