ViewPager2在滑动后不会重新创建ui

Question

我使用的是viewpager2，在适配器类中单击按钮后，我想要更改按钮的颜色。但是在没有点击按钮的情况下滑动7-8次后，按钮的颜色会发生变化，这样viewpager就不会重新创建ui。下面是我的适配器类：

class MyAdapter(private val mData :List<String>) : RecyclerView.Adapter<MyAdapter.MyViewHolder>() {
inner  class MyViewHolder(private val binding:ItemDataBinding) :RecyclerView.ViewHolder(binding.root) {
    fun bind(data :String) {
        binding.mText.text = data
        binding.btnclick.setOnClickListener {
            binding.btnclick.setBackgroundColor(ContextCompat.getColor(context,R.color.blue))
        }
    }
}

override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
    (holder as MyViewHolder).bind(mData[position])
}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
    val binding = ItemDataBinding.inflate(LayoutInflater.from(parent.context),parent,false)
    return MyViewHolder(binding)
}

override fun getItemCount(): Int {
    return mData.size
}

}

在主要活动中，我是如何声明View pager的

class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val data = listOf<String>("s","a","b","c","d","e","f","g","h","ı","i")
    val  viewpager = findViewById<ViewPager2>(R.id.mViewPager)
    val adapter = MyAdapter(data)
    viewpager.adapter = adapter

}

}

Answer 1

尝试将setOffscreenPageLimit(int limit)设置为0，有关setOffscreenPageLimit和缓存的详细信息，请参阅this和that

viewpager.setOffscreenPageLimit( 0 )