片段移动时 ViewPager 消失答案

【问题标题】：ViewPager disapear when fragment move片段移动时 ViewPager 消失
【发布时间】：2017-07-17 20:02:41
【问题描述】：

我已经用过了

getChildFragmentManager 和 CustomPager

但是当我移动片段时，我的视图寻呼机总是消失。

这是我的 setupViewPager

private void setupViewPager(ViewPager viewPager) {
    MyPagerAdapter adapter = new MyPagerAdapter(getChildFragmentManager());
    adapter.addFragment(new PulsaFragment(), "Pulsa");
    adapter.addFragment(new TelkomFragment(), "Telkom");
    adapter.addFragment(new BPJSFragment(), "BPJS");
    adapter.addFragment(new ListrikFragment(), "Listrik");
    viewPager.setAdapter(adapter);
}

和我的PagerAdapter

class MyPagerAdapter extends FragmentPagerAdapter {

    private List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();
    private int mCurrentPosition = -1;

    @Override
    public void setPrimaryItem(ViewGroup container, int position, Object object) {
        super.setPrimaryItem(container, position, object);
        if (position != mCurrentPosition) {
            Fragment fragment = (Fragment) object;
            CustomPager pager = (CustomPager) container;
            if (fragment != null && fragment.getView() != null) {
                mCurrentPosition = position;
                pager.measureCurrentView(fragment.getView());
            }
        }
    }

    MyPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }

}

请帮帮我:) 我试过this 但它不起作用..

【问题讨论】：

i move the fragment 这是什么意思？你是怎么移动它的？
以上代码运行良好。

标签： android android-fragments

【解决方案1】：

试试这个

class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}

【讨论】：