我已经为 FragmentPagerAdapter
编写了以下代码来设置 ViewPager。
class ViewPagerAdapter(manager: FragmentManager) : FragmentPagerAdapter(manager) {
private val mFragmentList = ArrayList<Fragment>()
private val mFragmentTitleList = ArrayList<String>()
override fun getItem(position: Int): Fragment = mFragmentList[position]
override fun getCount(): Int = mFragmentList.size
fun addFragment(fragment: Fragment, title: String) {
mFragmentList.add(fragment)
mFragmentTitleList.add(title)
}
fun addFragment(fragment: Fragment) {
mFragmentList.add(fragment)
}
override fun getPageTitle(position: Int): CharSequence = mFragmentTitleList[position]
}
在 Activity 中,我有以下方法来设置 View 寻呼机。
private fun setupViewPager(viewPager: ViewPager, dataList: List<CholesterolMonthlySummary>) {
Log.i(TAG, "Size of the dataList passing through setupViewPager is ${dataList.size}")
val adapter = ViewPagerAdapter(supportFragmentManager)
adapter.addFragment(CholesterolPagingFragment.newInstance(ArrayList(dataList), CHOL))
adapter.addFragment(CholesterolPagingFragment.newInstance(ArrayList(dataList), LDL))
adapter.addFragment(CholesterolPagingFragment.newInstance(ArrayList(dataList), HDL))
adapter.addFragment(CholesterolPagingFragment.newInstance(ArrayList(dataList), TRIG))
viewPager.adapter = adapter
}
当新数据集进来时,我再次调用上述方法并再次更改适配器,但我已经实例化的 View 没有得到更新。只有未实例化的 View 才会更新。
我什至尝试过 notifyDataSetChange()
将以下代码添加到 Adapter,但这也不起作用。
override fun getItemPosition(`object`: Any?): Int = FragmentPagerAdapter.POSITION_NONE
最佳答案
当你想更新 View 时,你可以尝试直接调用adapter.notifyDataSetChanged()
。
也许您需要在插入新数据之前清除mFragmentList
和mFragmentTitleList
?
关于android - 无法更新 FragmentPagerAdapter 中的 fragment ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48001611/