在我的应用中，我需要显示日历。由于日历视图可从API级别11获得，因此，我使用了网格视图。 Basically, I follwed this tutorial。日历正在运行，但日历中的数据显示延迟，意味着，当我点击按钮显示日历时，它会在延迟大约5-10秒后出现。我甚至测试了禁用日志，我把它放在程序中，但它没有任何区别。我在下面发布我的代码。
日历适配器
public class CalendarAdapter extends BaseAdapter //implements OnClickListener
{
static final int FIRST_DAY_OF_WEEK = 0; // Sunday = 0, Monday = 1
private Context mContext;
private Calendar month;
private Calendar selectedDate;
public String[] days;
TextView txtCurMonth;
public static final String TAG = "CalendarAdapter";
int curYear, curMonth;
public ArrayList<EventDetailDAO> mEventDAOList;
String date, dateToHighlight;
public static boolean calendarItemClicked = false;
ViewHolder holder;
public CalendarAdapter(Context c, Calendar monthCalendar, TextView txtCurMonth)
{
month = monthCalendar;
selectedDate = (Calendar)monthCalendar.clone();
mContext = c;
month.set(Calendar.DAY_OF_MONTH, 1);
new ArrayList<String>();
this.txtCurMonth = txtCurMonth;
mEventDAOList = new ArrayList<EventDetailDAO>();
curYear = selectedDate.get(Calendar.YEAR);
curMonth = selectedDate.get(Calendar.MONTH) + 1;
refreshDays();
}//Constructor
public void setItems(ArrayList<String> items)
{
for(int i = 0; i != items.size(); i++)
{
if(items.get(i).length() == 1)
{
items.set(i, "0" + items.get(i));
}//if
}//for
}//setItems
public int getCount()
{
return days.length;
}//getCount
public Object getItem(int position)
{
return null;
}//getItem
public long getItemId(int position)
{
return 0;
}//getItemId
// create a new view for each item referenced by the Adapter
public View getView(final int position, View convertView, ViewGroup parent)
{
if (convertView == null)
{
holder = new ViewHolder();
convertView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.calendar_grid_adapter, null);
holder.linCalAdapParent = (LinearLayout)convertView
.findViewById(R.id.linCalAdapParent);
holder.dayView = (TextView)convertView.findViewById(R.id.date);
convertView.setTag(holder);
}//if
else
{
holder = (ViewHolder)convertView.getTag();
}//else
Typeface date_TF = Typeface.createFromAsset(mContext.getAssets(), "fonts/arial.ttf");
txtCurMonth.setTypeface(date_TF);
txtCurMonth.setText(DateFormat.format("MMMM yyyy", month.getTime()));
holder.dayView.setTypeface(date_TF);
holder.dayView.setText(days[position]);
if(days[position].equals(""))
{
holder.linCalAdapParent.setBackgroundResource(R.drawable.calendar_tile);
}//if
else
{
String monthToCheck = null;
if(curMonth < 10)
{
monthToCheck = "0"+curMonth;
}//if
else
{
monthToCheck = Integer.toString(curMonth);
}//else
dateToHighlight = curYear+"-"+monthToCheck;
Log.v(TAG, "date to highlight: "+dateToHighlight);
if(isEnabled(position))
{
holder.linCalAdapParent.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
Log.v(TAG, "CalendarAdapter mEventDAOList size: "+mEventDAOList.size());
String daysToMatch = days[position];
if(daysToMatch.length() == 1)
{
daysToMatch = "0"+daysToMatch;
}//if
Log.v(TAG, "CalendarAdapter day selected: "+daysToMatch);
ArrayList<EventDetailDAO> mSelectedEventDAOList
= new ArrayList<EventDetailDAO>();
for(int i = 0; i < mEventDAOList.size(); i++)
{
if(mEventDAOList.get(i).getEvent_Date().contains(daysToMatch))
{
mSelectedEventDAOList.add(mEventDAOList.get(i));
selectedDate.set(Calendar.YEAR, curYear);
selectedDate.set(Calendar.MONTH, curMonth - 1);
selectedDate.set(Calendar.DAY_OF_MONTH, Integer.parseInt(daysToMatch));
}//if
}//for
((EventsActivity)mContext).getDataFromCalendar(mSelectedEventDAOList, selectedDate);
((EventsActivity)mContext).calInstanceFromAdapter = selectedDate;
calendarItemClicked = true;
}//onClick
});
}//if
}//else
Log.v(TAG, "Calendar adapter getView called");
return convertView;
}//getView
public void refreshDays()
{
// clear items
//items.clear();
int lastDay = month.getActualMaximum(Calendar.DAY_OF_MONTH);
int firstDay = (int)month.get(Calendar.DAY_OF_WEEK);
Log.v(TAG, "in refreshDays, lastDay: "+lastDay);
Log.v(TAG, "in refreshDays, firstDay: "+firstDay);
// figure size of the array
if(firstDay == 1)
{
Log.v(TAG, "if first day 1");
days = new String[lastDay + (FIRST_DAY_OF_WEEK * 6)];
}//if
else
{
Log.v(TAG, "else first day not 1");
days = new String[lastDay + firstDay - (FIRST_DAY_OF_WEEK + 1)];
}//else
int j=FIRST_DAY_OF_WEEK;
// populate empty days before first real day
if(firstDay > 1)
{
Log.v(TAG, "if first day > 1");
for(j = 0; j < firstDay - FIRST_DAY_OF_WEEK; j++)
{
Log.v(TAG, "in for if first day > 1");
days[j] = "";
}//for
}//if
else
{
Log.v(TAG, "else first day < 1");
for(j = 0; j < FIRST_DAY_OF_WEEK * 6; j++)
{
Log.v(TAG, "in for else first day < 1");
days[j] = "";
}//for
j = FIRST_DAY_OF_WEEK * 6 + 1; // sunday => 1, monday => 7
}//else
// populate days
int dayNumber = 1;
for(int i = j - 1; i < days.length; i++)
{
Log.v(TAG, "in for day number");
days[i] = "" + dayNumber;
dayNumber++;
}//for
}//refreshDays
@Override
public boolean isEnabled(int position)
{
date = days[position];
if(date.length() == 1)
{
date = "0"+date;
}//if
dateToHighlight = dateToHighlight+"-"+date;
for(EventDetailDAO mEventDetailDAO: GetEventDetailAsyncTask.mainEventDetailArrayList)
{
Log.v(TAG, "CalendarAdapter isEnabled dateToHighlight: "+dateToHighlight);
if(mEventDetailDAO.getEvent_Date().equals(dateToHighlight))
{
mEventDAOList.add(mEventDetailDAO);
holder.linCalAdapParent.setBackgroundResource(R.drawable.calendar_tile_sel);
return true;
}//if
}//for
return false;
}//isEnabled
class ViewHolder
{
LinearLayout linCalAdapParent;
TextView dayView;
}//ViewHolder
}//CalendarAdapter
在我的日历中，我必须突出显示某些事件的日期。并且，点击突出显示的日期，它将显示该日期的事件列表。每件事都有效。除非日历出现延迟，即使我更改了月份。我没有得到原因。
答案 0 :(得分：1)
延迟的可能原因之一可能是调用每个小区调用的Typeface.createFromAsset()。 createFromAsset()方法消耗了大量资源。
为了缓解这种情况，您可以创建一个保留所用字体的单例类，因此每次都不会从字体文件生成字体。或者在onCreate（）中初始化它并将其作为参数传递给CalendarAdapter构造函数，然后在getView()中使用该实例。
（要测试此假设，请注释将字体设置为txtCurMonth TextView的行，并查看是否存在差异）