在我的应用程序中，我正在全屏活动中使用ViewPager，一切正常，除了正确显示最后一张幻灯片的onSwipe动画外，它的行为就像是一个NavigationBar（照片中的示例）。
我该怎么办？
https://i.stack.imgur.com/f9Ldq.png
我的活动的.kt代码
import android.animation.ArgbEvaluator
import android.os.Bundle
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentPagerAdapter
import androidx.viewpager.widget.ViewPager
import kotlinx.android.synthetic.main.activity_walkthrough.*
//activity showing introduction to app which contains all app's not obvoius functions, and which welcomes new user - it should be shown only after first start of app (not after actualisations!)
class WalkthroughActivity : AppCompatActivity()
{
//adapter's class for ViewPager
inner class SectionsPagerAdapter(fm: FragmentManager) : FragmentPagerAdapter(fm)
{
//contains all set fragments
private val page = mutableListOf<Fragment>()
//adds fragment to list ('page' variable specified above)
fun addFragment(fragment: Fragment, backgroundColor: Int): SectionsPagerAdapter
{
page.add(fragment)
fragmentsColors.add(backgroundColor)
return this
}
//returns fragmnet by it's index
override fun getItem(position: Int): Fragment
{
return page[position]
}
//return number of all fragments in list ('page' variable specified above)
override fun getCount(): Int
{
return page.size
}
}
//adapter for ViewPager
private lateinit var adapter: SectionsPagerAdapter
//list of all fragments background's colors - used to moothly change background color while user swipes it
private var fragmentsColors = mutableListOf<Int>()
//determines if user want to slide last page - which means this activity should be finished
private var isSwipeOnLastPage=false
override fun onCreate(savedInstanceState: Bundle?)
{
// Enables regular immersive mode.
// For "lean back" mode, remove SYSTEM_UI_FLAG_IMMERSIVE.
// Or for "sticky immersive," replace it with SYSTEM_UI_FLAG_IMMERSIVE_STICKY
window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE
// Set the content to appear under the system bars so that the
// content doesn't resize when the system bars hide and show.
or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
// Hide the nav bar and status bar
or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
or View.SYSTEM_UI_FLAG_FULLSCREEN)
overridePendingTransition(R.anim.fade_in, R.anim.fade_out)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_walkthrough)
//adding listeners to slider movements events
container.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
override fun onPageScrollStateChanged(state: Int) {}
//animating background color change on sliding fragments
override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int)
{
if(position == adapter.count-1)
{
if(isSwipeOnLastPage)
stopThisActivity()
else
isSwipeOnLastPage=true
}
else
isSwipeOnLastPage=false
//color update
val colorUpdate = ArgbEvaluator().evaluate( positionOffset, fragmentsColors[position], fragmentsColors[if (position < fragmentsColors.size - 1) position + 1 else fragmentsColors.size - 1]) as Int
container.setBackgroundColor(colorUpdate)
//chanigng statusBar's color
window.statusBarColor=colorUpdate
window.navigationBarColor=colorUpdate
}
override fun onPageSelected(position: Int)
{
//if selected postiion is the last one - 'skip button' becomes invisible and 'next button' becomes 'finish button'
if(position == adapter.count-1)
{
skipBTN.visibility= View.INVISIBLE
nextBTN.text = "Zakończ"
nextBTN.setOnClickListener {
stopThisActivity()
}
}
else
skipBTN.visibility= View.VISIBLE
}
})
//if 'skip button' is clicked whole activity finishes
skipBTN.setOnClickListener {
stopThisActivity()
}
//if 'next button' is clicked currently shown fragment changes to the next one (with animation)
nextBTN.setOnClickListener {
container.setCurrentItem(container.currentItem+1, true)
}
//creating ViewPager's adapter and specyfiyng it's fragments
adapter = SectionsPagerAdapter(supportFragmentManager)
.addFragment(WalkthroughFragmentOne(), ContextCompat.getColor(this, android.R.color.holo_orange_light))
.addFragment(WalkthroughFragmentOne(), ContextCompat.getColor(this, android.R.color.holo_green_light))
.addFragment(WalkthroughFragmentOne(), ContextCompat.getColor(this, android.R.color.holo_red_light))
//chanigng statusBarColor to match first fragment background's color
window.statusBarColor=ContextCompat.getColor(this, android.R.color.holo_orange_light)
//setting number of dots to number of set fragments in ViewPager's adapter
container.adapter = this.adapter
}
//stops this activity - used to perform additional actions before ending
private fun stopThisActivity()
{
this.finish()
}
}
我的活动的.xml文件
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="false"
tools:context=".MainActivity">
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:padding="0dp">
<androidx.viewpager.widget.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
<ImageView android:layout_width="match_parent"
android:layout_height="1dp"
android:alpha="0.2"
android:src="@drawable/black_gradient_divider" app:layout_anchorGravity="left|top"
app:layout_anchor="@+id/nextBTN"/>
<Button
android:text="Pomiń"
android:textColor="#64000000"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/skipBTN" app:layout_anchorGravity="left|bottom"
app:layout_anchor="@+id/container"
android:background="@android:color/transparent"/>
<Button
android:text="Dalej"
android:textColor="#64000000"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/nextBTN" app:layout_anchorGravity="right|bottom"
app:layout_anchor="@+id/container"
android:background="@android:color/transparent"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</FrameLayout>