android - 旋转时调用 DatePickerDialog onDateSet

Question

我正在使用 DialogFragment 在 onCreateDialog() 中返回 DatePickerDialog。我已将 dateSetListener 设置为 DialogFragment(在下面的示例中为“this”)并且一切正常，除了在发生屏幕旋转时调用 onDateSet()，这是不希望的。如何让 onDateSet 在屏幕旋转时不被调用？

我的 DialogFragment

public static class DateDialogFragment extends DialogFragment implements
DatePickerDialog.OnDateSetListener{

    public static DateDialogFragment newInstance() {
        return new DateDialogFragment();
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new DatePickerDialog(getActivity(), this, 2012, 11, 19);
    }

    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear,
        int dayOfMonth) {
        //This is called when screen rotated, which I dont want
        Toast.makeText(getActivity(), "Year: "+year+" Month: "+monthOfYear+" Day: "+dayOfMonth, Toast.LENGTH_SHORT).show();
    }

}

我就是这样调用它的

if(getActivity()!=null){
    FragmentManager fm = getActivity().getSupportFragmentManager();
    DialogFragment newFragment = DateDialogFragment.newInstance();
    newFragment.show(fm, "dialog");
}

Answer 1

在onDateSet 方法中，使用Activity::isChangingConfigurations 检查Activity 是否因配置更改而重新启动。 .如果是，则不显示 Toast。

@Override
public void onDateSet(android.widget.DatePicker view, int year, int monthOfYear, int dayOfMonth) {
    if( ! this.getActivity().isChangingConfigurations() ) {
        // Dialog is dismissed by user explicitly, hence show the Toast message.       
        Toast.makeText(getActivity(), "Year: "+year+" Month: "+monthOfYear+" Day: "+dayOfMonth, Toast.LENGTH_SHORT).show();
    }
}

我已经对其进行了测试并且运行良好。如果需要任何进一步的帮助，请告诉我。