I'm having trouble with number picker. When i try to add min and max values in java code for the numberpicker i get this error

> 
> Attempt to invoke virtual method 'void android.widget.NumberPicker.setMinValue(int)' on a null object reference 
> 
> 
> 

Obviously, it doesn't recognize my numberpicker, so that i can not add the values.

Somebody found a solution to this problem [here](https://stackoverflow.com/questions/12317960/android-numberpicker-set-min-max-default-from-xml/14174312#14174312), but it doesn't really fit me. Because in the next dialog i'll need another numberpicker and adjust it according to the previous one.

```
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState){
        AlertDialog.Builder bodyBuilder = new AlertDialog.Builder(getActivity());
        LayoutInflater inflator = getActivity().getLayoutInflater();
        bodyBuilder.setTitle(R.string.title);
        NumberPicker np = (NumberPicker) getActivity().findViewById(R.id.nambir);
        np.setMinValue(1);
        np.setMaxValue(100);
        final int npValue= np.getValue();
        bodyBuilder.setView(inflator.inflate(R.layout.layout_diyalog, null))
                .setPositiveButton("Continue", new DialogInterface.OnClickListener(){
                    @Override
                            public void onClick(DialogInterface dialog, int id){
                        Intent intent = new Intent(getActivity(), Olurmuki.class);
                        intent.putExtra("value", npValue);
                        startActivity(intent);
                    }
                })
                .setNegativeButton("Cancel",new DialogInterface.OnClickListener(){
                    @Override
                    public void onClick(DialogInterface dialog, int id){
                        MyDialog.this.getDialog().cancel();
                    }
                });
        return bodyBuilder.create();
}

```