同一活动中的多个DatePickers

Question

同一活动中的多个DatePickers

Sid*_*ele 12 android date datepicker picker

我是Android平台的新手,在学习开发过程的同时构建了一个应用程序.

目前,我正在开展一项活动,我需要部署2个日期选择器.一个是"开始日期",另一个是"结束日期".我一直在Android开发者页面上关注DatePicker教程:http://developer.android.com/resources/tutorials/views/hello-datepicker.html

对于一个DatePicker,它工作得很好.

现在我的问题是,当我复制第二个日期选择器的整个过程时,它在模拟器和手机上都显示正常.但是,无论我按哪个按钮选择日期,只有第一个TextView会更新,第二个TextView会一直显示当前日期.

这是代码:

package com.datepicker;

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

public class datepicker extends Activity {

private TextView mDateDisplay;
private TextView endDateDisplay;
private Button mPickDate;
private Button endPickDate;
private int mYear;
private int mMonth;
private int mDay;

static final int START_DATE_DIALOG_ID = 0;
static final int END_DATE_DIALOG_ID = 0;


/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    /*  capture our View elements for the start date function   */
    mDateDisplay = (TextView) findViewById(R.id.startdateDisplay);
    mPickDate = (Button) findViewById(R.id.startpickDate);

    /* add a click listener to the button   */
    mPickDate.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            showDialog(START_DATE_DIALOG_ID);
        }
    });

    /* get the current date */
    final Calendar c = Calendar.getInstance();
    mYear = c.get(Calendar.YEAR);
    mMonth = c.get(Calendar.MONTH);
    mDay = c.get(Calendar.DAY_OF_MONTH);

    /* display the current date (this method is below)  */
    updateStartDisplay();


 /* capture our View elements for the end date function */
    endDateDisplay = (TextView) findViewById(R.id.enddateDisplay);
    endPickDate = (Button) findViewById(R.id.endpickDate);

    /* add a click listener to the button   */
    endPickDate.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            showDialog(END_DATE_DIALOG_ID);
        }
    });

    /* get the current date */
    final Calendar c1 = Calendar.getInstance();
    mYear = c1.get(Calendar.YEAR);
    mMonth = c1.get(Calendar.MONTH);
    mDay = c1.get(Calendar.DAY_OF_MONTH);

    /* display the current date (this method is below)  */
    updateEndDisplay();
}



private void updateEndDisplay() {
    endDateDisplay.setText(
            new StringBuilder()
                // Month is 0 based so add 1
                .append(mMonth + 1).append("-")
                .append(mDay).append("-")
                .append(mYear).append(" "));

}



private void updateStartDisplay() {
    mDateDisplay.setText(
            new StringBuilder()
                // Month is 0 based so add 1
                .append(mMonth + 1).append("-")
                .append(mDay).append("-")
                .append(mYear).append(" "));


}

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/*当用户在对话框中"设置"开始日期函数的日期时收到的回调*/

 private DatePickerDialog.OnDateSetListener mDateSetListener =
            new DatePickerDialog.OnDateSetListener() {

            public void onDateSet(DatePicker view, int year, 
                                  int monthOfYear, int dayOfMonth) {
                mYear = year;
                mMonth = monthOfYear;
                mDay = dayOfMonth;
                updateStartDisplay();
            }
        };

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case START_DATE_DIALOG_ID:
        return new DatePickerDialog(this,
                    mDateSetListener,
                    mYear, mMonth, mDay);
    }
    return null;
}
/* the callback received when the user "sets" the date in the dialog for the end date function  */

private DatePickerDialog.OnDateSetListener endDateSetListener =
        new DatePickerDialog.OnDateSetListener() {

            public void onDateSet(DatePicker view, int year, 
                                  int monthOfYear, int dayOfMonth) {
                mYear = year;
                mMonth = monthOfYear;
                mDay = dayOfMonth;
                updateStartDisplay();
            }
        };

protected Dialog onCreateDialog1(int id) {
    switch (id) {
    case END_DATE_DIALOG_ID:
        return new DatePickerDialog(this,
                    endDateSetListener,
                    mYear, mMonth, mDay);
    }
    return null;
}

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}

请告知代码所需的更改.

Answer 1

Ada*_* L. 30

我有一个解决方案,允许无限数量的日期字段,而无需添加新的对话框类型.当用户单击其中一个按钮时,我会在启动DatePickerDialog之前注册当前正在修改哪个TextView和Calendar.对话框的OnDateSetListener然后更新已注册的TextView和Calendar.

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;

public class MultiDatePickerActivity extends Activity {

    private TextView startDateDisplay;
    private TextView endDateDisplay;
    private Button startPickDate;
    private Button endPickDate;
    private Calendar startDate;
    private Calendar endDate;

    static final int DATE_DIALOG_ID = 0;

    private TextView activeDateDisplay;
    private Calendar activeDate;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.multidatepicker);

        /*  capture our View elements for the start date function   */
        startDateDisplay = (TextView) findViewById(R.id.startDateDisplay);
        startPickDate = (Button) findViewById(R.id.startPickDate);

        /* get the current date */
        startDate = Calendar.getInstance();

        /* add a click listener to the button   */
        startPickDate.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                showDateDialog(startDateDisplay, startDate);
            }
        });

        /* capture our View elements for the end date function */
        endDateDisplay = (TextView) findViewById(R.id.endDateDisplay);
        endPickDate = (Button) findViewById(R.id.endPickDate);

        /* get the current date */
        endDate = Calendar.getInstance();

        /* add a click listener to the button   */
        endPickDate.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                showDateDialog(endDateDisplay, endDate);
            }
        });

        /* display the current date (this method is below)  */
        updateDisplay(startDateDisplay, startDate);
        updateDisplay(endDateDisplay, endDate);
    }

    private void updateDisplay(TextView dateDisplay, Calendar date) {
        dateDisplay.setText(
                new StringBuilder()
                    // Month is 0 based so add 1
                    .append(date.get(Calendar.MONTH) + 1).append("-")
                    .append(date.get(Calendar.DAY_OF_MONTH)).append("-")
                    .append(date.get(Calendar.YEAR)).append(" "));

    }

    public void showDateDialog(TextView dateDisplay, Calendar date) {
        activeDateDisplay = dateDisplay;
        activeDate = date;
        showDialog(DATE_DIALOG_ID);
    }

    private OnDateSetListener dateSetListener = new OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            activeDate.set(Calendar.YEAR, year);
            activeDate.set(Calendar.MONTH, monthOfYear);
            activeDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
            updateDisplay(activeDateDisplay, activeDate);
            unregisterDateDisplay();
        }
    };

    private void unregisterDateDisplay() {
        activeDateDisplay = null;
        activeDate = null;
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
            case DATE_DIALOG_ID:
                return new DatePickerDialog(this, dateSetListener, activeDate.get(Calendar.YEAR), activeDate.get(Calendar.MONTH), activeDate.get(Calendar.DAY_OF_MONTH));
        }
        return null;
    }

    @Override
    protected void onPrepareDialog(int id, Dialog dialog) {
        super.onPrepareDialog(id, dialog);
        switch (id) {
            case DATE_DIALOG_ID:
                ((DatePickerDialog) dialog).updateDate(activeDate.get(Calendar.YEAR), activeDate.get(Calendar.MONTH), activeDate.get(Calendar.DAY_OF_MONTH));
                break;
        }
    }
}

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这种灵活性在您不知道运行时需要多少日期选择器的应用程序中非常有用.

Answer 2

st0*_*0le 26

您需要制作2个单独的DatePicker对话框

让2个听众

int from_year, from_month, from_day,to_year, to_month, to_day; //initialize them to current date in onStart()/onCreate()
DatePickerDialog.OnDateSetListener from_dateListener,to_dateListener;

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实施它们......

         from_dateListener = new OnDateSetListener(){

            public void onDateSet(DatePicker arg0, int arg1, int arg2, int arg3) {

                          ...

                }
            }

        };
        to_dateListener = new OnDateSetListener(){
            public void onDateSet(DatePicker arg0, int arg1, int arg2, int arg3) {
                .....
            }
        };

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为它们创建单独的对话框

int DATE_PICKER_TO = 0;
int DATE_PICKER_FROM = 1;

@Override
protected Dialog onCreateDialog(int id) {

    switch(id){
        case DATE_PICKER_FROM:
                return new DatePickerDialog(this, from_dateListener, from_year, from_month, from_day); 
            case DATE_PICKER_TO:
                return new DatePickerDialog(this, to_dateListener, to_year, to_month, to_day);
    }
        return null;
}

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Answer 3

San*_*yrm 8

将Adam的选项扩展为稍微轻一点的权重解释并且可能更有用,我决定为实例化对话框请求的元素ID维护一个int引用,然后在最终事件处理程序中引用它.如果您有多个日期输入但需要针对每个或每个组的特定格式,这具有在此方法中很好地适应switch语句的额外好处.下面的所有代码段都直接在我的Activity类中

实例变量

private static final int        DIALOG_DATE_PICKER  = 100;
private int                     datePickerInput;

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对话处理程序

@Override
public Dialog onCreateDialog(int id)
{
    switch(id) {
        case DIALOG_DATE_PICKER:
            final Calendar c = Calendar.getInstance();
            DatePickerDialog dialog = new DatePickerDialog(this, dateSetListener, c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH));
            return dialog;
    }
    return null;
}

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单击"侦听器"

private OnClickListener datePickerListener =
    new OnClickListener()
{
    @Override
    public void onClick(View v)
    {
        datePickerInput = v.getId();
        showDialog(DIALOG_DATE_PICKER);
    }
};

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日期选择处理程序

private DatePickerDialog.OnDateSetListener dateSetListener =
    new DatePickerDialog.OnDateSetListener()
{
    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
    {
        switch( datePickerInput ) {
            case R.id.datePicker1:
                ((EditText) findViewById( datePickerInput ))
                    .setText(...);
                ...
                break;
            case R.id.datePicker2:
                ...
                break;
            default:
                ...
                break;
        }
    }
};

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Answer 4

Sta*_*ica 5

我想我找到了一个更清洁的解决方案。这是谷歌建议和我在这里阅读的评论之间的混合。在我的情况下，它甚至在从 Viewpager 的片段中调用时也能工作。基本上，当从我的片段调用选择器对话框时，我将一组参数传递给对话框片段，如下定义：Android：将数据（额外）传递给片段然后我在我的 DialogFragment 类中取回包值，然后打开它的价值。

以下是我的片段代码中 startDate 和 endDate 按钮的两个侦听器：

    mWylStartDate.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Bundle bundle = new Bundle();
            bundle.putInt("DATE",1);

            DialogFragment newFragment = new DatePickerFragment();
            newFragment.setArguments(bundle);

            newFragment.show(getFragmentManager(), "datePicker");
        }
    });

    mWylEndDate.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Bundle bundle = new Bundle();
            bundle.putInt("DATE",2);

            DialogFragment newFragment = new DatePickerFragment();
            newFragment.setArguments(bundle);

            newFragment.show(getFragmentManager(), "datePicker");

        }
    });

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这是我的 DatePickerFragment 类

public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener
{

    static final int START_DATE = 1;
    static final int END_DATE = 2;

    private int mChosenDate;

    int cur = 0;


    @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);


        Bundle bundle = this.getArguments();
        if (bundle != null)
        {
            mChosenDate = bundle.getInt("DATE", 1);
        }


        switch (mChosenDate)
        {

            case START_DATE:
                cur = START_DATE;
                return new DatePickerDialog(getActivity(), this, year, month, day);

            case END_DATE:
                cur = END_DATE;
                return new DatePickerDialog(getActivity(), this, year, month, day);

        }
        return null;
    }


    @Override
    public void onDateSet(DatePicker datePicker, int year, int month, int day)
    {

        if (cur == START_DATE)
        {
            // set selected date into textview
            Log.v("Date Début", "Date1 : " + new StringBuilder().append(month + 1)
                    .append("-").append(day).append("-").append(year)
                    .append(" "));
        } else
        {
            Log.v("Date fin", "Date2 : " + new StringBuilder().append(month + 1)
                    .append("-").append(day).append("-").append(year)
                    .append(" "));
        }
    }
}

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