java– 如何创建Spinner以显示当前和接下来的30个日期

概述如何创建日期微调器,它将EditText中的当前日期显示为Spinner中的默认日期和未来日期(例如,接下来的30天)我在许多应用程序中使用了日期选择器,所以我熟悉日期选择器对话框,但对日期微调器没有任何想法.注意请不要告诉我如何将EditText设置为Spinner的样式编辑：1@erakitin推荐

如何创建日期微调器,它将EditText中的当前日期显示为Spinner中的默认日期和未来日期(例如,接下来的30天)

我在许多应用程序中使用了日期选择器,所以我熟悉日期选择器对话框,但对日期微调器没有任何想法.

注意
请不要告诉我如何将EditText设置为Spinner的样式

编辑：1 @erakitin推荐

@OverrIDeprotected 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));         }

编辑：2 @erakitin在新的更新中推荐

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) {            }        });

现在,尝试获取String中所选Item的值,但得到：java.util.GregorianCalendar,我在哪里做错了？

strDate = spinnerDate.getSelectedItem().toString();

解决方法:

下面有一个适用于Spinner的简单适配器示例.

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);    }}

如何使用它来显示当前日期和接下来的29天：

mDateSpinner.setAdapter(new CalendarSpinnerAdapter(getActivity(), 30));

UPD：

我们应该在adapter的构造函数中添加一个参数来设置开始日期：

public CalendarSpinnerAdapter(Context context, Calendar startDate, int dayCount) {    mInflater = LayoutInflater.from(context);    mDayCount = dayCount;    mCalendar = Calendar.getInstance();    mCalendar.setTimeInMillis(startDate.getTimeInMillis());}

然后为spinnerDateIn添加监听器,我们可以在其中初始化第二个微调器：

@OverrIDeprotected 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) {        }    });}

我没有尝试这个代码,但它应该工作.

UPD2：

spinnerDate.setSelection(position)返回Calendar类实例.如果要将选定日期作为String,则应格式化它.尝试使用以下方法：

private String getSelectedDateAsstring(Spinner dateSpinner) {    Calendar selectedDate = (Calendar) dateSpinner.getSelectedItem();    return new SimpleDateFormat("d MMM yyyy").format(selectedDate.getTimeInMillis());}

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