记录：ViewPager2 + FragmentStateAda

Activity代码

        val fragments = arrayListOf(
            CustomFragment.get(1),
            CustomFragment.get(2),
            CustomFragment.get(3),
            CustomFragment.get(4),
        )

//        FragmentStatePagerAdapter(supportFragmentManager,BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT)

        findViewById<ViewPager2>(R.id.viewpage2).adapter =
            object : FragmentStateAdapter(supportFragmentManager, lifecycle) {
                override fun getItemCount(): Int {
                    return  fragments.size
                }

                override fun createFragment(position: Int): Fragment {
                   return fragments[position]
                }

            }

Fragment代码

class CustomFragment : Fragment() {


    companion object{

        fun get(index:Int): CustomFragment {
            return CustomFragment().apply {
                arguments = Bundle().apply {
                    putInt("index",index)
                }
            }
        }

    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        log("onCreateView")
        return inflater.inflate(R.layout.fragment_custom, container, false)
    }


    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val nextInt = Random.nextInt(0, 5)
        val colors = arrayListOf(
            Color.RED,
            Color.BLACK,
            Color.BLUE,
            Color.DKGRAY,
            Color.WHITE
        )
//        Color.RED
//        Color.BLACK
//        Color.BLUE
//        Color.DKGRAY
//        Color.WHITE
//        Color.LTGRAY
//        Color.GREEN
        view.setBackgroundColor(colors[nextInt])
        log("onViewCreated")
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        log("onCreate")
    }

    override fun onStart() {
        super.onStart()
        log("onStart")
    }

    override fun onResume() {
        super.onResume()
        log("onResume")
    }

    override fun onPause() {
        super.onPause()
        log("onPause")
    }

    override fun onStop() {
        super.onStop()
        log("onStop")
    }

    override fun onDestroyView() {
        super.onDestroyView()
        log("onDestroyView")
    }

    override fun onDestroy() {
        super.onDestroy()
        log("onDestroy")
    }


    fun log(tag:String){
        val index = arguments?.getInt("index", 0)

        Log.d("CustomFragment", "log:  CustomFragment$index 的生命周期: $tag")
    }
}

• 刚进入页面调用情况

CustomFragment: log:  CustomFragment1 的生命周期: onCreate
CustomFragment: log:  CustomFragment1 的生命周期: onCreateView
CustomFragment: log:  CustomFragment1 的生命周期: onViewCreated
CustomFragment: log:  CustomFragment1 的生命周期: onStart
CustomFragment: log:  CustomFragment1 的生命周期: onResume

• 滑动到index=2时调用情况

CustomFragment: log:  CustomFragment2 的生命周期: onCreate
CustomFragment: log:  CustomFragment2 的生命周期: onCreateView
CustomFragment: log:  CustomFragment2 的生命周期: onViewCreated
CustomFragment: log:  CustomFragment2 的生命周期: onStart
CustomFragment: log:  CustomFragment1 的生命周期: onPause
CustomFragment: log:  CustomFragment2 的生命周期: onResume

• 滑动到index=3时调用情况

CustomFragment: log:  CustomFragment3 的生命周期: onCreate
CustomFragment: log:  CustomFragment3 的生命周期: onCreateView
CustomFragment: log:  CustomFragment3 的生命周期: onViewCreated
CustomFragment: log:  CustomFragment3 的生命周期: onStart
CustomFragment: log:  CustomFragment2 的生命周期: onPause
CustomFragment: log:  CustomFragment3 的生命周期: onResume

• 滑动到index=4时调用情况

CustomFragment: log:  CustomFragment4 的生命周期: onCreate
CustomFragment: log:  CustomFragment4 的生命周期: onCreateView
CustomFragment: log:  CustomFragment4 的生命周期: onViewCreated
CustomFragment: log:  CustomFragment4 的生命周期: onStart
CustomFragment: log:  CustomFragment3 的生命周期: onPause
CustomFragment: log:  CustomFragment4 的生命周期: onResume

• 熄屏

CustomFragment: log:  CustomFragment4 的生命周期: onPause
CustomFragment: log:  CustomFragment1 的生命周期: onStop
CustomFragment: log:  CustomFragment2 的生命周期: onStop
CustomFragment: log:  CustomFragment3 的生命周期: onStop
CustomFragment: log:  CustomFragment4 的生命周期: onStop

• 亮屏

CustomFragment: log:  CustomFragment1 的生命周期: onStart
CustomFragment: log:  CustomFragment2 的生命周期: onStart
CustomFragment: log:  CustomFragment3 的生命周期: onStart
CustomFragment: log:  CustomFragment4 的生命周期: onStart
CustomFragment: log:  CustomFragment4 的生命周期: onResume