android: Fix first time setup scrolling bug
If you quickly scrolled from the second page to the first and then back, the next/back buttons would disappear.
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@ -110,23 +110,24 @@ class SetupFragment : Fragment() {
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}
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binding.viewPager2.registerOnPageChangeCallback(object : OnPageChangeCallback() {
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override fun onPageScrolled(
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position: Int,
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positionOffset: Float,
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positionOffsetPixels: Int
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) {
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super.onPageScrolled(position, positionOffset, positionOffsetPixels)
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if (position == 0) {
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hideView(binding.buttonBack)
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} else {
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showView(binding.buttonBack)
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}
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var previousPosition: Int = 0
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if (position == pages.size - 1 || position == 0) {
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override fun onPageSelected(position: Int) {
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super.onPageSelected(position)
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if (position == 1 && previousPosition == 0) {
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showView(binding.buttonNext)
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showView(binding.buttonBack)
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} else if (position == 0 && previousPosition == 1) {
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hideView(binding.buttonBack)
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hideView(binding.buttonNext)
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} else {
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} else if (position == pages.size - 1 && previousPosition == pages.size - 2) {
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hideView(binding.buttonNext)
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} else if (position == pages.size - 2 && previousPosition == pages.size - 1) {
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showView(binding.buttonNext)
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}
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previousPosition = position
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}
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})
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@ -154,10 +155,6 @@ class SetupFragment : Fragment() {
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}
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private fun showView(view: View) {
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if (view.visibility == View.VISIBLE) {
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return
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}
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view.apply {
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alpha = 0f
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visibility = View.VISIBLE
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@ -169,7 +166,7 @@ class SetupFragment : Fragment() {
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}
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private fun hideView(view: View) {
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if (view.visibility == View.GONE) {
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if (view.visibility == View.INVISIBLE) {
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return
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}
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@ -22,6 +22,7 @@
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android:layout_height="wrap_content"
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android:layout_margin="16dp"
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android:text="@string/next"
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android:visibility="invisible"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent" />
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@ -32,6 +33,7 @@
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android:layout_height="wrap_content"
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android:layout_margin="16dp"
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android:text="@string/back"
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android:visibility="invisible"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintStart_toStartOf="parent" />
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