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我有一个日历，我需要去6个月，而不是6个月转发，并且在6个月前有点麻烦。我如何让这个日历从当前月份开始回溯6个月，然后滚动到过去6个月？带月份标题（Google HeaderView）的日历（GridView）
另外，我正在使用Google HeaderView来显示日历的gridview的headerview。如何在每个月结束后添加空白空间以便能够在该区域放置当月的标题？ Google HeaderView似乎只在GridView的开始处填充一次。
public class CalendarAt;ctivity extends Activity implements AppCompatCallback {
private AppCompatDelegate delegate;
Toolbar mToolbar;
private HeaderGridView mGridView;
private TextView mHeaderTextView;
private LinearLayout calendar_view_header;
private ImageView mCalendarButtonClicked, mCalendarButton, settingsBtn, settingsBtnChecked;
private PopupWindow mPopUp;
//default 6 months +- half a day
private static final int DAYS_COUNT = 182;
// current displayed month
private Calendar currentDate = Calendar.getInstance();
private EventListener eventListener = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
HashSet<Date> events = new HashSet<>();
events.add(new Date());
//Show Toolbar without extending AppCompatActivity
delegate = AppCompatDelegate.create(this, this);
delegate.onCreate(savedInstanceState);
delegate.setContentView(R.layout.calendar_main);
delegate.setSupportActionBar(mToolbar);
mGridView = (HeaderGridView) findViewById(R.id.calendar_grid);
settingsBtn = (ImageView) findViewById(R.id.settingsBtn);
settingsBtnChecked = (ImageView) findViewById(R.id.settingsBtnClicked);
mCalendarButton = (ImageView) findViewById(R.id.eReceiptSearchBtn);
mCalendarButton.setVisibility(View.GONE);
mCalendarButtonClicked = (ImageView) findViewById(R.id.eReceiptSearchBtnClicked);
calendar_view_header = (LinearLayout) findViewById(R.id.calendar_view_header);
mCalendarButtonClicked.setVisibility(View.VISIBLE);
updateCalendar();
mCalendarButtonClicked.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(getApplicationContext(), MainActivity.class));
}
});
settingsBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showPreferencesPopup();
mCalendarButtonClicked.setVisibility(View.GONE);
mCalendarButton.setVisibility(View.VISIBLE);
}
});
mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Replace with just EReceipts for the specific date which was clicked on
startActivity(new Intent(getApplicationContext(), MainActivity.class));
}
});
}
public void updateCalendar() {
updateCalendar(null);
}
private void updateCalendar(HashSet<Date> events) {
Calendar calendar = (Calendar) currentDate.clone();
int monthBeginningCell = calendar.get(Calendar.DAY_OF_WEEK) - 1;
ArrayList<Date> cells = new ArrayList<>();
calendar.add(Calendar.DAY_OF_MONTH, -monthBeginningCell);
while (cells.size() < DAYS_COUNT) {
cells.add(calendar.getTime());
calendar.add(Calendar.DAY_OF_MONTH, 1);
calendar.set(Calendar.MONTH, 6);
}
String monthname=(String)android.text.format.DateFormat.format("MMMM", new Date());
String year = (String)android.text.format.DateFormat.format("yyyy", new Date());
Log.i("HERE", "updateCalendar: " + monthname + " " + year);
View headerView = getLayoutInflater().inflate(R.layout.calendar_view_header, null);
mGridView.addHeaderView(headerView);
mGridView.setAdapter(new CalendarAdapter(getApplicationContext(), cells, events));
}
@Override
public void onSupportActionModeStarted(ActionMode mode) {
}
@Override
public void onSupportActionModeFinished(ActionMode mode) {
}
@Nullable
@Override
public ActionMode onWindowStartingSupportActionMode(ActionMode.Callback callback) {
return null;
}
private class CalendarAdapter extends ArrayAdapter<Date> {
private HashSet<Date> eventDays;
private LayoutInflater inflater;
public CalendarAdapter(Context context, ArrayList<Date> days, HashSet<Date> eventDays) {
super(context, R.layout.control_calendar_day, days);
this.eventDays = eventDays;
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View view, ViewGroup parent) {
Date date = getItem(position);
int day = date.getDate();
int month = date.getMonth();
int year = date.getYear();
String fullDate;
if (view == null) {
view = inflater.inflate(R.layout.control_calendar_day, parent, false);
view.setBackgroundResource(0);
if (eventDays != null) {
for (Date eventDate : eventDays) {
if (eventDate.getDate() == day && eventDate.getMonth() == month &&
eventDate.getYear() == year) {
view.setBackgroundResource(R.color.colorBlack);
((TextView) view).setTypeface(null, Typeface.BOLD);
break;
}
}
}
if(day == Calendar.getInstance().getActualMaximum(Calendar.DAY_OF_MONTH)) {
Log.i("ADAM", "getView: " + day);
}
}
((TextView) view).setText(String.valueOf(date.getDate()));
return view;
}
}
public void setEventListener(EventListener eventListener) {
this.eventListener = eventListener;
}
public interface EventListener {
void onDayLongPress(Date date);
}
private void showPreferencesPopup() {
LayoutInflater mInflater = (LayoutInflater) CalendarActivity.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View mPopUpLayout = mInflater.inflate(R.layout.settings_btn_click,
(ViewGroup) findViewById(R.id.eReceiptsSettingsPopUp));
mPopUp = new PopupWindow(mPopUpLayout, FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.WRAP_CONTENT, true);
settingsBtn.setVisibility(View.GONE);
settingsBtnChecked.setVisibility(View.VISIBLE);
mPopUp.setOutsideTouchable(true);
mPopUp.showAsDropDown(settingsBtn, 0, 0);
mPopUp.setOnDismissListener(new PopupWindow.OnDismissListener() {
@Override
public void onDismiss() {
mPopUp.dismiss();
settingsBtn.setVisibility(View.VISIBLE);
settingsBtnChecked.setVisibility(View.GONE);
}
});
}
}