我已经GridView
在我的 3 页上放置了ViewPager
。这个想法是建立一个日历的月视图,可以根据用户的需要无限滚动。
我的工作主要基于Jon Willis的无限视图分页的实现。但不是实现我自己的View
对象;我正在使用GridView
s。
这是我对该onPageScrollStateChanged
方法的实现:
@Override
public void onPageScrollStateChanged(int state) {
if (state == ViewPager.SCROLL_STATE_IDLE) {
FragmentPagerAdapter adapter = (FragmentPagerAdapter) mMonthPager
.getAdapter();
// Called to obtain reference for the Fragments inside the ViewPager.
CalendarGridMonthlyFragment oldMinMonthFragment = (CalendarGridMonthlyFragment) adapter
.instantiateItem(mMonthPager, 0);
CalendarGridMonthlyFragment oldMidMonthFragment = (CalendarGridMonthlyFragment) adapter
.instantiateItem(mMonthPager, 1);
CalendarGridMonthlyFragment oldMaxMonthFragment = (CalendarGridMonthlyFragment) adapter
.instantiateItem(mMonthPager, 2);
// Get the selected month for each Fragment.
final Calendar oldMinMonth = oldMinMonthFragment.getSelectedMonth();
final Calendar oldMidMonth = oldMidMonthFragment.getSelectedMonth();
final Calendar oldMaxMonth = oldMaxMonthFragment.getSelectedMonth();
if (mFocusedPage == 0) {
final Calendar newMonth = (Calendar) oldMinMonth.clone();
newMonth.add(Calendar.MONTH, -1);
oldMinMonthFragment.setSelectedMonth(newMonth);
oldMidMonthFragment.setSelectedMonth(oldMinMonth);
oldMaxMonthFragment.setSelectedMonth(oldMidMonth);
} else if (mFocusedPage == 2) {
final Calendar newMonth = (Calendar) oldMaxMonth.clone();
newMonth.add(Calendar.MONTH, 1);
oldMinMonthFragment.setSelectedMonth(oldMidMonth);
oldMidMonthFragment.setSelectedMonth(oldMaxMonth);
oldMaxMonthFragment.setSelectedMonth(newMonth);
}
mMonthPager.setCurrentItem(1, false);
}
}
这是我的setSelectedMonth
方法:
public void setSelectedMonth(Calendar value) {
mMonth = value.get(Calendar.MONTH);
mYear = value.get(Calendar.YEAR);
CalendarGridMonthlyAdapter newAdapter = new CalendarGridMonthlyAdapter(
mContext, GRID_CHIP, mGridWidth, mGridHeight,
mMonth, mYear);
mGridView.setAdapter(newAdapter);
}
无限滑动有效。但是在滚动完成后有一个明显的闪烁——几乎是半秒。
调试告诉我,setAdapter
方法是所有这些大惊小怪的罪魁祸首。那么有什么方法可以加快设置新适配器的过程吗?
..或者也许是另一种方式?
提前致谢!