我是一个用户必须选择两个日期的应用程序，即从日期和到日期。这些字段不应接受任何低于当前日期的日期。已经浏览了本网站的一些帖子，并通过使用单个datepicker对话框和单个ondatesetListener来实现此功能。
我的问题是我无法验证到目前为止应该始终大于或等于从日期的条件。请帮助我。我无法捕获从日期，因为活动日期超出活动结束日期提前致谢。以下是代码：
public class Leave_form extends Activity
{
private static EditText tvDislpayResult;
private Button startPickDate;
private Button endPickDate;
private Calendar startDate;
private Calendar endDate;
//private EditText startDateDisplay;
//private EditText endDateDisplay;
static final int DATE_DIALOG_ID = 0;
private TextView startDateDisplay;
private TextView endDateDisplay;
private TextView activeDateDisplay;
private Calendar activeDate;
private Calendar currentDate;
private Calendar fromDate;
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_leave_form);
/* capture our View elements for the start date function */
startDateDisplay = (EditText) findViewById(R.id.e_from_date);
startPickDate = (Button) findViewById(R.id.Set_date1);
/*get tday date */
currentDate=Calendar.getInstance();
Log.d("currentDate ",""+(currentDate.get(Calendar.DAY_OF_MONTH))+(currentDate.get(Calendar.MONTH)+1)+(currentDate.get(Calendar.YEAR)));
/* get the current date */
startDate = Calendar.getInstance();
Log.d("startdate ",""+(startDate.get(Calendar.DAY_OF_MONTH))+(startDate.get(Calendar.MONTH)+1)+(startDate.get(Calendar.YEAR)));
/* add a click listener to the button */
startPickDate.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
showDateDialog(startDateDisplay, startDate);
Log.d("startDate-on click ",""+(startDate.get(Calendar.DAY_OF_MONTH))+(startDate.get(Calendar.MONTH)+1)+(startDate.get(Calendar.YEAR)));
}
});
/* capture our View elements for the end date function */
endDateDisplay = (EditText) findViewById(R.id.e_to_date);
endPickDate = (Button) findViewById(R.id.Set_date2);
/* get the current date */
endDate = Calendar.getInstance();
Log.d("endDate ",""+(endDate.get(Calendar.DAY_OF_MONTH))+(endDate.get(Calendar.MONTH)+1)+(endDate.get(Calendar.YEAR)));
/* add a click listener to the button */
endPickDate.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
showDateDialog(endDateDisplay, endDate);
Log.d("endDate -on click",""+(endDate.get(Calendar.DAY_OF_MONTH))+(endDate.get(Calendar.MONTH)+1)+(endDate.get(Calendar.YEAR)));
}
});
/* 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.DAY_OF_MONTH) ).append("-")
.append(date.get(Calendar.MONTH)+1).append("-")
.append(date.get(Calendar.YEAR)).append(" "));
Log.d("msg","date:"+(date.get(Calendar.DAY_OF_MONTH))+(date.get(Calendar.MONTH)+1)+(date.get(Calendar.YEAR)));
fromDate=date;
}
public void showDateDialog(TextView dateDisplay, Calendar date)
{
Log.d("SDD", dateDisplay.getText().toString());
Log.d("startdate ",""+(currentDate.get(Calendar.DAY_OF_MONTH))+(currentDate.get(Calendar.MONTH)+1)+(currentDate.get(Calendar.YEAR)));
activeDateDisplay = dateDisplay;
activeDate = date;
showDialog(DATE_DIALOG_ID);
}
private OnDateSetListener dateSetListener = new OnDateSetListener()
{
@SuppressWarnings("deprecation")
@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);
Log.d("activeDate-on dateset ",""+(activeDate.get(Calendar.DAY_OF_MONTH))+(activeDate.get(Calendar.MONTH)+1)+(activeDate.get(Calendar.YEAR)));
if(currentDate.after(activeDate)|(currentDate.equals(activeDate)))
{
Toast toast=Toast.makeText(Leave_form.this, "Please select a valid date", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
else
{
if((currentDate.after(activeDate)|(currentDate.equals(activeDate)))&&(startDateDisplay.getText().toString()!=null))
{
Log.d("startDate-on click ",""+(startDate.get(Calendar.DAY_OF_MONTH))+(startDate.get(Calendar.MONTH)+1)+(startDate.get(Calendar.YEAR)));
if(startDate.before(activeDate))
{
updateDisplay(activeDateDisplay, activeDate);
}
else
{
Toast.makeText(getApplicationContext(), "enter valid date", Toast.LENGTH_SHORT).show();
/*AlertDialog alertDialog=new AlertDialog.Builder(Leave_form.this).create();
alertDialog.setMessage("Choose a valid date");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
alertDialog.show();*/
}
}
else
{
updateDisplay(activeDateDisplay, activeDate);
}
}
unregisterDateDisplay();
}
};
private void unregisterDateDisplay()
{
Log.d("startdate ",""+(currentDate.get(Calendar.DAY_OF_MONTH))+(currentDate.get(Calendar.MONTH)+1)+(currentDate.get(Calendar.YEAR)));
Log.d("from date:","-"+activeDate.DAY_OF_MONTH+activeDate.MONTH+activeDate.YEAR);
activeDateDisplay = null;
activeDate = null;
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
Log.d("fromdate","msg");
Log.d("id",""+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:
Log.d("id",""+DATE_DIALOG_ID);
((DatePickerDialog) dialog).updateDate(activeDate.get(Calendar.YEAR), activeDate.get(Calendar.MONTH), activeDate.get(Calendar.DAY_OF_MONTH));
break;
}
}
public void leave(View view)
{
Intent intent1=new Intent(this,Rough.class);
setContentView(R.layout.activity_rough);
startActivity(intent1);
}
public void logout(View view)
{
Intent intent2=new Intent (this,MainActivity.class);
setContentView(R.layout.activity_main);
startActivity(intent2);
}
}
答案 0 :(得分：3)
最好更改此类代码：
if((currentDate.after(activeDate)|(currentDate.equals(activeDate)))&&(startDateDisplay.getText().toString()!=null))
到多个if块，如：
if((currentDate.after(activeDate)||(currentDate.equals(activeDate))
if(!startDateDisplay.getText().toString().equals(null))
请仔细注意差异！
另请参阅 answer here
答案 1 :(得分：2)
<强>解决..
感谢@Amit的答案。我的问题已经解决，它就像一个魅力。我只更改了OnDateSetListener段中的代码。以下是代码：
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);
Date fromDate,toDate;
try
{
//checks if the date chosen by the user is greater than the current system date.Doesnt allow to choose past date
if(currentDate.before(activeDate)||currentDate.equals(activeDate))
{
//checks if the from date edit text is empty or not
if(startDateDisplay.getText().toString().isEmpty())
{
updateDisplay(activeDateDisplay, activeDate);
}
else
{
//converts the date in the from date edittextbox and active date to dd-mm-yyyy format
SimpleDateFormat sdf=new SimpleDateFormat("dd-MM-yyyy");
fromDate=sdf.parse(startDateDisplay.getText().toString());
Log.d("fromdate",""+fromDate);
String temp=(activeDate.get(Calendar.DAY_OF_MONTH))+"-"+(activeDate.get(Calendar.MONTH)+1)+"-"+(activeDate.get(Calendar.YEAR));
toDate=sdf.parse(temp);
Log.d("todate",""+toDate);
//checks if todate is greater or equal to from date
if ((toDate.after(fromDate))||(toDate.equals(fromDate)))
{
updateDisplay(activeDateDisplay, activeDate);
}
else
{
Toast toast=new Toast(getBaseContext());
toast=Toast.makeText(Leave_form.this, "To date should be greater than From date", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}
}
else
{
Toast toast=new Toast(getBaseContext());
toast=Toast.makeText(Leave_form.this, "Please enter a valid date", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}
catch(Exception e)
{
Log.e("excepion",e.getMessage().toString());
}
unregisterDateDisplay();
}
};
感谢各位的回答。 ：）
答案 2 :(得分：0)
package com.example.pickerdate;
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.DatePicker.OnDateChangedListener;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private TextView mDateDisplay;
private int mYear;
private int year1;
private int mMonth;
private int mDay;
private int month;
private int day;
static final int DATE_DIALOG_ID = 1;
Button pickDate;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDateDisplay = (TextView) findViewById(R.id.dateDisplay);
pickDate = (Button) findViewById(R.id.pickDate);
pickDate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
System.out.println("hello3");
showDialog(DATE_DIALOG_ID);
}
});
System.out.println("hello1");
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
updateDisplay();
year1 = mYear;
month = mMonth;
day = mDay;
}
@Override
protected Dialog onCreateDialog(int id) {
DatePickerDialog _date = null;
switch (id) {
case DATE_DIALOG_ID:
_date = new DatePickerDialog(this, mDateSetListener, mYear, mMonth,
mDay) {
@Override
public void onDateChanged(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
System.out.println("----------onDateChanged()-----------"
+ mYear + "--" + year);
System.out.println("----------onDateChanged()-----------"
+ mMonth + "--" + monthOfYear);
System.out.println("----------onDateChanged()-----------"
+ mDay + "--" + dayOfMonth);
/*
* These lines of commented code used for only setting the
* maximum date on Date Picker..
*
* if (year > mYear && year) view.updateDate(mYear, mMonth,
* mDay);
*
* if (monthOfYear > mMonth && year == mYear )
* view.updateDate(mYear, mMonth, mDay);
*
* if (dayOfMonth > mDay && year == mYear && monthOfYear ==
* mMonth) view.updateDate(mYear, mMonth, mDay);
*/
// these below lines of code used for setting the maximum as
// well as minimum dates on Date Picker Dialog..
if ((mYear > year)
|| ((mMonth > monthOfYear) && (mYear == year))
|| ((mDay > dayOfMonth) && (mYear == year) && (mMonth == monthOfYear))) {
view.updateDate(year1, month, day);
}
}
};
}
System.out.println("hello5");
return _date;
}
protected void onPrepareDialog(int id, Dialog dialog) {
switch (id) {
case DATE_DIALOG_ID:
System.out.println("hello6");
((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay);
break;
}
}
private void updateDisplay() {
System.out.println("hello2");
mDateDisplay.setText(new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("-").append(mDay).append("-")
.append(mYear).append(" "));
}
private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
System.out.println("hello7");
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
System.out.println("year=" + year);
System.out.println("month=" + monthOfYear);
System.out.println("day=" + dayOfMonth);
updateDisplay();
}
};
}
答案 3 :(得分：0)
在这里，我展示了一种简单的技术，可以将用户输入的字符串转换为Date 并根据我们的逻辑比较。
for($i=0; $i<sizeof($arr); $i++){
$data = $arr[$i];
$chat_categories = $data[chat_categories];
$display_name = $data[display_name];
$user_email = $data[user_email];
$user_login = $data[user_login];
$success = $wpdb->query("UPDATE $userTableName SET chat_categories = '$chat_categories' WHERE user_email = '$user_email' AND user_login ='$user_login' ");
}