如何在垂直浏览页中滑动 5 次后展示 Admob 插页式广告

Question

我制作了一个应用程序，其中我添加了使用ViewPager类垂直滑动的功能。现在，我需要帮助才能在滑动 5 次后展示 AdMob 插页式广告。我看到了其他几个SO问题，但无法澄清。

谁能帮我怎么做？这是我的代码：

主活动

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mains);  
        mData = dbHelper.getAll(Data.class);
        DATA_CARDS = mData.size();
        ScreenSlidePagerAdapter screenSlidePagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
        VerticalViewPager verticalViewPager = (VerticalViewPager) findViewById(R.id.pager);
        verticalViewPager.setAdapter(screenSlidePagerAdapter);      
    }

屏幕幻灯片寻呼机适配器

public class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
    private static final int NUM_PAGES = MainActivity.DATA_CARDS;
    public ScreenSlidePagerAdapter(FragmentManager fm) {
        super(fm);
    }
    @Override
    public Fragment getItem(int position) {
        SlidingFragment slidingFragment = new SlidingFragment();
        Bundle bundle = new Bundle();
        bundle.putInt("position", position);
        slidingFragment.setArguments(bundle);
        return slidingFragment;
    }
    @Override
    public int getCount() {
        return NUM_PAGES;
    }
}

垂直视图寻呼机

    public class VerticalViewPager extends ViewPager {
    public VerticalViewPager(Context context) {
        super(context);
        init();
    }
    public VerticalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    private void init() {
        setPageTransformer(true, new VerticalPageTransformer());]
        setOverScrollMode(OVER_SCROLL_NEVER);
    }
    private class VerticalPageTransformer implements ViewPager.PageTransformer {
        @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 <= 1) { // [-1,1]
                view.setAlpha(1);
                // Counteract the default slide transition
                view.setTranslationX(view.getWidth() * -position);
                //set Y position to swipe in from top
                float yPosition = position * view.getHeight();
                view.setTranslationY(yPosition);
            } else { // (1,+Infinity]
                // This page is way off-screen to the right.
                view.setAlpha(0);
            }
        }
    }
    /**
     * Swaps the X and Y coordinates of your touch event.
     */
    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;
    }
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return super.onTouchEvent(swapXY(ev));
    }
}

Answer 1

您可以将PageChangeListener添加到视图寻呼机并调用onPageSelected()调用，为此您需要调用类字段，例如 int mAdCounter = 0 ：

verticalViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        }
        @Override
        public void onPageSelected(int position) {
            mAdCount++;
            if (mAdCount % 5 == 0) {
            //Display your add
            //It's better if you load the ad before you need to display it, you can hide the adview and load it
            } else {
            //Hide the adView
            }
        }
        @Override
        public void onPageScrollStateChanged(int state) {
        }
    });