Android 使用updateDate（）方法设置日期选择器的日期

我目前正在制作一个日期/时间选择器类。基本上，我创建了3个单选按钮：“明天”、“两天内”和“下周”

我想做的是让这些单选按钮自动设置日期选择器提前1天、2天和7天

当用户单击单选按钮时，我尝试使用UpdateDaint year、int month、int day方法来更新我的日期选择器，但是当单击任何单选按钮时，都不会发生任何事情

是否有一种特定的方法可以在不使用自动取款器按钮的情况下更改日期选择器显示的日期

以下是我的课程代码：

 package com.inviscidlabs.schooled;

import java.util.Calendar;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.DatePicker;
import android.widget.RadioButton;
import android.widget.RadioGroup;

public class DateTimePicker extends Activity{


    private DatePicker datePicker;

    private RadioGroup dtpRadGroup;
    private RadioButton rTomorrow;
    private RadioButton rIn2Days;
    private RadioButton rNextWeek;


    private Calendar cNow;
    private Calendar c;


    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        //declare resources
        setContentView(R.layout.datetimepicker);
        dtpRadGroup=(RadioGroup) findViewById(R.id.dtp_radiogroup);
        rTomorrow=(RadioButton) findViewById(R.id.dtp_button_tomorrow);
        rIn2Days=(RadioButton) findViewById(R.id.dtp_button_twodays);
        rNextWeek= (RadioButton) findViewById(R.id.dtp_button_nextweek);
        datePicker= (DatePicker) findViewById(R.id.dtp_datepicker);

        cNow= Calendar.getInstance();
        cNow.setLenient(true);      c.setLenient(true);
        datePicker.init(cNow.get(Calendar.YEAR), cNow.get(Calendar.MONTH), cNow.get(Calendar.DAY_OF_MONTH), dListener);

    }

    public void onClick(View v){

        switch(v.getId()){

        case R.id.dtp_button_finished:

            break;
        }

    }

    public void onRadioButtonClicked(View v){
        c=Calendar.getInstance();



        switch(v.getId()){

        case R.id.dtp_button_tomorrow:
             c.add(Calendar.DAY_OF_YEAR, 1);
             datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));

            break;
        case R.id.dtp_button_twodays:
             c.add(Calendar.DAY_OF_YEAR, 2);
             datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));
            break;
        case R.id.dtp_button_nextweek:
             c.add(Calendar.DAY_OF_YEAR, 7);
             datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));
            break;
        }
    }





    private DatePicker.OnDateChangedListener dListener = new DatePicker.OnDateChangedListener() {

        public void onDateChanged(DatePicker view, int year, int monthOfYear,
                int dayOfMonth) {

                Calendar cPickerDate = Calendar.getInstance();
                cPickerDate.set(year, monthOfYear, dayOfMonth);
                int dayOfYear = cPickerDate.get(Calendar.DAY_OF_YEAR);
                Log.v("day of year", String.valueOf(dayOfYear));



                //automatically checks radio buttons if user manually adjust picker
                if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+1){
                    rTomorrow.setChecked(true);
                }
                else if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+2){
                    rIn2Days.setChecked(true);
                }
                else if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+7){
                    rNextWeek.setChecked(true);
                } else {
                    dtpRadGroup.clearCheck();
                }

        }
    };





}

---

使用下面修改过的代码：

package com.inviscidlabs.schooled;

import java.util.Calendar;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.DatePicker;
import android.widget.RadioButton;
import android.widget.RadioGroup;

public class DateTimePicker extends Activity{

    private static int TODAY = 0;
    private static int NEXTDAY = 1;
    private static int NEXTWEEK = 2;

    private DatePicker datePicker;
    private RadioGroup dtpRadGroup;
    private RadioButton rTomorrow;
    private RadioButton rIn2Days;
    private RadioButton rNextWeek;


    private Calendar cNow;
    private Calendar c;


    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        //declare resources
        setContentView(R.layout.datetimepicker);
        dtpRadGroup=(RadioGroup) findViewById(R.id.dtp_radiogroup);
        rTomorrow=(RadioButton) findViewById(R.id.dtp_button_tomorrow);
        rIn2Days=(RadioButton) findViewById(R.id.dtp_button_twodays);
        rNextWeek= (RadioButton) findViewById(R.id.dtp_button_nextweek);
        datePicker= (DatePicker) findViewById(R.id.dtp_datepicker);

        cNow= Calendar.getInstance();
        cNow.setLenient(true);      c.setLenient(true);
        datePicker.init(cNow.get(Calendar.YEAR), cNow.get(Calendar.MONTH), cNow.get(Calendar.DAY_OF_MONTH), dListener);

    }

    public void onClick(View v){

        switch(v.getId()){

        case R.id.dtp_button_finished:

            break;
        }

    }

    public void onRadioButtonClicked(View v){
        c=Calendar.getInstance();



        switch(v.getId()){

        case R.id.dtp_button_tomorrow:
             c.add(Calendar.DAY_OF_YEAR, 1);
             showDialog(TODAY);
            // datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));

            break;
        case R.id.dtp_button_twodays:
             c.add(Calendar.DAY_OF_YEAR, 2);
             showDialog(NEXTDAY);
             //datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));
            break;
        case R.id.dtp_button_nextweek:
             c.add(Calendar.DAY_OF_YEAR, 7);
             showDialog(NEXTWEEK);
             //datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));
            break;
        }
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        final Calendar c = Calendar.getInstance();
        switch (id) {
        case TODAY:
            c.add(Calendar.DAY_OF_YEAR, 1);
        case NEXTDAY:
            c.add(Calendar.DAY_OF_YEAR, 2);
        case NEXTWEEK:
            c.add(Calendar.DAY_OF_YEAR, 7);
        }
        DatePickerDialog _date_repeat = new DatePickerDialog(this, mDateSetListener,c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH)){
                @Override
                public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth)
                {   
                     Calendar cPickerDate = Calendar.getInstance();
                        cPickerDate.set(year, monthOfYear, dayOfMonth);
                        int dayOfYear = cPickerDate.get(Calendar.DAY_OF_YEAR);
                        Log.v("day of year", String.valueOf(dayOfYear));



                        //automatically checks radio buttons if user manually adjust picker
                        if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+1){
                            rTomorrow.setChecked(true);
                        }
                        else if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+2){
                            rIn2Days.setChecked(true);
                        }
                        else if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+7){
                            rNextWeek.setChecked(true);
                        } else {
                            dtpRadGroup.clearCheck();
                        }                   
                }
            };  
        };
        return _date_repeat;
    }
}

---

使用下面修改过的代码：

package com.inviscidlabs.schooled;

import java.util.Calendar;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.DatePicker;
import android.widget.RadioButton;
import android.widget.RadioGroup;

public class DateTimePicker extends Activity{

    private static int TODAY = 0;
    private static int NEXTDAY = 1;
    private static int NEXTWEEK = 2;

    private DatePicker datePicker;
    private RadioGroup dtpRadGroup;
    private RadioButton rTomorrow;
    private RadioButton rIn2Days;
    private RadioButton rNextWeek;


    private Calendar cNow;
    private Calendar c;


    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        //declare resources
        setContentView(R.layout.datetimepicker);
        dtpRadGroup=(RadioGroup) findViewById(R.id.dtp_radiogroup);
        rTomorrow=(RadioButton) findViewById(R.id.dtp_button_tomorrow);
        rIn2Days=(RadioButton) findViewById(R.id.dtp_button_twodays);
        rNextWeek= (RadioButton) findViewById(R.id.dtp_button_nextweek);
        datePicker= (DatePicker) findViewById(R.id.dtp_datepicker);

        cNow= Calendar.getInstance();
        cNow.setLenient(true);      c.setLenient(true);
        datePicker.init(cNow.get(Calendar.YEAR), cNow.get(Calendar.MONTH), cNow.get(Calendar.DAY_OF_MONTH), dListener);

    }

    public void onClick(View v){

        switch(v.getId()){

        case R.id.dtp_button_finished:

            break;
        }

    }

    public void onRadioButtonClicked(View v){
        c=Calendar.getInstance();



        switch(v.getId()){

        case R.id.dtp_button_tomorrow:
             c.add(Calendar.DAY_OF_YEAR, 1);
             showDialog(TODAY);
            // datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));

            break;
        case R.id.dtp_button_twodays:
             c.add(Calendar.DAY_OF_YEAR, 2);
             showDialog(NEXTDAY);
             //datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));
            break;
        case R.id.dtp_button_nextweek:
             c.add(Calendar.DAY_OF_YEAR, 7);
             showDialog(NEXTWEEK);
             //datePicker.updateDate(c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));
            break;
        }
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        final Calendar c = Calendar.getInstance();
        switch (id) {
        case TODAY:
            c.add(Calendar.DAY_OF_YEAR, 1);
        case NEXTDAY:
            c.add(Calendar.DAY_OF_YEAR, 2);
        case NEXTWEEK:
            c.add(Calendar.DAY_OF_YEAR, 7);
        }
        DatePickerDialog _date_repeat = new DatePickerDialog(this, mDateSetListener,c.get(Calendar.YEAR),c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH)){
                @Override
                public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth)
                {   
                     Calendar cPickerDate = Calendar.getInstance();
                        cPickerDate.set(year, monthOfYear, dayOfMonth);
                        int dayOfYear = cPickerDate.get(Calendar.DAY_OF_YEAR);
                        Log.v("day of year", String.valueOf(dayOfYear));



                        //automatically checks radio buttons if user manually adjust picker
                        if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+1){
                            rTomorrow.setChecked(true);
                        }
                        else if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+2){
                            rIn2Days.setChecked(true);
                        }
                        else if(dayOfYear==cNow.get(Calendar.DAY_OF_YEAR)+7){
                            rNextWeek.setChecked(true);
                        } else {
                            dtpRadGroup.clearCheck();
                        }                   
                }
            };  
        };
        return _date_repeat;
    }
}

---

谢谢你的快速回复。原来我的代码还可以，但我在手机上运行的ROM在平板电脑上运行正常。您的更正效果很好，但我必须使用DatePicker，因为我的目的是制作一个半定制的DateTimePickerDialog感谢您的快速响应。原来我的代码还可以，但我在手机上运行的ROM在平板电脑上运行正常。您的更正效果很好，但我必须使用DatePicker，因为我的目的是制作一个半定制的DateTimePickerDialog