這期內(nèi)容當(dāng)中小編將會(huì)給大家?guī)碛嘘P(guān)怎么在android中使用viewpager實(shí)現(xiàn)豎屏滑動(dòng)效果,文章內(nèi)容豐富且以專業(yè)的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
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public class VerticalViewPager extends ViewPager { private OnItemClickListener mOnItemClickListener; public VerticalViewPager(Context context) { super(context); init(); } public VerticalViewPager(Context context, AttributeSet attrs) { super(context, attrs); init(); setup(); } private void init() { // The majority of the magic happens here setPageTransformer(true, new VerticalPageTransformer()); // The easiest way to get rid of the overscroll drawing that happens on the left and right setOverScrollMode(OVER_SCROLL_NEVER); } private MotionEvent swapXY(MotionEvent ev) { float width = getWidth(); float height = getHeight(); float newX = (ev.getY() / height) * width; float newY = (ev.getX() / width) * height; ev.setLocation(newX, newY); return ev; } @Override public boolean onInterceptTouchEvent(MotionEvent ev){ boolean intercepted = super.onInterceptTouchEvent(swapXY(ev)); swapXY(ev); // return touch coordinates to original reference frame for any child views return intercepted; } private float scaleY ; @Override public boolean onTouchEvent(MotionEvent ev) { System.out.println("----------getY" + ev.getY()); System.out.println("----------scaleY" + scaleY); if (ev.getAction()==MotionEvent.ACTION_MOVE){ } if (ev.getAction()==MotionEvent.ACTION_DOWN){ scaleY = ev.getY(); } if (ev.getAction()==MotionEvent.ACTION_UP){ if (scaleY == ev.getY()){ System.out.println("------------------======"); scaleY= 0; return false; } } try { return super.onTouchEvent(swapXY(ev)); }catch (Exception e){ } return true; } public void setOnItemClickListener(OnItemClickListener onItemClickListener) { mOnItemClickListener = onItemClickListener; } public interface OnItemClickListener { void onItemClick(int position); } private void setup() { final GestureDetector tapGestureDetector = new GestureDetector(getContext(), new TapGestureListener()); setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { tapGestureDetector.onTouchEvent(event); return false; } }); } private class TapGestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onSingleTapConfirmed(MotionEvent e) { if(mOnItemClickListener != null) { mOnItemClickListener.onItemClick(getCurrentItem()); } return true; } } }
要實(shí)現(xiàn)動(dòng)畫效果的核心就在 setPageTransformer(true, new VerticalPageTransformer());,大家都知道這個(gè)是設(shè)置Viewpager 設(shè)置動(dòng)畫的方法 ,那么要實(shí)現(xiàn)這個(gè)如果用系統(tǒng)自帶的切換動(dòng)畫效果的話 肯定是不符合Viewpager 豎屏滑動(dòng)的效果的。所以自定義PageTransformer 就是必然的趨勢(shì)了
private class VerticalPageTransformer implements ViewPager.PageTransformer { private float MIN_SCALE = 0.5f; @Override public void transformPage(View view, float position) { if (position < -1) { // [-Infinity,-1) // This page is way off-screen to the left. view.setAlpha(0); }else if (position <= 0) { // [-1,1] view.setAlpha(1 + position); view.setTranslationX(-view.getWidth() * position); view.setPivotY( view.getMeasuredHeight()); view.setPivotX( view.getMeasuredWidth()/2); view.setTranslationY( position * view.getHeight()); float scaleFactor = MIN_SCALE + (1 - MIN_SCALE) * (1 - Math.abs(position)); view.setScaleX(scaleFactor); view.setScaleY(scaleFactor); } else if (position <= 1) { // [-1,1] view.setAlpha(1); view.setTranslationX(-view.getWidth() * position); view.setTranslationY( position * view.getHeight()); float scaleFactor = MIN_SCALE + (1 - MIN_SCALE) * (1 - Math.abs(position)); } else { // (1,+Infinity] view.setAlpha(0); view.setTranslationY( position * view.getHeight()); } } }Android是什么
Android是一種基于Linux內(nèi)核的自由及開放源代碼的操作系統(tǒng),主要使用于移動(dòng)設(shè)備,如智能手機(jī)和平板電腦,由美國(guó)Google公司和開放手機(jī)聯(lián)盟領(lǐng)導(dǎo)及開發(fā)。
上述就是小編為大家分享的怎么在android中使用viewpager實(shí)現(xiàn)豎屏滑動(dòng)效果了,如果剛好有類似的疑惑,不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí),歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。