java - 如何将日期从 DatePickerDialog 返回到 Mainactivity

Question

我已经成功创建了一个日期选择器类，但现在我希望将日期选择器对话框中的值返回到主 Activity 类。下面是日期选择器对话框的代码。

 public class DateChooser extends DialogFragment implements DatePickerDialog.OnDateSetListener{

    public int y,m,d;

    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        return new DatePickerDialog(getContext(),this,year,month,day);

    }
    @Override
    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
        Toast.makeText(getContext(), "Toast!", Toast.LENGTH_SHORT).show();
        setDay(dayOfMonth);
        setMonth(month);
        setYear(year);


    }

我从 mainactivity 中调用了这个类。

public void dateSelect(View view)
{
DateChooser dateC = new DateChooser();
dateC.show(getSupportFragmentManager(),"tag");
}

Answer 1

这样做:

将其添加到 DateChooser 类:

private DateSelectedListener mListener;

@Override
public void onDateSet(DatePicker view, int year, int month, int day) {
    // Do something with the date chosen by the user
    mListener.onDateSelected(view, year, month, day);
}

public void display(FragmentManager manager, String tag, DateSelectedListener listener) {
    super.show(manager, tag);
    mListener = listener;
}

public interface DateSelectedListener {
    void onDateSelected(DatePicker view, int year, int month, int day);
}

在您的 Activity 中执行以下操作:

public class MyActivity extends AppCompatActivity implements DateChooser.DateSelectedListener {
    //onCreate or whatever other method:
    dateChooser.display(
            getActivity().getSupportFragmentManager(),
            "datePicker", this);
}

祝你好运!!!