在NumberPicker上显示AlertDialog

Question

我试图在一个NumberPicker上显示一个AlertDialog。

AlertDialog可以工作，但它没有显示NumberPicker。

这是我的密码

public Dialog onCreateDialog(Bundle savedInstanceState){
    final NumberPicker numberPicker = new NumberPicker(getActivity());
    numberPicker.setMaxValue(360);
    numberPicker.setMinValue(0);


    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle("Changing the Hue");
    builder.setMessage("Choose a value :");
    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialogHost.onPositiveButton(numberPicker.getValue());
        }
    });
    builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener(){

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialogHost.onCancelButton();
        }
    });
    return builder.create();
}

Answer 1

您从未设置对话框的视图。

builder.setView(numberPicker);

Answer 2

你需要包括两行：

1. builder.setView(numberPicker);
2. return build.show()

所以，代码必须是这样的：

public Dialog onCreateDialog(Bundle savedInstanceState)
{
    final NumberPicker numberPicker = new NumberPicker(getActivity());
    numberPicker.setMaxValue(360);
    numberPicker.setMinValue(0);


    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setView(numberPicker);    
    builder.setTitle("Changing the Hue");
    builder.setMessage("Choose a value :");
    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) 
    {
        dialogHost.onPositiveButton(numberPicker.getValue());
    }
    });
    builder.setNegativeButton("CANCEL", new DialogInterface.OnClickListener()
{
    @Override
    public void onClick(DialogInterface dialog, int which) 
    {
        dialogHost.onCancelButton();
    }
    });
   builder.create();
   return builder.show();
}