本文實例為大家分享了Android控件ViewPager實現卡片翻動效果的具體代碼，供大家參考，具體內容如下
先放一張效果圖：
想要實現這樣的效果其實并不是太難，需要對ViewPager的一些細節屬性更深入的了解和認識，下面介紹下一個小demo的實現過程：
第一步、創建卡片viewpager適配器的itemview的布局文件：
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/bitmap" android:gravity="center"> <ImageView android:id="@+id/home_viewpage_item_img" android:paddingBottom="@dimen/dp_82" android:paddingTop="@dimen/dp_82" android:paddingLeft="@dimen/dp_44" android:paddingRight="@dimen/dp_44" android:layout_width="match_parent" android:layout_height="match_parent" android:src="@drawable/ic_launcher" /></RelativeLayout>
第二步、創建適配器：
class CardAdapter(var context: Context) : PagerAdapter() { val horoscopestrImgs = intArrayOf(R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher, R.drawable.ic_launcher) override fun isViewFromObject(view: View, `object`: Any): Boolean { return view === `object` } override fun getCount(): Int { return 12 * 30 } override fun instantiateItem(container: ViewGroup, position: Int): Any { val view = LayoutInflater.from(context).inflate(R.layout.home_viewpage_item, null) view.home_viewpage_item_img.setImageResource(horoscopestrImgs.get(position%12)) container.addView(view) return view } override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) { container.removeView(`object` as View) }}第三步、創建放viewpager控件的布局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:background="#fff" android:layout_height="match_parent" > <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_centerInParent="true" android:overScrollMode="never" android:paddingBottom="@dimen/dp_240" android:paddingLeft="50dp" android:paddingRight="50dp" android:paddingTop="@dimen/dp_60" /></RelativeLayout>
第四步、創建viewpager滑動切換動畫效果：
class CardTransformer(var context: Context) :ViewPager.PageTransformer{ val TAG = "CardTransformer" private val MAX_SCALE = 1.0f private val MIN_SCALE = 0.85f//0.85f var animator:ObjectAnimator?=null override fun transformPage(page: View, position: Float) { //設置了內間距 有0.15的偏差 var pos=position -0.15.toFloat() if ( pos <= 1) { val scaleFactor = MIN_SCALE + (1 - Math.abs(pos)) * (MAX_SCALE - MIN_SCALE) page.scaleX = scaleFactor //縮放效果 if (pos > 0) { page.translationX = -scaleFactor * 2 } else if (pos < 0 && pos > -1) { page.translationX = scaleFactor * 2 } page.scaleY = scaleFactor } else { page.scaleX = MIN_SCALE page.scaleY = MIN_SCALE } }}第五步、開始調用實現卡片效果的關鍵代碼：
class MainActivity : Activity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main7) //設置ViewPager中兩頁之間的距離 // viewpager?.setPageMargin(80) //自定義ViewPager的頁面切換動畫 viewpager?.setPageTransformer(false, CardTransformer(applicationContext)) //設置viewpager預加載的頁數 viewpager?.offscreenPageLimit = 5 viewpager?.currentItem = 12 * 15 viewpager?.setAdapter(CardAdapter(this)) }}到這里就基本實現了想要的卡片滑動切換和展示效果了！
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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