这招对我很管用:

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener(){

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {       
        conterchange.setText(""+(1+position));
    }

    @Override
    public void onPageSelected(int position) {
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }
});

如果需要，创建一个接口; FragmentLifecycle { onPauseFragment(); onsumefragment (); ｝ 如所示，在viewpager中的每个片段中实现接口

公共类FragmentCast扩展Fragment实现FragmentLifecycle { @Override onPauseFragment() { 日志。我(标签,“onPauseFragment () "); Toast.makeText(getActivity()， "onPauseFragment():" + TAG, Toast.LENGTH_SHORT).show(); ｝ @Override onResumeFragment() { 日志。我(标签,“onResumeFragment () "); Toast.makeText(getActivity()， "onResumeFragment():" + TAG, Toast.LENGTH_SHORT).show(); ｝

List this is how u user the addOnPageListener enter viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { int currentPosition = 0; @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { FragmentLifecycle fragmentLifecycleToShow =(FragmentLifecycle) viewPager.getAdapter().instantiateItem(viewPager, viewPager.getCurrentItem()); fragmentLifecycleToShow.onResumeFragment(); FragmentLifecycle fragmentLifecycleToHide =(FragmentLifecycle) viewPager.getAdapter().instantiateItem(viewPager, currentPosition); fragmentLifecycleToHide.onPauseFragment(); currentPosition = position; } @Override public void onPageScrollStateChanged(int state) { } }); Implement your calls in the onPauseFragment() or onResumeFragment()

以防有人需要kotlin中的解决方案:

viewPager.addOnPageChangeListener (object: ViewPager.OnPageChangeListener {
        override fun onPageScrollStateChanged(state: Int) {
            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        }

        override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        }

        override fun onPageSelected(position: Int) {
            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        }

    })

这招对我很管用:

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener(){

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {       
        conterchange.setText(""+(1+position));
    }

    @Override
    public void onPageSelected(int position) {
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }
});

使用:viewpage。addOnPageChangeListener而不是viewpage . setonpagechangelistener。

你可以通过SimpleOnPageChangeListener来实现 守则如下:

private Fragment page = null;
/** Defining a listener for pageChange */
        ViewPager.SimpleOnPageChangeListener pageChangeListener = new ViewPager.SimpleOnPageChangeListener(){
            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);

                page = getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.pager_selectPhotos + ":" + position);

                System.out.println(page);
                switch (position) {
                case 0:

                    break;
                case 1:

                    break;

                default:
                    break;
                }
            }
        };
        /** Setting the pageChange listener to the viewPager */
        _pager.setOnPageChangeListener(pageChangeListener);