android - 在自定义 AlertDialog 中实现 Spinner

Question

我正在尝试在自定义警报对话框中实现微调器，但我一直收到NullPointer 异常。有什么想法吗？

The NullPointer Exception occurs at the line: spinner.setAdapter(adapter); where spinner is null.

LayoutInflater inflater = getLayoutInflater();
        View dialoglayout = inflater.inflate(R.layout.custom_dialog, (ViewGroup) findViewById(R.id.layout_root));
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setView(dialoglayout);

        Spinner spinner = (Spinner) findViewById(R.id.spinner);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.priority_array, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);

        builder.show();

Answer 1

在 dialoglayout 中搜索 Spinner

Spinner spinner = (Spinner) dialoglayout.findViewById(R.id.spinner);