我有一个 Jake Wharton 的 viewpagerindicator，在那个 viewpager 中我有 6 个页面。所有页面都包含 ListView ，我正在用 AsyncTask 加载它们。有时 viewpager 在错误的索引处显示错误的页面。这是我的 viewpager 适配器:

public class TestFragmentAdapter extends FragmentPagerAdapter{
    protected static final String[] CONTENT = new String[] { "a","b","c","d","e","f" };

    private int mCount = CONTENT.length;
    Fragment fragment1,fragment2,fragment3,fragment4,fragment5,fragment6;

    public TestFragmentAdapter(FragmentManager fm) {
        super(fm);
        fragment1 = new CategoryListView();
        fragment2 = CustomizedListviewRecent.newInstance(41);
        fragment3 = CustomizedListviewMostRecents.newInstance(0);
        fragment4 = CustomizedListviewPopulars.newInstance();
        fragment5 = CustomizedListviewRecent.newInstance(42);
        fragment6 = CustomizedListviewRecent.newInstance(43);

    }

    @Override
    public Fragment getItem(int position) {
        if(position == 0)
            return fragment1;
        else if(position == 1)
            return fragment2;
        else if(position == 2)
            return fragment3;
        else if(position == 3)
            return fragment4;
        else if(position == 4)
            return fragment5;
        else
            return fragment6;
    }
    @Override
    public int getCount() {
        return mCount;
    }

    @Override
    public CharSequence getPageTitle(int position) {
      return TestFragmentAdapter.CONTENT[position % CONTENT.length];
    }

    public void setCount(int count) {
        if (count > 0 && count <= 10) {
            mCount = count;
            notifyDataSetChanged();
        }
    }

}

下面是我如何创建我的 viewpager:

public class SampleTitlesDefault extends BaseSampleActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mAdapter = new TestFragmentAdapter(getSupportFragmentManager());

        mPager = (ViewPager)findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);

        mIndicator = (TitlePageIndicator)findViewById(R.id.indicator);
        mIndicator.setViewPager(mPager);
        mIndicator.setCurrentItem(1);
    }

}

这里可能有什么问题？我该如何解决这个问题？谢谢您的帮助

最佳答案

我知道为时已晚，但可能有人需要它。

我也遇到了关于错误位置的类似问题，有时由于错误的位置它在两个 fragment 上显示相同的结果。我通过将 FragmentPagerAdapter 替换为 FragmentStatePagerAdapter

而且我还使用 OnPageChangeListener 接口(interface)从 onPageScrolled 方法传递了索引位置

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


        }

        @Override
        public void onPageSelected(int position) {

            bundle = new Bundle();
            bundle.putInt("position", position);
            primaryFragment.setCurrentPostionAndData(position);

        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });

Like the docs say, think about it this way. If you were to do an application like a book reader, you will not want to load all the fragments into memory at once. You would like to load and destroy Fragments as the user reads. In this case you will use FragmentStatePagerAdapter. If you are just displaying 3 "tabs" that do not contain a lot of heavy data (like Bitmaps), then FragmentPagerAdapter might suit you well. Also, keep in mind that ViewPager by default will load 3 fragments into memory. The first Adapter you mention might destroy View hierarchy and re load it when needed, the second Adapter only saves the state of the Fragment and completely destroys it, if the user then comes back to that page, the state is retrieved.

Difference between FragmentPagerAdapter and FragmentStatePagerAdapter

关于android - Viewpager 显示错误页面，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14540320/