日期轮选择器出了问题。它必须更改特定月份的日期。 30，二月没有28天。在31，所有月份变为31.但是另一天，它运作良好。（例如。在模拟器日期是1-2-2014，它运作良好，但昨天，模拟器日期是31-1-2014，所有月份是31 。）另一个问题，在2月30日，2月没有28.我该怎么办，给我一些建议。
package com.example.aa;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import android.app.Dialog;
import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TableLayout.LayoutParams;
import android.widget.TextView;
import kankan.wheel.widget.adapters.ArrayWheelAdapter;
import kankan.wheel.widget.adapters.NumericWheelAdapter;
import kankan.wheel.widget.OnWheelChangedListener;
import kankan.wheel.widget.WheelView;
public class DatePickerDailog extends Dialog {
private Context Mcontex;
private int NoOfYear = 113;
public DatePickerDailog(Context context, Calendar calendar,
final DatePickerListner dtp) {
super(context);
Mcontex = context;
LinearLayout lytmain = new LinearLayout(Mcontex);
lytmain.setOrientation(LinearLayout.VERTICAL);
LinearLayout lytdate = new LinearLayout(Mcontex);
LinearLayout lytbutton = new LinearLayout(Mcontex);
Button btnset = new Button(Mcontex);
Button btncancel = new Button(Mcontex);
btnset.setText("Set");
btncancel.setText("Cancel");
final WheelView month = new WheelView(Mcontex);
month.setMinimumHeight(300);
final WheelView year = new WheelView(Mcontex);
year.setMinimumHeight(300);
final WheelView day = new WheelView(Mcontex);
day.setMinimumHeight(300);
lytdate.addView(day, new LayoutParams(
android.view.ViewGroup.LayoutParams.WRAP_CONTENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 1.2f));
lytdate.addView(month, new LayoutParams(
android.view.ViewGroup.LayoutParams.WRAP_CONTENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 0.8f));
lytdate.addView(year, new LayoutParams(
android.view.ViewGroup.LayoutParams.WRAP_CONTENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 1f));
requestWindowFeature(Window.FEATURE_NO_TITLE);
lytbutton.addView(btnset, new LayoutParams(
android.view.ViewGroup.LayoutParams.FILL_PARENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 1f));
lytmain.addView(lytbutton);
lytmain.addView(lytdate);
setContentView(lytmain);
getWindow().setLayout(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
getWindow().setBackgroundDrawableResource(android.R.color.white);
OnWheelChangedListener listener = new OnWheelChangedListener() {
public void onChanged(WheelView wheel, int oldValue, int newValue) {
updateDays(year, month, day);
}
};
// month
int curMonth = calendar.get(Calendar.MONTH);
Log.i("curMonth",curMonth+"");
String months[] = new String[] { "January", "February", "March",
"April", "May", "June", "July", "August", "September",
"October", "November", "December" };
month.setViewAdapter(new DateArrayAdapter(context, months, curMonth));
month.setCurrentItem(curMonth);
month.addChangingListener(listener);
Calendar cal = Calendar.getInstance();
// year
int curYear = calendar.get(Calendar.YEAR);
Log.i("curYear", curYear+"");
int Year = cal.get(Calendar.YEAR);
ArrayList<Integer> yearlist = new ArrayList<Integer>();
int [] yearArray=null;
for(int i = 1900 ; i <= curYear ; i++){
yearlist.add(i);
}
yearArray = new int[yearlist.size()];
for(int i = 0 ; i < yearArray.length ;i++){
yearArray[i] = yearlist.get(i);
}
year.setViewAdapter(new DateNumericAdapter(context,1900,curYear, curYear));
year.setCurrentItem(curYear-1900);
year.addChangingListener(listener);
// day
updateDays(year, month, day);
day.setCurrentItem(calendar.get(Calendar.DAY_OF_MONTH) - 1);
Log.i("calendar.get(Calendar.DAY_OF_MONTH) - 1",calendar.get(Calendar.DAY_OF_MONTH) - 1+"");
btnset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Calendar c = updateDays(year, month, day);
dtp.OnDoneButton(DatePickerDailog.this, c);
}
});
btncancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dtp.OnCancelButton(DatePickerDailog.this);
}
});
}
Calendar updateDays(WheelView year, WheelView month, WheelView day) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR,1900+year.getCurrentItem());
calendar.set(Calendar.MONTH, month.getCurrentItem());
Log.i("month.getCurrentItem()",month.getCurrentItem()+"");
int maxDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
Log.i("MaxDays",maxDays+"");
day.setViewAdapter(new DateNumericAdapter(Mcontex, 1, maxDays, calendar.get(Calendar.DAY_OF_MONTH) - 1));
int curDay = Math.min(maxDays, day.getCurrentItem() + 1);
day.setCurrentItem(curDay - 1, true);
calendar.set(Calendar.DAY_OF_MONTH, curDay);
//calendar.set(Calendar.DAY_OF_MONTH, day.getCurrentItem()+1);
Log.i("Calendar",calendar+"");
Long milliCalendar = calendar.getTimeInMillis();
Calendar currentCalendar = Calendar.getInstance();
Long millicurrentCalendar = currentCalendar.getTimeInMillis();
if( milliCalendar > millicurrentCalendar){
return currentCalendar;
}
else{
return calendar;
}
}
private class DateNumericAdapter extends NumericWheelAdapter {
int currentItem;
int currentValue;
public DateNumericAdapter(Context context, int minValue, int maxValue,
int current) {
super(context, minValue, maxValue);
this.currentValue = current;
setTextSize(20);
}
@Override
protected void configureTextView(TextView view) {
super.configureTextView(view);
view.setTypeface(null, Typeface.BOLD);
}
@Override
public View getItem(int index, View cachedView, ViewGroup parent) {
currentItem = index;
return super.getItem(index, cachedView, parent);
}
}
private class DateArrayAdapter extends ArrayWheelAdapter<String> {
int currentItem;
int currentValue;
public DateArrayAdapter(Context context, String[] items, int current) {
super(context, items);
this.currentValue = current;
setTextSize(23);
}
@Override
protected void configureTextView(TextView view) {
super.configureTextView(view);
if (currentItem == currentValue) {
}
view.setTypeface(null, Typeface.BOLD);
}
@Override
public View getItem(int index, View cachedView, ViewGroup parent) {
currentItem = index;
return super.getItem(index, cachedView, parent);
}
}
public interface DatePickerListner {
public void OnDoneButton(Dialog datedialog, Calendar c);
public void OnCancelButton(Dialog datedialog);
}
}
答案 0 :(得分：0)
这里的罪魁祸首是
Calendar cal = Calendar.getInstance();
我使用Joda Time而不是标准java.util.Calendar / date
解决了这个问题GregorianChronology calendar = GregorianChronology.getInstance();
DateTimeField field = calendar.dayOfMonth();
LocalDate date = new LocalDate(mYear, mMonth+1, 1, calendar);
int max = field.getMaximumValue(date);