Question

我创建了一个sprites.clear(screen,clear_callback) sprites.update() sprites.draw(screen)，我从DateandTimePickerDialogueFragment拨打了DateandTimePickerDialogueFragment。

我的问题是，如何将MainActivity结果值发送到DateandTimePickerDialogueFragment。

MainActivity：

MainActivity

DateandTimePickerDialogueFragment：

@Override
public void onClick(View v) {

    if (v.getId() == R.id.buttonid) {

        DateandTimePickerDialogueFragment dateandTimePickerDialogueFragment = new DateandTimePickerDialogueFragment();
        dateandTimePickerDialogueFragment.show(getSupportFragmentManager(), "DateandTimePickerDialogueFragment");
    }
}

Answer 1

在DialogFragment中，您可以为此设置界面

用以下代码替换完整代码

public class DateandTimePickerDialogueFragment extends DialogFragment {
public static interface OnCompleteListener {
    public abstract void onComplete(String time);
}

private OnCompleteListener mListener;
// make sure the Activity implemented it

public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        this.mListener = (OnCompleteListener) activity;
    } catch (final ClassCastException e) {
        throw new ClassCastException(activity.toString() + " must implement OnCompleteListener");
    }
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return super.onCreateView(inflater, container, savedInstanceState);
}

@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    return displayDateDialogPicker(getActivity());
}

/**
 * @param context
 */
private Dialog displayDateDialogPicker(Context context) {
    mListener = (OnCompleteListener)getActivity();
    int mYear, mMonth, mDay;
    final Calendar c = Calendar.getInstance();
    mYear = c.get(Calendar.YEAR);
    mMonth = c.get(Calendar.MONTH);
    mDay = c.get(Calendar.DAY_OF_MONTH);

    DatePickerDialog dpd = new DatePickerDialog(context,
            new DatePickerDialog.OnDateSetListener() {

                @Override
                public void onDateSet(DatePicker view, int year,
                                      int monthOfYear, int dayOfMonth) {
                    int mymonth = monthOfYear + 1;
                    String mmmMonth = "", mmDate = "";
                    if (mymonth > 0 && mymonth < 10) {

                        mmmMonth = "0" + mymonth;

                    } else {

                        mmmMonth = "" + mymonth;
                    }

                    if (dayOfMonth > 0 && dayOfMonth < 10) {
                        mmDate = "0" + dayOfMonth;
                    } else {

                        mmDate = "" + dayOfMonth;
                    }
                    //YYYY-MM-DD
                    String finalDate = year + "-" + (mmmMonth) + "-" + mmDate;


                    mListener.onComplete(finalDate);
                   // getTargetFragment().onActivityResult(getTargetRequestCode(), Activity.RESULT_OK, intentData);
                }
            }, mYear, mMonth, mDay);
    dpd.show();
    return dpd;
}
}

现在，在您的活动中，您可以implements DateandTimePickerDialogueFragment.OnCompleteListener并导入界面的方法，在此方法中您可以获取数据

 @Override
public void onComplete(String time) {
    Log.d("TAG", time.toString());
}

Answer 2

虽然在DialogFragment上并且在返回dpd之前没有使用包含方法或valueType的接口，但是在该变量接口中插入该dpd并在MainActivity上实现该接口。

Answer 3

您需要设置一个接口侦听器。

在对话框片段中：

    public interface DateandTimeListener {
         public void OnDateTimeSelected(String date);
    }

    private static DateandTimeListener mListener;

    //Your activity will call this. Passing its context 'this' as the listener.
    public void setDateandTimeListener(DateandTimeListener listener){
         mListener = listener;
    }

然后在你的onDateSet：

 public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth){
 ....                        
 String finalDate = year + "-" + (mmmMonth) + "-" + mmDate;
 mListener.OnDateTimeSelected(finalDate);

 ....
 }

在您的MainActivity中：

确保您实现了侦听器。

 public class MainActivity extends Activity implements DateandTimePickerDialogueFragment.DateandTimeListener

这将强制您覆盖活动中的OnDateTimeSelected回调函数。从那里，您将获得从对话框返回的finalDate字符串。

同样在您的活动中，请务必致电setDateandTimeListener(this)设置听众

希望有所帮助！

如何返回Dialogue片段结果值

3 个答案: