Android SimpleOnPageListener未触发

我有这门课：

package com.shopkeep.pocketandroid.Utils;

import android.support.v4.view.ViewPager;
import android.widget.Toast;

import com.shopkeep.pocketandroid.PocketApplication;

public class PageChangeListener extends ViewPager.SimpleOnPageChangeListener {

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        Toast.makeText(PocketApplication.getContext(), "changed" + position, Toast.LENGTH_LONG).show();
    }
}

我在这里使用它：

ViewPagerAdapter adapter =  new ViewPagerAdapter(getSupportFragmentManager(), getTabTitles(), getTabFragments());
ViewPager pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
SlidingTabLayout tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly();

pager.setOnPageChangeListener(new PageChangeListener());
tabs.setViewPager(pager);
pager.setCurrentItem(getDefaultTabIndex());

我能够在选项卡和片段加载之间切换

然而，我并没有看到我的吐司，我在PageChangeListener中设置了一个断点，它并没有被触发

为什么这没有被触发？我希望在页面更改时收到通知

我已经试过了

@Override
public void onPageSelected(int position) {
    Toast.makeText(PocketApplication.getContext(), "changed" + position, Toast.LENGTH_LONG).show();
}

---

也不要吐司。

您需要为

滑动布局设置
而不是viewpager设置
setOnPageChangeListener

更改
pager.setOnPageChangeListener（新的PageChangeListener（））到
选项卡。setOnPageChangeListener（新的PageChangeListener（））

这在
slidengtablayout

 /**
     * Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are
     * required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so
     * that the layout can update it's scroll position correctly.
     *
     * @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener)
     */
    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
        mViewPagerPageChangeListener = listener;
    }

您需要为
slidentablayout
而不是viewpager设置
setOnPageChangeListener

更改
pager.setOnPageChangeListener（新的PageChangeListener（））到
选项卡。setOnPageChangeListener（新的PageChangeListener（））

这在
slidengtablayout

 /**
     * Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are
     * required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so
     * that the layout can update it's scroll position correctly.
     *
     * @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener)
     */
    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
        mViewPagerPageChangeListener = listener;
    }

如果您对onPageSelected感兴趣，请尝试扩展ViewPager.OnPageChangeListener而不是SimpleOnPageChangeListener。Galvan，SimpleOnPageChangeListener就是这么做的。如果您对onPageSelected.Galvan感兴趣，请尝试扩展ViewPager.OnPageChangeListener而不是SimpleOnPageChangeListener，SimpleOnPageChangeListener就是这么做的。