ViewPager2：以编程方式选择特定片段

如何解决ViewPager2：以编程方式选择特定片段

我正在尝试以编程方式在 ViewPager2 中选择特定片段，例如第二个或第三个片段。它不能正常工作。有时有效，有时无效。尽管它每次都适用于 TabLayout。

我尝试过的：

1. 我尝试过使用 ViewPager2.post 像 paymentViewpager.post { paymentViewpager.currentItem = 1 }。
2. 尝试在 paymentViewpager.setCurrentItem(tab.position,true) 回调中添加 TabLayoutMediator。
3. 我已经仔细检查过，我在设置适配器后调用了 paymentViewpager.setCurrentItem。

代码如下。

在 Activity 的 onCreate 中

if (!isGuestUser) {
        getPaymentMethod()
        viewModel.getMyProfile()
    } else {
        val adapter = SecureCheckoutPaymentSelectionAdapter(
                activity = this,callback = this,gPayCallback = this,paypalCallBack = this,cardPaymentList = arrayListOf(),gPayPaymentDetail = arrayListOf(),payPalPaymentDetail = arrayListOf(),isPaymentMethodPresent = false,itemsCount = THREE,userType = userType,isGuestUser
        )
        binding.includeSecureCheckoutPaymentDetails.paymentViewpager.adapter = adapter

        initTabLayout()
    }

private fun initTabLayout() {
    TabLayoutMediator(binding.includeSecureCheckoutPaymentDetails.paymentTab,binding.includeSecureCheckoutPaymentDetails.paymentViewpager) { tab,position ->
        val view = DataBindingUtil.inflate<LayoutTabImageBinding>(LayoutInflater.from(this),R.layout.layout_tab_image,tab.view,true)

        when (position) {
            0 -> {
                view.icon.setImageDrawable(ContextCompat.getDrawable(this,R.drawable.card_payment))
            }
            1 -> {
                view.icon.setBackgroundResource(R.drawable.google_pay_primary_logo)
            }
            else -> {
                view.icon.setImageDrawable(ContextCompat.getDrawable(this,R.drawable.paypal_card))
            }
        }
        tab.customView = view.root
        binding.includeSecureCheckoutPaymentDetails.paymentViewpager.setCurrentItem(tab.position,true)
    }.attach()
}

当 API 响应在一段时间后出现时，我需要选择 ViewPager2 的 2nd Fragment。下面的代码在该函数中执行。

val adapter = SecureCheckoutPaymentSelectionAdapter(
                                activity = this,cardPaymentList = if (userType == PERSONAL_USER_TYPE) paymentSavedResponse.personalCards as ArrayList<PaymentMethod>
                                else paymentSavedResponse.businessCards as ArrayList<PaymentMethod>,gPayPaymentDetail = paymentSavedResponse.googlePay as ArrayList<GooglePay>,payPalPaymentDetail = paymentSavedResponse.paypalAccount,isPaymentMethodPresent = paymentSavedResponse.paymentMethodPresent,isGuestUser
                        )
                        binding.includeSecureCheckoutPaymentDetails.paymentViewpager.adapter = adapter

                        initTabLayout()
                        setViewPagerClick()

                        if (paymentSavedResponse.latestPaymentDetails?.paymentMethodPresent == true) {
                            Log.e("mk","in paymentMethodPresent == true...")
                            when {
                                paymentSavedResponse.latestPaymentDetails.paymentMethod.size > ZERO -> {
                                    Log.e("mk","in card...")
                                    binding.includeSecureCheckoutPaymentDetails.apply {
                                        paymentViewpager.currentItem = ZERO
                                        //paymentTab.selectTab(paymentTab.getTabAt(ZERO))
                                    }
                                }
                                paymentSavedResponse.latestPaymentDetails.googlePay.size > ZERO -> {
                                    Log.e("mk","in GPay...")
                                    binding.includeSecureCheckoutPaymentDetails.apply {
                                        paymentViewpager.currentItem = ONE
                                        //paymentTab.selectTab(paymentTab.getTabAt(ONE))
                                    }
                                }
                                else -> {
                                    Log.e("mk","in Else...")
                                    binding.includeSecureCheckoutPaymentDetails.apply {
                                        paymentViewpager.currentItem = TWO
                                        //paymentTab.selectTab(paymentTab.getTabAt(TWO))
                                    }
                                }
                            }
                        }

我遇到了同样的问题 here，但尚未接受答案。任何帮助将不胜感激。

解决方法

我在使用 ViewPager2 时遇到了这个问题，对我来说原因是启用了 smoothScroll（setCurrentItem 中的第二个参数），因为启用它会使 ViewPager 转到错误页面

所以修复是禁用它：

binding.includeSecureCheckoutPaymentDetails.paymentViewpager.setCurrentItem(tab.position,false)