Question

我有两个ImageButtons。一个负责设置开始日期，另一个负责设置结束日期。按下每个按钮时，它们会显示一个DatePickerDialog。 onCreateDialog方法在另一个类中。这是班级：

DatePickerFragment.Java

package com.ThatOneNoob.smarthaul;

import java.util.Calendar;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.os.Bundle;
import android.widget.DatePicker;


public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {

@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);


    // Create a new instance of DatePickerDialog and return it
    return new DatePickerDialog(getActivity(), this, year, month, day);
}


@Override
public void onDateSet(DatePicker v, int year, int month, int day) {
    // TODO Auto-generated method stub

    switch (v.getId()){

    case R.id.datesel1:
        toDate.setText(new StringBuffer());
    }
 }


}

显然不完整，toDate是它想要管理的TextView之一。 datesel1是ImageButton。它将附加TextView以包含01/02/2013格式的设置日期。我不能将TextView声明为静态，因此我无法在此类中调用它。那么，我应该让onDateSet调用一个静态方法来将TextView设置为它需要做什么吗？或者我该怎么办？

Answer 1

在单独的类中创建对话框并为侦听器创建一个getter：

public class DatePickerFragment extends DialogFragment
{
    private OnDateSetListener onDateSetListener;

    public DatePickerFragment() {}

    public void setOnDateSetListener(OnDateSetListener onDateSetListener) {
        this.onDateSetListener = onDateSetListener;
    }

    @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);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), onDateSetListener, year, month, day);
    }

}

DatePickerDialog.OnDateSetListener的实现在您引用TextView的其他片段的活动中生成。
然后创建一个日历并使用SimpleDateFormat，查看example：

public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        Calendar cal = Calendar.getInstance();
        cal.set(year, monthOfYear, dayOfMonth);
    <=== YOUR SETTEXT TO YOUR TEXTVIEW HERE ===>
}

如何在Java中使用另一个类的onDateSet？

1 个答案: