如何在特定片段上隐藏FAB [英] How to hide FAB on a particular fragment

问题描述

好吧，我只想在特定片段上删除/隐藏FAB，在我的情况下为历史记录"标签.

Well I want to remove/hide FAB only on a particular fragment , HISTORY tab in my case .

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        .... (Overriding methods , I didnt do anything here
        });

我使View Pager膨胀的方法

My methods for inflating View Pager

private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(new HistoryFragment(), "HISTORY");
        adapter.addFragment(new TransactionFragment(), "CURRENT");
        adapter.addFragment(new FutureFragment(), "FUTURE");

        viewPager.setAdapter(adapter);

    }

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 android.support.v4.app.Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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

    public void addFragment(android.support.v4.app.Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

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

我应该在哪里以及如何更改代码以在历史记录"标签/片段中隐藏我的FAB，然后在其他标签上再次显示

Where and how should I make changes to my code to Hide my FAB from the HISTORY tab/fragment and show again on other Tabs

推荐答案

我认为它是如此简单:

viewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            if(position == 0) {
               // hide FAB
            } else {
               // show FAB
            }
        }
}

您可以做很多清理工作以改善维护，例如为每个页面分配页码，例如:

You can do a lot of cleanup to improve maintenance like assign page numbers to each page like:

private static final int PAGE_HISTORY = 0;
private static final int PAGE_TRANSACTION = 1;
private static final int PAGE_FUTURE = 2;

因此，您说的是if(position == PAGE_HISTORY)，而不是if(position == 0).这样，如果您要更改页面，则无需更改大量代码.

So instead of if(position == 0) you say if(position == PAGE_HISTORY). That way you don't have to change a lot of code if you ever change your pages around.

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