我的 DatePickerDailog 显示日期从今天到 50 年后。但我试图将显示日期从今天到过去 50 年。经过几次尝试我失败了，所以我把我的代码放在这里。它应该显示人们的出生日期，所以没有人可以在今天出生并在电脑上打字。
公共类 DatePickerDailog 扩展对话框 {
private Context Mcontex;
private int NoOfYear = 50;
LayoutParams params_cancel;
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);
lytbutton.setBackgroundResource(R.drawable.bl_button);
params_cancel= new LayoutParams(
android.view.ViewGroup.LayoutParams.FILL_PARENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 0.8f);
lytbutton.setBackgroundResource(R.drawable.bl_button);
lytdate.setBackgroundResource(R.drawable.bl_button);
lytmain.setBackgroundResource(R.color.white);
Button btnset = new Button(Mcontex);
Button btncancel = new Button(Mcontex);
btncancel.setShadowLayer(2, 1, 1, R.drawable.green_button);
btnset.setShadowLayer(2, 1, 1, R.drawable.green_button);
btnset.setBackgroundResource(R.drawable.green_button);
btncancel.setBackgroundResource(R.drawable.green_button);
btnset.setTextColor(Mcontex.getResources().getColor(R.color.white));
btncancel.setTextColor(Mcontex.getResources().getColor(R.color.white));
btncancel.setTextSize(15);
btnset.setTextSize(15);
btnset.setText("R�gler");
btncancel.setText("D�commander");
btnset.setGravity(Gravity.CENTER);
btncancel.setGravity(Gravity.CENTER);
final WheelView month = new WheelView(Mcontex);
final WheelView year = new WheelView(Mcontex);
final WheelView day = new WheelView(Mcontex);
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);
params_cancel.setMargins(2, 2, 4, 2);
btnset.setLayoutParams(params_cancel);
lytbutton.addView(btnset, params_cancel);
lytbutton.addView(btncancel,params_cancel);
lytbutton.setPadding(5, 5, 5, 5);
lytmain.addView(lytdate);
lytmain.addView(lytbutton);
setContentView(lytmain);
getWindow().setLayout(LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT);
OnWheelChangedListener listener = new OnWheelChangedListener() {
public void onChanged(WheelView wheel, int oldValue, int newValue) {
updateDays(year, month, day);
}
};
// month
int curMonth = calendar.get(Calendar.MONTH);
String months[] = new String[] {"Janvier", "F�vrier", "Mars",
"Avril", "Mai", "Juin", "Juillet", "Ao�t", "Septembre",
"Octobre", "Novembre", "D�cembre" };
month.setViewAdapter(new DateArrayAdapter(context, months, curMonth));
month.setCurrentItem(curMonth);
month.addChangingListener(listener);
Calendar cal = Calendar.getInstance();
// year
int curYear = calendar.get(Calendar.YEAR);
int Year = cal.get(Calendar.YEAR);
year.setViewAdapter(new DateNumericAdapter(context, Year ,
Year + NoOfYear, NoOfYear));
year.setCurrentItem(Year);
year.addChangingListener(listener);
// day
updateDays(year, month, day);
day.setCurrentItem(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,
calendar.get(Calendar.YEAR) + (year.getCurrentItem()));
calendar.set(Calendar.MONTH, month.getCurrentItem());
int maxDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
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);
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(18);
}
@Override
protected void configureTextView(TextView view) {
super.configureTextView(view);
if (currentItem == currentValue) {
view.setTextColor(view.getResources().getColor(R.color.white));
}
view.setTypeface(null, Typeface.BOLD);
view.setTextColor(view.getResources().getColor(R.color.white));
}
@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(18);
}
@Override
protected void configureTextView(TextView view) {
super.configureTextView(view);
if (currentItem == currentValue) {
view.setTextColor(view.getResources().getColor(R.color.white));
}
view.setTypeface(null, Typeface.BOLD);
view.setTextColor(view.getResources().getColor(R.color.white));
}
@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);
}
}
更新：此函数中设置了日期
Calendar updateDays(WheelView year, WheelView month, WheelView day) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR,
calendar.get(Calendar.YEAR) + (year.getCurrentItem()));
calendar.set(Calendar.MONTH, month.getCurrentItem());
int maxDays = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
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);
return calendar;
}