如何根据布尔值在 viewPager 中动态创建片段？

Question

这些代码有效。我根据这些布尔值是 false 还是 true 创建 Fragment。但我想用更少的代码来做到这一点。我只是尝试将它们添加到 for 循环中，但它也变得更长了。如何使用更少的代码在此处动态创建片段？我在 Whosebug 和互联网上都找不到解决方案。

    class ReportASMViewPagerAdapter(
        fragmentManager: FragmentManager,
        lifecycle: Lifecycle,
        private val visitId: String,
        private val facilityId: String,
        private val tabItemCount: Int,
        private val hasLabResult: Boolean,
        private val hasRadResult: Boolean
    ) : FragmentStateAdapter(fragmentManager, lifecycle) {
        override fun getItemCount(): Int {
            return tabItemCount
        }
    
        override fun createFragment(position: Int): Fragment {
            
            if (hasLabResult && hasRadResult) {
                return when (position) {
                    0 -> {
                        LaboratoryASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
                    }
                    1 -> {
                        RadiologyASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
                    }
                    2 -> {
                        PrescriptionASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
                    }
                    3 -> {
                        OtherReportsASMFragment()
                    }
                    else -> {
                        Fragment()
                    }
                }
            } else if (hasLabResult && !hasRadResult) {
                return when (position) {
                    0 -> {
                        LaboratoryASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
                    }
                    1 -> {
                        PrescriptionASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
                    }
                    2 -> {
                        OtherReportsASMFragment()
                    }
                    else -> {
                        Fragment()
                    }
                }
            } else {
                return when (position) {
                    0 -> {
                        RadiologyASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
                    }
                    1 -> {
                        PrescriptionASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
                    }
                    2 -> {
                        OtherReportsASMFragment()
                    }
                    else -> {
                        Fragment()
                    }
                }
            }
        }
    }

Answer 1

您可以使用以下代码，但我认为您的代码更具可读性：

 override fun createFragment(position: Int): Fragment {

        var newPosition = position

        if (hasLabResult && hasRadResult) {
            newPosition = position
        } else if (hasLabResult && !hasRadResult) {
            if (position >= 1) newPosition = position + 1
        } else {
            if (position != 0) newPosition = position + 1
        }

        return when (newPosition) {
            0 -> LaboratoryASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
            1 -> RadiologyASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
            2 -> PrescriptionASMFragment.newInstance(referenceVisitId = visitId, facilityId = facilityId)
            3 -> OtherReportsASMFragment()
            else -> Fragment()
        }
        
    }

如何根据布尔值在 viewPager 中动态创建片段？

How can I create Fragments dynamically in viewPager according to boolean values?

android

kotlin

android-viewpager2