Question

我想设置一个日期间隔，当用户按结束日期时，绘制一个图表。我遇到的问题是图表是在开始和结束日期绘制的。

我试图设置一个布尔变量或一个int来决定何时应该绘制图表，但是当我使用“DatePickerFragmet”中的“onDateSet”时，我无法修改其参数...我粘贴了我的代码这里是为了澄清我想解释的内容：

在我的主要活动中，我有：

startDate.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
    // TODO Auto-generated method stub
        for (int i=0; i<2; i++){
            showDatePickerDialog(v,i);
        }
    }
});

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

}

然后在一个新类上我调用onDateSet：

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);
}

public void onDateSet(DatePicker view, int year, int month, int day) {
    // Do something with the date chosen by the user
    LineGraph lineGraph = new LineGraph();
    lineGraph.run(getActivity());

}

...如何在选择最终日期时绘制图表？

Answer 1

根据newFragment.show();

中传递的标记编写if..else或switch语句

在这里，您必须分别为每个日期选择器编写showDatePickerDialog()方法，以便每个日期选择器保留不同的标记。我已经实现了如下：

public void showDeadlineDatePickerDialog(View v) {
    DialogFragment newFragment = new DatePickerFragment();
    newFragment.show(getSupportFragmentManager(), "deadlineDate");
}

public void onDateSet(DatePicker view, int year, int month, int day) {
    StringBuilder task = new StringBuilder();
     task.append(day);
     task.append(".");
     task.append(month+1);
     task.append(".");
     task.append(year);
     String x=task.toString();
     if (getTag()=="deadlineDate")
        {

            btn=(Button) getActivity().findViewById(R.id.btn_deadline_date);
            btn.setText(x);


        }
     if (getTag()=="reminderDate")
     {
         btn=(Button) getActivity().findViewById(R.id.btn_reminder_date);
         btn.setText(x);

     }
}

Answer 2

由于我找不到像前面提到的那样做的方法，我通过使用2个按钮（开始和结束）来选择日期，而不是仅仅使用一个循环来达到解决方案。之后，我创建了另一个类，每个按钮调用一个不同的类。

声明按钮和方法“showStartDatePicker”和“showEndDatePicker”：

final Button startDate = (Button)findViewById(R.id.startDate);
final Button endDate = (Button)findViewById(R.id.endDate);

public void showStartDatePicker(View v) {
    DialogFragment newFragment = new StartDatePickerFragment();
    newFragment.show(getFragmentManager(), "StartDatePicker");
}

public void showEndDatePicker(View v) {
    DialogFragment newFragment = new EndDatePickerFragment();
    newFragment.show(getFragmentManager(), "EndDatePicker");
}

类“StartDatePickerFragment”：

public class StartDatePickerFragment 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);
}

public void onDateSet(DatePicker view, int year, int month, int day) {
    // Do something with the date chosen by the user

    Toast.makeText(getActivity(), "Fecha seleccionada: " + day + "/" + (month+1) + "/" + year, Toast.LENGTH_SHORT).show();
}
}

Class“EndDatePickerFragment”：

public class EndDatePickerFragment 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);
}

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

    LineGraph lineGraph = new LineGraph();
    lineGraph.run(getActivity());
}
}

我差不多两次做同样的事情（创建DatePicker），但我找不到更有效的方法。

多个日期选择器上的问题

2 个答案: