Android viewpager與DepthPageTransformer z-index問題

Question

我用DepthPageTransformer實現了viewpager，在頁面中我有一些輸入（radio，復選框，select options ...）。 除一個有線錯誤外，它工作正常：有時，當我單擊頁面P1上的position（x，y）時，將觸發頁面P2上該位置的輸入。

P1：

P2（P1之后的那個）：

現在，當我單擊頁面P1上的該位置時：

我在頁面P2上顯示了選擇選項：

它類似於Web開發中的z-index問題。

DepthPage Transformer的代碼與文檔中的代碼相同： 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);
    }
}
}

關於如何解決這個重疊問題有什么想法嗎？

Answer 1

嘗試這個：

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

您只需要反向繪制順序：

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

無論如何，您都可以在此處使用代碼示例

Answer 3

其他解決方案是使用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) { }
});

更有效率。