Question

在我的活动中，我有两个TextView（startDatePicker和endDatePicker），当单击它们时，应该显示一个datePicker对话框。到这里为止一切正常，但是在用户选择日期之后，我需要用用户的选择来设置相应单击的textView的文本。我发现了另一条这样的帖子，并从中得到了提示：https://stackoverflow.com/a/24534147/10113273

这是我的DatePickerDialogFragment类：

public class DatePickerDialogFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {

public static final int START_DATE = 0;
public static final int END_DATE = 1;

private int current = 0;
private int chosenDate;

@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    Calendar calendar = Calendar.getInstance();
    int year = calendar.get(Calendar.YEAR);
    int month = calendar.get(Calendar.MONTH);
    int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);

    Bundle bundle = this.getArguments();
    if (bundle != null) {
        chosenDate = bundle.getInt("DATE", 0);
    }
    switch (chosenDate) {
        case START_DATE:
            current = START_DATE;
            return new DatePickerDialog(getActivity(), this, year, month, dayOfMonth);

        case END_DATE:
            current = END_DATE;
            return new DatePickerDialog(getActivity(), this, year, month, dayOfMonth);
    }
    return null;
}

@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
    if (current == START_DATE) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, month);
        calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
        String dateString = DateFormat.getDateInstance().format(calendar.getTime());

        //Set the startDate textView text with the dateString
    } else {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, month);
        calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
        String dateString = DateFormat.getDateInstance().format(calendar.getTime());

        //Set the endDate textView text with the dateString
    }
}

}

在onDateSet内，如何访问textView？我可能认为答案是无法完成的。如果我是对的，该怎么办才能解决这个问题？

在此处在“活动”的textview上设置onClickListener的位置：

startDatePicker.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Bundle bundle = new Bundle();
            bundle.putInt("DATE",0);

            DialogFragment dialogFragment = new DatePickerDialogFragment();
            dialogFragment.setArguments(bundle);
            dialogFragment.show(getSupportFragmentManager(),"date picker");
        }
    });

    endDatePicker.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Bundle bundle = new Bundle();
            bundle.putInt("DATE",1);

            DialogFragment dialogFragment = new DatePickerDialogFragment();
            dialogFragment.setArguments(bundle);
            dialogFragment.show(getSupportFragmentManager(),"date picker");
            //endDatePicker.setText(endDate);
        }
    });

Answer 1

如果不使用DatePickerDialogFragment实现侦听器，可能会更好（我知道它在Android examples中，但是您已经注意到这是一种不灵活的设计）。如果您像这样向setListener添加DatePickerDialogFragment方法：

public class DatePickerDialogFragment extends DialogFragment {

    private DatePickerDialog.OnDateSetListener listener = null;

    void setListener(DatePickerDialog.OnDateSetListener listener) {
        this.listener = listener;
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
        return new DatePickerDialog(getActivity(), listener, year, month, dayOfMonth);
    }
}

然后可以轻松地与不同的日期选择器一起使用，易于在整个应用中重用，并且可以将结果直接放入启动选择器的活动中的其他视图中，例如（下面的示例代码将包含在您的活动中onCreate方法）

final DatePickerDialog.OnDateSetListener startListener = new DatePickerDialog.OnDateSetListener() {
    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear,
                          int dayOfMonth) {

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, month);
        calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
        String dateString = DateFormat.getDateInstance().format(calendar.getTime());

        // set the start date TextView
        startDatePicker.setText(dateString);
    }
};

final DatePickerDialog.OnDateSetListener endListener = new DatePickerDialog.OnDateSetListener() {
    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear,
                          int dayOfMonth) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, month);
        calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
        String dateString = DateFormat.getDateInstance().format(calendar.getTime());

        // set the enddate TextView
        endDatePicker.setText(dateString);
    }
};

// NOTE: Use getSupportFragmentManager or getFragmentManager below
//       depending on which type of DialogFragment you extended

// Reset the listener if the screen was rotated
if (savedInstanceState != null) {
    DatePickerDialogFragment dpf;

    dpf = (DatePickerDialogFragment) getSupportFragmentManager().findFragmentByTag("myStartDatePicker");
    if (dpf != null) {
        dpf.setListener(startListener);
    }

    dpf = (DatePickerDialogFragment) getSupportFragmentManager().findFragmentByTag("myEndDatePicker");
    if (dpf != null) {
        dpf.setListener(endListener);
    }
}

startDatePicker.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        DatePickerDialogFragment dpf = new DatePickerDialogFragment();

        // set bundle args on dpf if still needed

        dpf.setListener(startListener);
        dpf.show(getSupportFragmentManager(), "myStartDatePicker");
    }
});

endDatePicker.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        DatePickerDialogFragment dpf = new DatePickerDialogFragment();

        // set bundle args on dpf if still needed

        dpf.setListener(endListener);
        dpf.show(getSupportFragmentManager(), "myEndDatePicker");
    }
});

同一活动中有两个DatePicker-Android

1 个答案: