viewpager setonpagechangelistener 已弃用

Question

今天我尝试设置 ViewPager.setOnPageChangeListener，但我发现它已被弃用。

Answer 1

ViewPager.setOnPageChangeListener 现在已弃用。需要使用 ViewPager.addOnPageChangeListener 代替。

例如，

ViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {

        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });

你可以找到这个Here.

Answer 2

你可以通过SimpleOnPageChangeListener实现下面是代码：

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);

Answer 3

使用ViewPager.addOnPageChangeListener代替ViewPager.setOnPageChangeListener.

Answer 4

这对我有用：

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) {
    }
});

Answer 5

以防万一有人需要 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.
        }

    })

Answer 6

如果需要创建接口；

public interface FragmentLifecycle {
public void onPauseFragment();
public void onResumeFragment();

}

在 viewpager 的每个片段中实现接口，如图所示

 public class FragmentCast extends Fragment implements FragmentLifecycle {
  @Override
    public void onPauseFragment() {
        Log.i(TAG, "onPauseFragment()");
        Toast.makeText(getActivity(), "onPauseFragment():" + TAG, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onResumeFragment() {
        Log.i(TAG, "onResumeFragment()");
        Toast.makeText(getActivity(), "onResumeFragment():" + TAG, Toast.LENGTH_SHORT).show();
    }

列出这是您使用 addOnPageListener 的方式

输入viewPager.addOnPageChangeListener(新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) {

    }
});

在 onPauseFragment() 或 onResumeFragment() 中实现您的调用

viewpager setonpagechangelistener 已弃用

viewpager setonpagechangelistener deprecated

android

android-viewpager