如果暂停结束片段,然后打开Resumed,则自动更改初始位置并打开第一个片段

**如果暂停结束片段,然后打开Resumed,则自动更改初始位置并打开第一个片段。***共有五页;一个容器显示所有片段列表,然后单击next并返回活动。我的案例出现了问题,打开片段,点击下一个到最后一个位置。工作是完美的,但点击android后台按钮,然后暂停最后一个片段,再次恢复,然后自动更改最初的第一个片段位置*

private fun setUpViewPager(){

        val fragmentList : MutableList< Fragment> = mutableListOf()
        fragmentList.add(SurveyPageOneFragment.newInstance(false))
        fragmentList.add(SurveyPageTwoFragment.newInstance(false))
        fragmentList.add(SurveyPageThreeFragment.newInstance(false))
        fragmentList.add(SurveyPageFourFragment.newInstance(false))
        fragmentList.add(SurveyPageFiveFragment.newInstance(false))

        surveyPagerAdapter = SurveyPagerAdapter(fragmentList,supportFragmentManager,lifecycle)
        binding.viewPager.adapter = surveyPagerAdapter
        binding.dotsIndicator.attachTo(binding.viewPager)

    }

private fun setOnClick(){
        binding.btnNext.setOnClickListener {
            if (binding.viewPager.currentItem < binding.viewPager.adapter?.itemCount!!){
                when (fragPosition) {
                    0 -> {
                        Log.i("TAG", "Page 1: Position $fragPosition")
                        binding.viewPager.currentItem = binding.viewPager.currentItem +1
                    }
                    1 -> {
                        Log.i("TAG", "Page 2: Position $fragPosition")
                        binding.viewPager.currentItem = binding.viewPager.currentItem +1
                    }
                    2 -> {
                        Log.i("TAG", "Page 3: Position $fragPosition")
                        binding.viewPager.currentItem = binding.viewPager.currentItem +1
                    }
                    3 -> {
                        Log.i("TAG", "Page 4: Position $fragPosition")
                        binding.viewPager.currentItem = binding.viewPager.currentItem +1
                    }
                    4 -> {
                        Log.i("TAG", "Page 5: Position $fragPosition")
                        binding.viewPager.isUserInputEnabled = true
                        binding.viewPager.currentItem = binding.viewPager.currentItem +1
                    }
                }
            }
        }


        binding.btnBack.setOnClickListener {
            if (binding.viewPager.currentItem != 0){
                binding.viewPager.currentItem = binding.viewPager.currentItem -1
            }
        }

        binding.btnDone.setOnClickListener {
            startActivity(Intent(context,SurveyCompleteActivity::class.java))
        }

        val onPageChangeCallback = object : OnPageChangeCallback(){
            override fun onPageSelected(position: Int) {
                Log.i("TAG", "PageChange: $position")
                fragPosition = position

                if (position == 0){
                    binding.btnBack.visibility = View.GONE
                }else{
                    binding.btnBack.visibility = View.VISIBLE
                }

                if (position < binding.viewPager.adapter?.itemCount!! -1){
                    binding.btnNext.visibility = View.VISIBLE
                    binding.btnDone.visibility = View.GONE
                }else{
                    binding.btnNext.visibility = View.GONE
                    binding.btnDone.visibility = View.VISIBLE
                    binding.viewPager.isUserInputEnabled = false
                }

            }
        }
        binding.viewPager.registerOnPageChangeCallback(onPageChangeCallback)
    }

片段一

 override fun onResume() {
        Log.i("TAG", "onResume: survey page one")
        super.onResume()
        viewLifecycleOwner.lifecycle.currentState === Lifecycle.State.RESUMED
    }

    override fun onPause() {
        Log.i("TAG", "onPause: survey page one")
        super.onPause()
    }

    override fun onDestroy() {
        super.onDestroy()
        _binding = null
    }

    companion object {
        @JvmStatic
        fun newInstance(isMyBoolean: Boolean) = SurveyPageOneFragment().apply {
            val fragment = SurveyPageOneFragment()
            arguments = Bundle().apply {
                putBoolean("REPLACE WITH A STRING CONSTANT", isMyBoolean)
            }
            fragment.arguments
            return fragment
        }
    }

片段五

override fun onResume() {
        Log.i("TAG", "onResume: survey page five")
        super.onResume()
        viewLifecycleOwner.lifecycle.currentState === Lifecycle.State.RESUMED
    }

    override fun onPause() {
        Log.i("TAG", "onPause: survey page five")
        super.onPause()
    }

    override fun onDestroy() {
        super.onDestroy()
         _binding = null
    }


    companion object {

        @JvmStatic
        fun newInstance(isMyBoolean: Boolean) = SurveyPageFiveFragment().apply {
            val fragment = SurveyPageFiveFragment()
            arguments = Bundle().apply {
                putBoolean("REPLACE WITH A STRING CONSTANT", isMyBoolean)
            }
            fragment.arguments
            return fragment
        }
    }