同一活动中的多个 DatePicker [英] Multiple DatePickers in same activity
问题描述
我对 Android 平台完全陌生，在学习开发过程的同时一直在构建应用程序.
I am absolutely new to the Android platform and have been building an application while learning the development process.
目前，我正在开展一项需要部署 2 个日期选择器的活动.一个是开始日期"，另一个是结束日期".我一直在关注 android 开发者页面上的 DatePicker 教程:http://developer.android.com/resources/tutorials/views/hello-datepicker.html
Currently, I am working on an activity in which i need to deploy 2 date pickers. One is a "Start Date" and the other is an "End date". I have been following the DatePicker tutorial on the android developers page here: http://developer.android.com/resources/tutorials/views/hello-datepicker.html
对于一个 DatePicker，它工作得很好.
For one DatePicker, it works just fine.
现在我的问题是，当我为第二个日期选择器复制整个过程时，它在模拟器和手机上都显示得很好.但是，无论我按哪个按钮选择日期，都只会更新第一个 TextView，而第二个 TextView 会继续显示当前日期.
Now my problem is, when I replicate the whole process for a second date picker, it shows up just fine on the emulator as well as on the handset. But when no matter which button I press to select the dates, only the first TextView is updated and the second TextView keeps showing the current date.
代码如下:
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(" "));
}
/* 当用户在对话框中为开始日期函数设置"日期时收到的回调 */
/* the callback received when the user "sets" the date in the dialog for the start date function */
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;
}
}
请告知代码所需的更改.
Please advise on the changes required for the code.
推荐答案
你需要制作 2 个独立的 DatePicker Dialogs
You need to make 2 separate DatePicker Dialogs
制作 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;
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) {
.....
}
};
为它们创建单独的对话框
Create Seperate Dialogs for both of them
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;
}
这篇关于同一活动中的多个 DatePicker的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
