如何创建微调，显示当前及未来30日期 [英] How to create Spinner to show current and next 30 dates
本文介绍了如何创建微调，显示当前及未来30日期的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我怎样才能创建一个日期微调，这说明在当前的EditText日期为微调默认和将来的日期（如，未来30天）
我用日期选取器在许多应用程序，所以我很熟悉日期选取器对话，但没有关于日期的微调任何想法。
注意结果
请不要告诉我如何风格的EditText为微调
编辑：1 所推荐的 @erakitin
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_date）; 微调spinnerDateIn =（微调）findViewById（R.id.spinnerDateIn）;
微调spinnerDateOut =（微调）findViewById（R.id.spinnerDateOut）; spinnerDateIn.setAdapter（新CalendarSpinnerAdapter（SpinnerDateActivity.this，30））;}
编辑：2 所推荐的 @erakitin 在新的更新
CalendarSpinnerAdapter mSpinnerDateInAdapter =新CalendarSpinnerAdapter（SpinnerDateActivity.this，30）;
spinnerDate.setAdapter（mSpinnerDateInAdapter）; spinnerDate.setOnItemSelectedListener（新AdapterView.OnItemSelectedListener（）{
@覆盖
公共无效onItemSelected（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{
spinnerDate.setSelection（位置）;
} @覆盖
公共无效onNothingSelected（适配器视图＆LT;＆GT;母公司）{ }
}）;
现在，试图让字符串选定项的值，但得到：<？code>的java.util.GregorianCalendar ，其中我在做什么错误
strDate = spinnerDate.getSelectedItem（）的toString（）;
解决方案
有转接头供微调下面一个简单的例子。
公共类CalendarSpinnerAdapter延伸BaseAdapter { 私人SimpleDateFormat的mDateFormat =新的SimpleDateFormat（D MMM YYYY）; 私人LayoutInflater mInflater;
私人日历mCalendar;
私人诠释mDayCount;
私人INT mLastRequestedDay = 0; 公共CalendarSpinnerAdapter（上下文的背景下，诠释DAYCOUNT）{
mInflater = LayoutInflater.from（上下文）;
mDayCount = DAYCOUNT;
mCalendar = Calendar.getInstance（）;
} @覆盖
公众诠释的getCount（）{
返回mDayCount;
} @覆盖
公共日历的getItem（INT位置）{
mCalendar.add（Calendar.DAY_OF_YEAR，位置 - mLastRequestedDay）;
mLastRequestedDay =位置;
返回mCalendar;
} @覆盖
众长getItemId（INT位置）{
返回的位置;
} @覆盖
公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
如果（convertView == NULL）{
convertView = mInflater.inflate（android.R.layout.simple_spinner_dropdown_item，父母，假）;
} 日历项目=的getItem（位置）;
（（的TextView）convertView）.setText（mDateFormat.format（item.getTimeInMillis（）））; 返回convertView;
} @覆盖
公共查看getDropDownView（INT位置，查看convertView，父母的ViewGroup）{
返回getView（位置，convertView，父母）;
}
}
如何用它来显示当前的日期和下次29天：
mDateSpinner.setAdapter（新CalendarSpinnerAdapter（getActivity（），30））;
UPD：
我们应该在参数添加到适配器的构造函数来设置起始日期：
公共CalendarSpinnerAdapter（上下文的背景下，日历的startDate，诠释DAYCOUNT）{
mInflater = LayoutInflater.from（上下文）;
mDayCount = DAYCOUNT;
mCalendar = Calendar.getInstance（）;
mCalendar.setTimeInMillis（startDate.getTimeInMillis（））;
}
那么关于 spinnerDateIn 添加监听器，我们可以初始化第二微调：
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_date）; 微调spinnerDateIn =（微调）findViewById（R.id.spinnerDateIn）;
最后的微调spinnerDateOut =（微调）findViewById（R.id.spinnerDateOut）; mSpinnerDateInAdapter =新CalendarSpinnerAdapter（SpinnerDateActivity.this，Calendar.getInstance（），30）;
spinnerDateIn.setAdapter（mSpinnerDateInAdapter）; spinnerDateIn.setOnItemSelectedListener（新AdapterView.OnItemSelectedListener（）{
@覆盖
公共无效onItemSelected（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{
日历dateIn = Calendar.getInstance（）;
dateIn.setTimeInMillis（mSpinnerDateInAdapter.getItem（位置）.getTimeInMillis（））;
dateIn.add（Calendar.DAY_OF_YEAR，1）; //添加1天
mSpinnerDateOutAdapter =新CalendarSpinnerAdapter（SpinnerDateActivity.this，dateIn，30）;
spinnerDateOut.setAdapter（mSpinnerDateOutAdapter）;
} @覆盖
公共无效onNothingSelected（适配器视图＆LT;＆GT;母公司）{ }
}）;
}
我没有尝试这个code，但它应该工作。
UPD2：
spinnerDate.setSelection（位置）收益日历类的实例。如果你想获得选定的日期为字符串你应该格式化。尝试使用下面的方法：
私人字符串getSelectedDateAsString（微调dateSpinner）{
日历selectedDate =（日历）dateSpinner.getSelectedItem（）;
返回新的SimpleDateFormat（D MMM YYYY）格式（selectedDate.getTimeInMillis（））。
}
How can I create a date Spinner, which shows current date in EditText as default and future dates in Spinner (like, for next 30 days)
I used date picker in many apps, so I am familiar with date picker dialog but don't have any idea about date spinner.
Note
Please don't tell me How to style EditText as Spinner
EDITED: 1 AS RECOMMENDED BY @erakitin
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_date);
Spinner spinnerDateIn = (Spinner) findViewById(R.id.spinnerDateIn);
Spinner spinnerDateOut = (Spinner) findViewById(R.id.spinnerDateOut);
spinnerDateIn.setAdapter(new CalendarSpinnerAdapter(SpinnerDateActivity.this, 30));
}
EDITED: 2 AS RECOMMENDED BY @erakitin in new update
CalendarSpinnerAdapter mSpinnerDateInAdapter = new CalendarSpinnerAdapter(SpinnerDateActivity.this, 30);
spinnerDate.setAdapter(mSpinnerDateInAdapter);
spinnerDate.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
spinnerDate.setSelection(position);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
Now, trying to get value of selected Item in String but getting: java.util.GregorianCalendar, where i am doing mistake ?
strDate = spinnerDate.getSelectedItem().toString();
解决方案
There are a simple example of adapter for Spinner below.
public class CalendarSpinnerAdapter extends BaseAdapter {
private SimpleDateFormat mDateFormat = new SimpleDateFormat("d MMM yyyy");
private LayoutInflater mInflater;
private Calendar mCalendar;
private int mDayCount;
private int mLastRequestedDay = 0;
public CalendarSpinnerAdapter(Context context, int dayCount) {
mInflater = LayoutInflater.from(context);
mDayCount = dayCount;
mCalendar = Calendar.getInstance();
}
@Override
public int getCount() {
return mDayCount;
}
@Override
public Calendar getItem(int position) {
mCalendar.add(Calendar.DAY_OF_YEAR, position - mLastRequestedDay);
mLastRequestedDay = position;
return mCalendar;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = mInflater.inflate(android.R.layout.simple_spinner_dropdown_item, parent, false);
}
Calendar item = getItem(position);
((TextView) convertView).setText(mDateFormat.format(item.getTimeInMillis()));
return convertView;
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
return getView(position, convertView, parent);
}
}
How to use it for display current date and next 29 days:
mDateSpinner.setAdapter(new CalendarSpinnerAdapter(getActivity(), 30));
UPD:
We should add a parameter to adapter's constructor for setting the starting date:
public CalendarSpinnerAdapter(Context context, Calendar startDate, int dayCount) {
mInflater = LayoutInflater.from(context);
mDayCount = dayCount;
mCalendar = Calendar.getInstance();
mCalendar.setTimeInMillis(startDate.getTimeInMillis());
}
Then add listener for spinnerDateIn where we can initialize the second spinner:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_date);
Spinner spinnerDateIn = (Spinner) findViewById(R.id.spinnerDateIn);
final Spinner spinnerDateOut = (Spinner) findViewById(R.id.spinnerDateOut);
mSpinnerDateInAdapter = new CalendarSpinnerAdapter(SpinnerDateActivity.this, Calendar.getInstance(), 30);
spinnerDateIn.setAdapter(mSpinnerDateInAdapter);
spinnerDateIn.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Calendar dateIn = Calendar.getInstance();
dateIn.setTimeInMillis(mSpinnerDateInAdapter.getItem(position).getTimeInMillis());
dateIn.add(Calendar.DAY_OF_YEAR, 1); // add one day
mSpinnerDateOutAdapter = new CalendarSpinnerAdapter(SpinnerDateActivity.this, dateIn, 30);
spinnerDateOut.setAdapter(mSpinnerDateOutAdapter);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
I didn't try this code but it should work.
UPD2:
spinnerDate.setSelection(position) returns Calendar class instance. If you want to get selected date as String you should format it. Try to use following method:
private String getSelectedDateAsString(Spinner dateSpinner) {
Calendar selectedDate = (Calendar) dateSpinner.getSelectedItem();
return new SimpleDateFormat("d MMM yyyy").format(selectedDate.getTimeInMillis());
}
这篇关于如何创建微调，显示当前及未来30日期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！
查看全文
