我开发了一种在应用程序中选择员工的滚动机制。它是自定义 View 寻呼机，允许每次在屏幕上显示一个以上的项目(在我的例子中是 3 个)，并且两侧都被阴影包围。

在 Nexus 5、Nexus 4、Galaxy S3 等设备上，它的外观和工作方式如下:

但是在某些设备上，例如(Sony Xperia，以及不同类型的Motorola)，渲染看起来很糟糕，结果如下:

关于我在 @Commonsware 这篇博文中提到的代码:

http://commonsware.com/blog/2012/08/20/multiple-view-viewpager-options.html

第三个选项你可以找到哪些代码here .

这是我的相关代码:

PagerContainer:

    public class PagerContainer extends FrameLayout implements ViewPager.OnPageChangeListener {

    private ViewPager mPager;
    boolean mNeedsRedraw = false;

    public PagerContainer(Context context) {
        super(context);
        init();
    }

    public PagerContainer(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public PagerContainer(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        //Disable clipping of children so non-selected pages are visible
        setClipChildren(false);

        //Child clipping doesn't work with hardware acceleration in Android 3.x/4.x
        //You need to set this value here if using hardware acceleration in an
        // application targeted at these releases.
        if (Build.VERSION.SDK_INT >= 11 && Build.VERSION.SDK_INT < 19)
        {
            setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }
    }

    @Override
    protected void onFinishInflate() {
        try {
            mPager = (ViewPager) getChildAt(0);
            mPager.setOnPageChangeListener(this);
        } catch (Exception e) {
            throw new IllegalStateException("The root child of PagerContainer must be a ViewPager");
        }
    }

    public ViewPager getViewPager() {
        return mPager;
    }

    private Point mCenter = new Point();
    private Point mInitialTouch = new Point();

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        mCenter.x = w / 2;
        mCenter.y = h / 2;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        //We capture any touches not already handled by the ViewPager
        // to implement scrolling from a touch outside the pager bounds.
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mInitialTouch.x = (int)ev.getX();
                mInitialTouch.y = (int)ev.getY();
            default:
                ev.offsetLocation(mCenter.x - mInitialTouch.x, mCenter.y - mInitialTouch.y);
                break;
        }

        return mPager.dispatchTouchEvent(ev);
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        //Force the container to redraw on scrolling.
        //Without this the outer pages render initially and then stay static
        if (mNeedsRedraw) invalidate();
    }

    @Override
    public void onPageSelected(int position) { 
        invalidate();
    }

    @Override
    public void onPageScrollStateChanged(int state) {
        mNeedsRedraw = (state != ViewPager.SCROLL_STATE_IDLE);
    }
}

初始化部分:

  //Size View Pager:
    //========================================
    pagerSize = mContainerSize.getViewPager();
    adapter = new MySizePagerAdapter();
    pagerSize.setAdapter(adapter);
    //Necessary or the pager will only have one extra page to show  make this at least however many pages you can see
    pagerSize.setOffscreenPageLimit(adapter.getCount());
    //A little space between pages
    pagerSize.setPageMargin(15);
    //If hardware acceleration is enabled, you should also remove  clipping on the pager for its children.
    pagerSize.setClipChildren(false);

更多的研究让我了解到这个问题与硬件加速或某些设备中缺少硬件加速有关。但是通过代码禁用它也没有帮助我。

最佳答案

我会尝试将 ViewPager 的 layerType 及其子项设置为软件渲染，而不是父框架布局。

您可能还想看看这篇博文:http://udinic.wordpress.com/2013/09/16/viewpager-and-hardware-acceleration/

关于android - 某些设备上的自定义 ViewPager 渲染问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21269364/