gridview性能问题(gridview performance issue)

gridview性能问题(gridview performance issue)

我有一个自定义日历。 对于月份视图，我使用网格视图。 在日历的每一天，显示每月的日期数和每天的事件数。 为了达到这个目标，我在getView中询问每一天的事件。 为了提高性能，我在get视图中使用了一个holder。 但不幸的是我的应用程序经常崩溃，如果我从一个月切换到下一个月它很慢。 如果用户点击下个月的按钮，则调用setGridCellAdapterToDate。

public void setGridCellAdapterToDate(int month, int year) { adapter = new GridCellAdapter(getActivity().getApplicationContext(), calendarView,R.id.calendar_day_gridcell, month, year); _calendar.set(year, month - 1, _calendar.get(Calendar.DAY_OF_MONTH)); currentMonth.setText(dateFormatter.format(dateTemplate, _calendar.getTime())); adapter.notifyDataSetChanged(); calendarView.setAdapter(adapter); calendarView.setSelected(true); }

有没有办法提高我的日历的性能？

public class GridCellAdapter extends BaseAdapter implements OnClickListener, OnLongClickListener { private static final String tag = "GridCellAdapter"; private final Context _context; private final List<String> list; private static final int DAY_OFFSET = 1; private final String[] weekdays = new String[]{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; private final String[] months = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"}; private final int[] daysOfMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; private final int month, year; private int daysInMonth, prevMonthDays; private int currentDayOfMonth; private int currentWeekDay; private Button gridcell; private TextView num_events_per_day; private final HashMap eventsPerMonthMap; SimpleDateFormat("dd-MMM-yyyy"); public GridCellAdapter(Context context, GridView gv, int textViewResourceId, int month, int year) { super(); this._context = context; this.list = new ArrayList<String>(); this.month = month; this.year = year; this.mGv = gv; Log.d(tag, "==> Passed in Date FOR Month: " + month + " " + "Year: " + year); Calendar calendar = Calendar.getInstance(); setCurrentDayOfMonth(calendar.get(Calendar.DAY_OF_MONTH)); setCurrentWeekDay(calendar.get(Calendar.DAY_OF_WEEK)); Log.d(tag, "New Calendar:= " + calendar.getTime().toString()); Log.d(tag, "CurrentDayOfWeek :" + getCurrentWeekDay()); Log.d(tag, "CurrentDayOfMonth :" + getCurrentDayOfMonth()); // Print Month printMonth(month, year); // Find Number of Events eventsPerMonthMap = findNumberOfEventsPerMonth(year, month); } private String getMonthAsString(int i) { return months[i]; } private String getWeekDayAsString(int i) { return weekdays[i]; } private int getNumberOfDaysOfMonth(int i) { return daysOfMonth[i]; } public String getItem(int position) { return list.get(position); } public int getCount() { return list.size(); } /** * Prints Month * * @param mm * @param yy */ private void printMonth(int mm, int yy) { Log.d(tag, "==> printMonth: mm: " + mm + " " + "yy: " + yy); // The number of days to leave blank at // the start of this month. int trailingSpaces = 0; int leadSpaces = 0; int daysInPrevMonth = 0; int prevMonth = 0; int prevYear = 0; int nextMonth = 0; int nextYear = 0; int currentMonth = mm - 1; String currentMonthName = getMonthAsString(currentMonth); daysInMonth = getNumberOfDaysOfMonth(currentMonth); Log.d(tag, "Current Month: " + " " + currentMonthName + " having " + daysInMonth + " days."); // Gregorian Calendar : MINUS 1, set to FIRST OF MONTH GregorianCalendar cal = new GregorianCalendar(yy, currentMonth, 1); Log.d(tag, "Gregorian Calendar:= " + cal.getTime().toString()); Calendar caltemp = Calendar.getInstance(); Integer intMonat = caltemp.get(Calendar.MONTH); if (currentMonth == 11) { prevMonth = currentMonth - 1; daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth); nextMonth = 0; prevYear = yy; nextYear = yy + 1; Log.d(tag, "*->PrevYear: " + prevYear + " PrevMonth:" + prevMonth + " NextMonth: " + nextMonth + " NextYear: " + nextYear); } else if (currentMonth == 0) { prevMonth = 11; prevYear = yy - 1; nextYear = yy; daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth); nextMonth = 1; Log.d(tag, "**--> PrevYear: " + prevYear + " PrevMonth:" + prevMonth + " NextMonth: " + nextMonth + " NextYear: " + nextYear); } else { prevMonth = currentMonth - 1; nextMonth = currentMonth + 1; nextYear = yy; prevYear = yy; daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth); Log.d(tag, "***---> PrevYear: " + prevYear + " PrevMonth:" + prevMonth + " NextMonth: " + nextMonth + " NextYear: " + nextYear); } // Compute how much to leave before before the first day of the // month. // getDay() returns 0 for Sunday. int currentWeekDay = cal.get(Calendar.DAY_OF_WEEK) - 1; trailingSpaces = currentWeekDay; Log.d(tag, "Week Day:" + currentWeekDay + " is " + getWeekDayAsString(currentWeekDay)); Log.d(tag, "No. Trailing space to Add: " + trailingSpaces); Log.d(tag, "No. of Days in Previous Month: " + daysInPrevMonth); if (cal.isLeapYear(cal.get(Calendar.YEAR)) && mm == 1) { ++daysInMonth; } // Trailing Month days for (int i = 0; i < trailingSpaces; i++) { Log.d(tag, "PREV MONTH:= " + prevMonth + " => " + getMonthAsString(prevMonth) + " " + String.valueOf((daysInPrevMonth - trailingSpaces + DAY_OFFSET) + i)); list.add(String.valueOf((daysInPrevMonth - trailingSpaces + DAY_OFFSET) + i) + "-GREY" + "-" + getMonthAsString(prevMonth) + "-" + prevYear); } // Current Month Days for (int i = 1; i <= daysInMonth; i++) { Log.d(currentMonthName, String.valueOf(i) + " " + getMonthAsString(currentMonth) + " " + yy); if (i == getCurrentDayOfMonth() && mm == intMonat+1) { list.add(String.valueOf(i) + "-BLUE" + "-" + getMonthAsString(currentMonth) + "-" + yy); } else { list.add(String.valueOf(i) + "-WHITE" + "-" + getMonthAsString(currentMonth) + "-" + yy); } } // Leading Month days for (int i = 0; i < list.size() % 7; i++) { Log.d(tag, "NEXT MONTH:= " + getMonthAsString(nextMonth)); list.add(String.valueOf(i + 1) + "-GREY" + "-" + getMonthAsString(nextMonth) + "-" + nextYear); } } /** * NOTE: YOU NEED TO IMPLEMENT THIS PART Given the YEAR, MONTH, retrieve * ALL entries from a SQLite database for that month. Iterate over the * List of All entries, and get the dateCreated, which is converted into * day. * * @param year * @param month * @return */ private HashMap findNumberOfEventsPerMonth(int year, int month) { HashMap map = new HashMap<String, Integer>(); // DateFormat dateFormatter2 = new DateFormat(); // // String day = dateFormatter2.format("dd", dateCreated).toString(); // // if (map.containsKey(day)) // { // Integer val = (Integer) map.get(day) + 1; // map.put(day, val); // } // else // { // map.put(day, 1); // } return map; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; Integer intRowNumber = 5; View row = convertView; if (row == null) { LayoutInflater inflater = (LayoutInflater) _context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); row = inflater.inflate(R.layout.calendar_day_gridcell, parent, false); //convertView = inflater.inflate(R.layout.calendar_day_gridcell,parent,false); holder = new ViewHolder(); holder.text = (TextView)row.findViewById(R.id.num_events_per_day); holder.gridcell= (Button)row.findViewById(R.id.calendar_day_gridcell); //holder.EventsofMonth = openCalendar.getEventsOfMonth(getActivity(), caltemp.getTimeInMillis(),strCalendarId); row.setTag(holder); } else { holder = (ViewHolder)row.getTag(); } int intHeight = mGv.getHeight(); intHeight = intHeight/intRowNumber; AbsListView.LayoutParams param = new AbsListView.LayoutParams( android.view.ViewGroup.LayoutParams.FILL_PARENT, mGv.getHeight()/intRowNumber); //row.setLayoutParams(param); row.setLayoutParams(param); // Get a reference to the Day gridcell //gridcell = (Button) row.findViewById(R.id.calendar_day_gridcell); //gridcell.setOnClickListener(new MyOnClickListener(position)); holder.gridcell.setOnClickListener(this); holder.gridcell.setOnLongClickListener(this); // ACCOUNT FOR SPACING Log.d(tag, "Current Day: " + getCurrentDayOfMonth()); String[] day_color = list.get(position).split("-"); String theday = day_color[0]; String themonth = day_color[2]; String theyear = day_color[3]; String selection = "((" + CalendarContract.Events.DTSTART + " >= ?) AND (" + CalendarContract.Events.DTEND + " <= ?) AND (" + CalendarContract.Events.DELETED + " = ?) AND (" + CalendarContract.Events.CALENDAR_ID + " = ?))"; if ((!eventsPerMonthMap.isEmpty()) && (eventsPerMonthMap != null)) { if (eventsPerMonthMap.containsKey(theday)) { //num_events_per_day = (TextView) row.findViewById(R.id.num_events_per_day); Integer numEvents = (Integer) eventsPerMonthMap.get(theday); //num_events_per_day.setText(numEvents.toString()); } } // Set the Day GridCell holder.gridcell.setText(theday); holder.gridcell.setTag(theday + "-" + themonth + "-" + theyear); Log.d(tag, "Setting GridCell " + theday + "-" + themonth + "-" + theyear); if (day_color[1].equals("GREY")) { holder.gridcell.setTextColor(Color.LTGRAY); } if (day_color[1].equals("WHITE")) { holder.gridcell.setTextColor(Color.WHITE); } if (day_color[1].equals("BLUE")) { //gridcell.setTextColor(getResources().getColor(R.color.static_text_color)); holder.gridcell.setTextColor(Color.BLUE); DisplayMetrics metrics; metrics = getActivity().getApplicationContext().getResources().getDisplayMetrics(); float Textsize = 0; Textsize = holder.gridcell.getTextSize()/metrics.density; holder.gridcell.setTextSize(Textsize+4); } //ermittle die Anzahl der Events an diesem Tag und schreibe sie in num_events_per_day Integer intAnzEventsonSelectedDay = 0; //num_events_per_day = (TextView) row.findViewById(R.id.num_events_per_day); String strCurrentDatum = theday + "-" + month + "-" + year; SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy"); Date dateObj = null; try { dateObj = sdf.parse(strCurrentDatum); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } String temp = dateObj.toString(); caltemp.setTime(dateObj); Cursor curCalendar = openCalendar.getEventsOfDay(getActivity(), caltemp.getTimeInMillis(),strCalendarId); curCalendar.moveToFirst(); intAnzEventsonSelectedDay = curCalendar.getCount(); if (intAnzEventsonSelectedDay > 4){ holder.text.setTextColor(Color.RED); } else{ // } holder.text.setText(intAnzEventsonSelectedDay.toString()); return row; }

I have a custom calendar. For its month view I use grid view. On each day of the calendar the number of day of month and the number of events on each day are shown. To reach that goal I ask for the events of each day in getView. To increase performance I use an holder within get view. But unfortunately my app crashes quite often and if I switch from one month to the next it is very slow. If the user clicks on a button for next month setGridCellAdapterToDate is called.

public void setGridCellAdapterToDate(int month, int year) { adapter = new GridCellAdapter(getActivity().getApplicationContext(), calendarView,R.id.calendar_day_gridcell, month, year); _calendar.set(year, month - 1, _calendar.get(Calendar.DAY_OF_MONTH)); currentMonth.setText(dateFormatter.format(dateTemplate, _calendar.getTime())); adapter.notifyDataSetChanged(); calendarView.setAdapter(adapter); calendarView.setSelected(true); }

Is there a way to increase the performance of my calendar?

public class GridCellAdapter extends BaseAdapter implements OnClickListener, OnLongClickListener { private static final String tag = "GridCellAdapter"; private final Context _context; private final List<String> list; private static final int DAY_OFFSET = 1; private final String[] weekdays = new String[]{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; private final String[] months = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"}; private final int[] daysOfMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; private final int month, year; private int daysInMonth, prevMonthDays; private int currentDayOfMonth; private int currentWeekDay; private Button gridcell; private TextView num_events_per_day; private final HashMap eventsPerMonthMap; SimpleDateFormat("dd-MMM-yyyy"); public GridCellAdapter(Context context, GridView gv, int textViewResourceId, int month, int year) { super(); this._context = context; this.list = new ArrayList<String>(); this.month = month; this.year = year; this.mGv = gv; Log.d(tag, "==> Passed in Date FOR Month: " + month + " " + "Year: " + year); Calendar calendar = Calendar.getInstance(); setCurrentDayOfMonth(calendar.get(Calendar.DAY_OF_MONTH)); setCurrentWeekDay(calendar.get(Calendar.DAY_OF_WEEK)); Log.d(tag, "New Calendar:= " + calendar.getTime().toString()); Log.d(tag, "CurrentDayOfWeek :" + getCurrentWeekDay()); Log.d(tag, "CurrentDayOfMonth :" + getCurrentDayOfMonth()); // Print Month printMonth(month, year); // Find Number of Events eventsPerMonthMap = findNumberOfEventsPerMonth(year, month); } private String getMonthAsString(int i) { return months[i]; } private String getWeekDayAsString(int i) { return weekdays[i]; } private int getNumberOfDaysOfMonth(int i) { return daysOfMonth[i]; } public String getItem(int position) { return list.get(position); } public int getCount() { return list.size(); } /** * Prints Month * * @param mm * @param yy */ private void printMonth(int mm, int yy) { Log.d(tag, "==> printMonth: mm: " + mm + " " + "yy: " + yy); // The number of days to leave blank at // the start of this month. int trailingSpaces = 0; int leadSpaces = 0; int daysInPrevMonth = 0; int prevMonth = 0; int prevYear = 0; int nextMonth = 0; int nextYear = 0; int currentMonth = mm - 1; String currentMonthName = getMonthAsString(currentMonth); daysInMonth = getNumberOfDaysOfMonth(currentMonth); Log.d(tag, "Current Month: " + " " + currentMonthName + " having " + daysInMonth + " days."); // Gregorian Calendar : MINUS 1, set to FIRST OF MONTH GregorianCalendar cal = new GregorianCalendar(yy, currentMonth, 1); Log.d(tag, "Gregorian Calendar:= " + cal.getTime().toString()); Calendar caltemp = Calendar.getInstance(); Integer intMonat = caltemp.get(Calendar.MONTH); if (currentMonth == 11) { prevMonth = currentMonth - 1; daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth); nextMonth = 0; prevYear = yy; nextYear = yy + 1; Log.d(tag, "*->PrevYear: " + prevYear + " PrevMonth:" + prevMonth + " NextMonth: " + nextMonth + " NextYear: " + nextYear); } else if (currentMonth == 0) { prevMonth = 11; prevYear = yy - 1; nextYear = yy; daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth); nextMonth = 1; Log.d(tag, "**--> PrevYear: " + prevYear + " PrevMonth:" + prevMonth + " NextMonth: " + nextMonth + " NextYear: " + nextYear); } else { prevMonth = currentMonth - 1; nextMonth = currentMonth + 1; nextYear = yy; prevYear = yy; daysInPrevMonth = getNumberOfDaysOfMonth(prevMonth); Log.d(tag, "***---> PrevYear: " + prevYear + " PrevMonth:" + prevMonth + " NextMonth: " + nextMonth + " NextYear: " + nextYear); } // Compute how much to leave before before the first day of the // month. // getDay() returns 0 for Sunday. int currentWeekDay = cal.get(Calendar.DAY_OF_WEEK) - 1; trailingSpaces = currentWeekDay; Log.d(tag, "Week Day:" + currentWeekDay + " is " + getWeekDayAsString(currentWeekDay)); Log.d(tag, "No. Trailing space to Add: " + trailingSpaces); Log.d(tag, "No. of Days in Previous Month: " + daysInPrevMonth); if (cal.isLeapYear(cal.get(Calendar.YEAR)) && mm == 1) { ++daysInMonth; } // Trailing Month days for (int i = 0; i < trailingSpaces; i++) { Log.d(tag, "PREV MONTH:= " + prevMonth + " => " + getMonthAsString(prevMonth) + " " + String.valueOf((daysInPrevMonth - trailingSpaces + DAY_OFFSET) + i)); list.add(String.valueOf((daysInPrevMonth - trailingSpaces + DAY_OFFSET) + i) + "-GREY" + "-" + getMonthAsString(prevMonth) + "-" + prevYear); } // Current Month Days for (int i = 1; i <= daysInMonth; i++) { Log.d(currentMonthName, String.valueOf(i) + " " + getMonthAsString(currentMonth) + " " + yy); if (i == getCurrentDayOfMonth() && mm == intMonat+1) { list.add(String.valueOf(i) + "-BLUE" + "-" + getMonthAsString(currentMonth) + "-" + yy); } else { list.add(String.valueOf(i) + "-WHITE" + "-" + getMonthAsString(currentMonth) + "-" + yy); } } // Leading Month days for (int i = 0; i < list.size() % 7; i++) { Log.d(tag, "NEXT MONTH:= " + getMonthAsString(nextMonth)); list.add(String.valueOf(i + 1) + "-GREY" + "-" + getMonthAsString(nextMonth) + "-" + nextYear); } } /** * NOTE: YOU NEED TO IMPLEMENT THIS PART Given the YEAR, MONTH, retrieve * ALL entries from a SQLite database for that month. Iterate over the * List of All entries, and get the dateCreated, which is converted into * day. * * @param year * @param month * @return */ private HashMap findNumberOfEventsPerMonth(int year, int month) { HashMap map = new HashMap<String, Integer>(); // DateFormat dateFormatter2 = new DateFormat(); // // String day = dateFormatter2.format("dd", dateCreated).toString(); // // if (map.containsKey(day)) // { // Integer val = (Integer) map.get(day) + 1; // map.put(day, val); // } // else // { // map.put(day, 1); // } return map; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; Integer intRowNumber = 5; View row = convertView; if (row == null) { LayoutInflater inflater = (LayoutInflater) _context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); row = inflater.inflate(R.layout.calendar_day_gridcell, parent, false); //convertView = inflater.inflate(R.layout.calendar_day_gridcell,parent,false); holder = new ViewHolder(); holder.text = (TextView)row.findViewById(R.id.num_events_per_day); holder.gridcell= (Button)row.findViewById(R.id.calendar_day_gridcell); //holder.EventsofMonth = openCalendar.getEventsOfMonth(getActivity(), caltemp.getTimeInMillis(),strCalendarId); row.setTag(holder); } else { holder = (ViewHolder)row.getTag(); } int intHeight = mGv.getHeight(); intHeight = intHeight/intRowNumber; AbsListView.LayoutParams param = new AbsListView.LayoutParams( android.view.ViewGroup.LayoutParams.FILL_PARENT, mGv.getHeight()/intRowNumber); //row.setLayoutParams(param); row.setLayoutParams(param); // Get a reference to the Day gridcell //gridcell = (Button) row.findViewById(R.id.calendar_day_gridcell); //gridcell.setOnClickListener(new MyOnClickListener(position)); holder.gridcell.setOnClickListener(this); holder.gridcell.setOnLongClickListener(this); // ACCOUNT FOR SPACING Log.d(tag, "Current Day: " + getCurrentDayOfMonth()); String[] day_color = list.get(position).split("-"); String theday = day_color[0]; String themonth = day_color[2]; String theyear = day_color[3]; String selection = "((" + CalendarContract.Events.DTSTART + " >= ?) AND (" + CalendarContract.Events.DTEND + " <= ?) AND (" + CalendarContract.Events.DELETED + " = ?) AND (" + CalendarContract.Events.CALENDAR_ID + " = ?))"; if ((!eventsPerMonthMap.isEmpty()) && (eventsPerMonthMap != null)) { if (eventsPerMonthMap.containsKey(theday)) { //num_events_per_day = (TextView) row.findViewById(R.id.num_events_per_day); Integer numEvents = (Integer) eventsPerMonthMap.get(theday); //num_events_per_day.setText(numEvents.toString()); } } // Set the Day GridCell holder.gridcell.setText(theday); holder.gridcell.setTag(theday + "-" + themonth + "-" + theyear); Log.d(tag, "Setting GridCell " + theday + "-" + themonth + "-" + theyear); if (day_color[1].equals("GREY")) { holder.gridcell.setTextColor(Color.LTGRAY); } if (day_color[1].equals("WHITE")) { holder.gridcell.setTextColor(Color.WHITE); } if (day_color[1].equals("BLUE")) { //gridcell.setTextColor(getResources().getColor(R.color.static_text_color)); holder.gridcell.setTextColor(Color.BLUE); DisplayMetrics metrics; metrics = getActivity().getApplicationContext().getResources().getDisplayMetrics(); float Textsize = 0; Textsize = holder.gridcell.getTextSize()/metrics.density; holder.gridcell.setTextSize(Textsize+4); } //ermittle die Anzahl der Events an diesem Tag und schreibe sie in num_events_per_day Integer intAnzEventsonSelectedDay = 0; //num_events_per_day = (TextView) row.findViewById(R.id.num_events_per_day); String strCurrentDatum = theday + "-" + month + "-" + year; SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy"); Date dateObj = null; try { dateObj = sdf.parse(strCurrentDatum); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } String temp = dateObj.toString(); caltemp.setTime(dateObj); Cursor curCalendar = openCalendar.getEventsOfDay(getActivity(), caltemp.getTimeInMillis(),strCalendarId); curCalendar.moveToFirst(); intAnzEventsonSelectedDay = curCalendar.getCount(); if (intAnzEventsonSelectedDay > 4){ holder.text.setTextColor(Color.RED); } else{ // } holder.text.setText(intAnzEventsonSelectedDay.toString()); return row; }

最满意答案

我认为性能问题的一部分实际上是你做了多少工作才能达到一个月。 我能告诉你的最好的事情是首先从使用Calendar切换到使用MonthDisplayHelper 。 它是一个内置的Android类，基本上可以帮助您布局一个月。 它的格式也很好，每周都会分成一个int数组。 虽然仍然有Calendar因此它是保持当前信息的好方法。 更重要的是，不是从一天加载每个事件，而是首先加载月份，然后使用AsyncTask在关闭UI线程之后加载单个事件。 想象一下，每个月都有几个事件，在您向用户显示一个月视图之前需要进行大量计算。 一个很好的例子就是googles默认日历。 如果您有足够的事件，您会注意到在月视图显示后它们开始加载。 从可用性角度来看，它具有强大的功能。

I think part of the issue with performance is actually with how much work you are doing to get to a single month. The best thing I can tell you is firstly switch from using Calendar to using MonthDisplayHelper. Its a built in Android class that basically helps you layout a single month. Its a in a great format too, splitting each week into an int array. Though still have the Calendar there as its a great way to keep the current day info at hand. More importantly, instead of loading every event from a single day, load the month first, then use an AsyncTask to load the individual events after off the UI thread. Imagine having a few events a month, thats a lot of computation before you ever show just a month view to the user. A great example of this would be googles default calendar. If you have enough events you will notice they start to load up after the month view shows up. Its great functionality from usability standpoint.