Question

应用程序应该有两个按钮和一个TextView，一个用于日期，另一个用于时间。单击日期按钮将在TextView中显示当前日期，并为时间按钮提供相同的日期。 updateTime类是我遇到问题的地方。我尝试过将该日期传递给ID的不同方法。

这是我的源代码和说明：

package com.CS211D.DateAndTime;

import android.app.Activity;
import android.os.Bundle;
import android.text.format.Time;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import java.util.Date; 
import java.util.Calendar;
import java.text.DateFormat;
/*
 * This is the activity for my Android App that gives you the date and time when you click on a button. I'm having trouble trying to figure out the date syntax 
 */
//*******************TimeAndDateActivity*******************
public class TimeAndDateActivity extends Activity implements View.OnClickListener
{
    Button btn;
    DateFormat fmtDateTime = DateFormat.getDateAndTimeInstance(); //other utils I've tried
    Calendar mycal = Calendar.getInstance();                      //with no avail
    @Override
    //*******************onCreate*******************
    public void onCreate(Bundle b)
    {
        super.onCreate(b);
        btn = (Button)this.findViewById(R.id.time);   //Time Button
        btn = (Button)this.findViewById(R.id.day);    //Date Button

    }
        //*******************onClick*******************
        public void onClick(View v) //Called when one of the buttons above is clicked is clicked
        {
             updateTime();
        }
            //*******************updateTime*******************
            private void updateTime()
            {
                t = getTime()
                btn.setText(getDate().toString(R.id.time));//Most of the methods I try eclipse says 
                                                           //the method is either undefined or incompatible
                                                           //with the object
            }


}

Answer 1

试试这段代码 -

Calendar c = Calendar.getInstance();
int day = c.get(Calendar.DAY_OF_MONTH);
int month = c.get(Calendar.MONTH);
int year = c.get(Calendar.YEAR);
String date = String.valueOf(day) + "-" + String.valueOf(month) + "-" +String.valueOf(year);
btn = (Button)this.findViewById(R.id.day); 
btn.setText(date);

试试这段代码。

Answer 2

为每个按钮创建两个不同的按钮对象和不同的onclick侦听器。

Button butdate = (Button)this.findViewById(R.id.day);
Button buttime = (Button)this.findViewById(R.id.time);
butdate.setOnClickListener( new OnClickListener() {
        @Override
        public void onClick( View v )
        {
            //code to set date in textview
        }
    });


buttime.setOnClickListener( new OnClickListener() {
        @Override
        public void onClick( View v )
        {
            //code to set time in textview
        }
    });

Android：我无法将日期传递给我的字符串ID

2 个答案: