| package com.airbnb.lottie.samples |
| |
| import android.os.Bundle |
| import android.support.v4.app.Fragment |
| import android.support.v4.view.ViewPager |
| import android.view.LayoutInflater |
| import android.view.View |
| import android.view.ViewGroup |
| import android.view.animation.Interpolator |
| import android.widget.Scroller |
| import com.airbnb.lottie.LottieAnimationView |
| import com.matthewtamlin.sliding_intro_screen_library.buttons.IntroButton |
| import com.matthewtamlin.sliding_intro_screen_library.core.IntroActivity |
| import com.matthewtamlin.sliding_intro_screen_library.core.LockableViewPager |
| |
| |
| class AppIntroActivity : IntroActivity() { |
| private val ANIMATION_TIMES = floatArrayOf(0f, 0.3333f, 0.6666f, 1f, 1f) |
| |
| private val animationView: LottieAnimationView by lazy { |
| rootView.inflate(R.layout.app_intro_animation_view, false) as LottieAnimationView |
| } |
| private val viewPager: LockableViewPager by lazy { |
| findViewById<LockableViewPager>(R.id.intro_activity_viewPager) |
| } |
| |
| override fun generatePages(savedInstanceState: Bundle?): Collection<Fragment> { |
| return listOf( |
| EmptyFragment.newInstance(), |
| EmptyFragment.newInstance(), |
| EmptyFragment.newInstance(), |
| EmptyFragment.newInstance() |
| ) |
| } |
| |
| override fun onCreate(savedInstanceState: Bundle?) { |
| super.onCreate(savedInstanceState) |
| rootView.addView(animationView, 0) |
| setViewPagerScroller() |
| |
| addPageChangeListener(OnPageChangeListenerAdapter( |
| onPageScrolled = { position, positionOffset, _ -> |
| setAnimationProgress(position, positionOffset) |
| } |
| )) |
| } |
| |
| override fun generateFinalButtonBehaviour(): IntroButton.Behaviour { |
| return object : IntroButton.Behaviour { |
| override fun setActivity(activity: IntroActivity) { finish() } |
| override fun getActivity(): IntroActivity? = null |
| override fun run() {} |
| } |
| } |
| |
| private fun setAnimationProgress(position: Int, positionOffset: Float) { |
| val startProgress = ANIMATION_TIMES[position] |
| val endProgress = ANIMATION_TIMES[position + 1] |
| |
| animationView.progress = startProgress.lerp(endProgress, positionOffset) |
| } |
| |
| class EmptyFragment : Fragment() { |
| |
| override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { |
| return container!!.inflate(R.layout.fragment_empty, false) |
| } |
| |
| companion object { |
| internal fun newInstance(): EmptyFragment { |
| return EmptyFragment() |
| } |
| } |
| } |
| |
| private fun setViewPagerScroller() { |
| try { |
| val scrollerField = ViewPager::class.java.getDeclaredField("mScroller") |
| scrollerField.isAccessible = true |
| val interpolator = ViewPager::class.java.getDeclaredField("sInterpolator") |
| interpolator.isAccessible = true |
| |
| val scroller = object : Scroller(this, interpolator.get(null) as Interpolator) { |
| override fun startScroll(startX: Int, startY: Int, dx: Int, dy: Int, duration: Int) { |
| super.startScroll(startX, startY, dx, dy, duration * 7) |
| } |
| } |
| scrollerField.set(viewPager, scroller) |
| } catch (e: NoSuchFieldException) { |
| // Do nothing. |
| } catch (e: IllegalAccessException) { |
| // Do nothing. |
| } |
| } |
| } |