Question

我正在学习使用Pickers而我无法将View传递给DatePickerFragment。这是一个示例完整项目源文件的github链接：https://github.com/MienTommy/DatePickerFragment

这是实现DatePickerFragment

的源代码

package com.mienapps.datepickerfragment;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.DatePicker;
import android.widget.TextView;

import java.util.Calendar;
import java.util.List;

public class CustomAdapter extends ArrayAdapter<TextView>
{
    Activity mContext;
    public CustomAdapter(Activity context, List<TextView> views)
    {
        super(context, 0, views);
        mContext = context;
    }

    /*Get view from adapter*/
    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        View itemView = convertView;
        if (convertView == null)
        {
            itemView = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
        }

        TextView datePickerView = (TextView) itemView.findViewById(R.id.date_picker);

        datePickerView.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View view)
            {
                DialogFragment newFragment = new DatePickerFragment();
                newFragment.show(mContext.getFragmentManager(), "datePicker");
            }
        });

        return itemView;
    }

    /*Time Picker*/
    public static 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) {
            //TODO: set itemView to the date that is picked. However I can't access it from here.
        }
    }
}

在TODO部分，我想访问itemView，这样我就可以将文本设置为用户选择的日期。我不能使用findViewById来引用TextView，因为我的TextView是ListView的一部分。

Answer 1

您可以在DatePickerFragment上添加一个接口并在您的适配器类中实现该接口，每当DatePickerFragment更新日期时，您都可以调用该接口。在适配器类中，您可以覆盖接口以执行任何操作。如果您是接口新手，可以在此处查看示例http://www.tutorialspoint.com/java/java_interfaces.htm
您可以将DatePickerFragment中的更新值存储在数据库中，在显示列表时，您可以从数据库中读取值。

如何在DatePickerFragment中传递视图？使用ListView和ArrayAdapter

1 个答案: