Question

您好我是Android和Java的新手，我正在编写一个Date Picker Fragment类，它扩展DialogFragment并实现DatePickerDialog.OnDateSetListener，因为我必须声明方法public void onDateSet(DatePicker view, int year, int month, int day)，我在public String变量中设置了我的新约会。

我可以在主活动中使用此public String变量来显示TextView中的值吗？如果是，如何？

我的主要活动代码是：

public class TARForm extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {

    EditText departuredate;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tarform);
        departuredate = (EditText) findViewById(R.id.departure_date);
    }

    public void showDatePickerDialog(View v) {
        DialogFragment newFragment = new DatePickerFragment();
        newFragment.show(getFragmentManager(), "datePicker");
    }
}

DatePickerFragment 代码为：

public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener{

    int selectyear, selectmonth, selectday;
    public String date;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        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(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {

        selectday = day;
        selectmonth = month+1;
        selectyear = year;
        date = selectday + "-" + selectmonth + "-" + selectyear;
    }
}

如果您可以引导这些信息，我如何才能获得MainActivity离职人员的“约会”？感谢。

Answer 1

    //In your actiivty
String date=null;

public void setDate(String date){
    this.date=date;
    //set this date in your text View
}


   //In your fragment

Context context;
@Override
public void onAttach(Context context){
    this.context=context;
}

public void onDateSet(DatePicker view, int year, int month, int day){
    String date=//get Date over here
    ((TARForm)context).setDate(date)
}

Answer 2

您可以在 onDateSet（）方法

中的片段中尝试以下代码

public void onDateSet(DatePicker view, int year, int month, int day) {

        selectday = day;
        selectmonth = month+1;
        selectyear = year;
        date = selectday + "-" + selectmonth + "-" + selectyear;

        if(getActivity() instanceOf TARForm){
           ((TARForm)getActivity()).departuredate.setText(date);
        }
    }

如果您的活动和片段位于不同的文件夹中，

并在您的 TARForm 活动中生成public EditText departuredate;

从声明为public void的方法中检索值

2 个答案: