Android viewpager 与 DepthPageTransformer z-index 问题

Question

我用 DepthPageTransformer 实现了一个 viewpager，在页面中我有一些输入（收音机、复选框、select 选项 ...）。它工作正常，除了一个有线错误：有时当我点击页面 P1 上的位置（x，y）时，页面 P2 的那个位置的输入被触发。

P1：

P2(P1之后的那个):

现在当我点击页面 P1 上的这个位置时：

我得到 P2 页面显示的 select 选项：

类似于web开发中的z-index问题

DepthPage 转换器的代码与文档中的代码相同：http://developer.android.com/training/animation/screen-slide.html#pagetransformer。

public class DepthPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.75f;
@Override
public void transformPage(View view, float position) {
    int pageWidth = view.getWidth();

    if (position < -1) { // [-Infinity,-1)
        // This page is way off-screen to the left.
        view.setAlpha(0);

    } else if (position <= 0) { // [-1,0]
        // Use the default slide transition when moving to the left page
        view.setAlpha(1);
        view.setTranslationX(0);
        view.setScaleX(1);
        view.setScaleY(1);

    } else if (position <= 1) { // (0,1]
        // Fade the page out.
        view.setAlpha(1 - position);

        // Counteract the default slide transition
        view.setTranslationX(pageWidth * -position);

        // Scale the page down (between MIN_SCALE and 1)
        float scaleFactor = MIN_SCALE
                + (1 - MIN_SCALE) * (1 - Math.abs(position));
        view.setScaleX(scaleFactor);
        view.setScaleY(scaleFactor);

    } else { // (1,+Infinity]
        // This page is way off-screen to the right.
        view.setAlpha(0);
    }
}
}

知道如何解决这个重叠问题吗？

Answer 1

试试这个：

public class DepthPageTransformer implements ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.75f;
@Override
public void transformPage(View view, float position) {
    int pageWidth = view.getWidth();

if (position < -1) { // [-Infinity,-1)
    // This page is way off-screen to the left.
    view.setAlpha(0);

} else if (position <= 0) { // [-1,0]
    // Use the default slide transition when moving to the left page
    view.setAlpha(1);
    view.setTranslationX(0);
    view.setScaleX(1);
    view.setScaleY(1);
    // -------- THIS LINE ---
    view.bringToFront();
    // -------- THIS LINE ---

} else if (position <= 1) { // (0,1]
    // Fade the page out.
    view.setAlpha(1 - position);

    // Counteract the default slide transition
    view.setTranslationX(pageWidth * -position);

    // Scale the page down (between MIN_SCALE and 1)
    float scaleFactor = MIN_SCALE
            + (1 - MIN_SCALE) * (1 - Math.abs(position));
    view.setScaleX(scaleFactor);
    view.setScaleY(scaleFactor);

} else { // (1,+Infinity]
    // This page is way off-screen to the right.
    view.setAlpha(0);
}
}
}

Answer 2

其他解决方案是使用 OnPageChangeListener:

pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { }
    @Override public void onPageSelected(final int position) {
        pager.postDelayed(new Runnable() {
            @Override
            public void run() {
                pagerAdapter.getItem(position).getView().bringToFront();
            }
        }, 300);
    }
    @Override public void onPageScrollStateChanged(int state) { }
});

效率更高。

Answer 3

您只需要反转绘制顺序：

        mPager.setPageTransformer(true, new DepthPageTransformer());

在任何情况下，您都可以玩代码示例 here

Android viewpager 与 DepthPageTransformer z-index 问题

Android viewpager with DepthPageTransformer z-index issue

android

android-layout

android-viewpager

android-animation