Question

好的，所以场景是这样的。第一次加载ChildFragments时，我可以轻松拨打customMethod()或onCreate()内的onCreateView()。但是，我想要的是当我更改标签时，我想回忆一下我的ChildFragment customMethod() 我怎样才能做到这一点？

ParentFragment

 private void initViewPagerAndTabs() {
        mMinHeaderHeight = getResources().getDimensionPixelSize(R.dimen.flexible_space_image_height_search_dynamic);
        mHeaderHeight = getResources().getDimensionPixelSize(R.dimen.header_height);
        mMinHeaderTranslation = -mMinHeaderHeight + getActionBarHeight();

        mHeaderLogo = (SelectableRoundedImageView) searchFragmntInflater.findViewById(R.id.header_logo);


        mPagerSlidingTabStrip = (PagerSlidingTabStrip) searchFragmntInflater.findViewById(R.id.tabs);

        mViewPager = (ViewPager) searchFragmntInflater.findViewById(R.id.pager);
        mViewPager.setOffscreenPageLimit(1);

        mPagerAdapter = new PagerAdapter(getChildFragmentManager());
        mPagerAdapter.setTabHolderScrollingContent(this);

        mViewPager.setAdapter(mPagerAdapter);

        mPagerSlidingTabStrip.setViewPager(mViewPager);
        mPagerSlidingTabStrip.setOnPageChangeListener(this);


        mHeader = searchFragmntInflater.findViewById(R.id.header);

        mActionBarTitleColor = getResources().getColor(R.color.quinto);
        mAlphaForegroundColorSpan = new AlphaForegroundColorSpan(0xffffffff);
        mSpannableString = new SpannableString(getString(R.string.app_name));
        mAlphaForegroundColorSpan = new AlphaForegroundColorSpan(mActionBarTitleColor);
        mPagerSlidingTabStrip = (PagerSlidingTabStrip) searchFragmntInflater.findViewById(R.id.tabs);

        mViewPager = (ViewPager) searchFragmntInflater.findViewById(R.id.pager);
        mViewPager.setOffscreenPageLimit(4);

        mPagerAdapter = new PagerAdapter(getChildFragmentManager());
        mPagerAdapter.setTabHolderScrollingContent(this);

        mViewPager.setAdapter(mPagerAdapter);

        mPagerSlidingTabStrip.setViewPager(mViewPager);
        mPagerSlidingTabStrip.setOnPageChangeListener(this);


    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
        // nothing

    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        // nothing


    }

    @Override
    public void onPageSelected(int position) {
        SparseArrayCompat<ScrollTabHolder> scrollTabHolders = mPagerAdapter.getScrollTabHolders();
        ScrollTabHolder currentHolder = scrollTabHolders.valueAt(position);

        currentHolder.adjustScroll((int) (mHeader.getHeight() + ViewHelper.getTranslationY(mHeader)));

    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount, int pagePosition) {
        if (mViewPager.getCurrentItem() == pagePosition) {
            int scrollY = getScrollY(view);
            ViewHelper.setTranslationY(mHeader, Math.max(-scrollY, mMinHeaderTranslation));
            float ratio = clamp(ViewHelper.getTranslationY(mHeader) / mMinHeaderTranslation, 0.0f, 1.0f);

            // interpolate(mHeaderLogo, getActionBarIconView(), sSmoothInterpolator.getInterpolation(ratio));
            //setTitleAlpha(clamp(5.0F * ratio - 4.0F, 0.0F, 1.0F));
        }
    }

    @Override
    public void adjustScroll(int scrollHeight) {
        // nothing
    }

    public int getScrollY(AbsListView view) {
        View c = view.getChildAt(0);
        if (c == null) {
            return 0;
        }

        int firstVisiblePosition = view.getFirstVisiblePosition();
        int top = c.getTop();

        int headerHeight = 0;
        if (firstVisiblePosition >= 1) {
            headerHeight = mHeaderHeight;
        }

        return -top + firstVisiblePosition * c.getHeight() + headerHeight;
    }


    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public int getActionBarHeight() {
        if (mActionBarHeight != 0) {
            return mActionBarHeight;
        }

        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB) {
            getActivity().getTheme().resolveAttribute(android.R.attr.actionBarSize, mTypedValue, true);
        } else {
            getActivity().getTheme().resolveAttribute(R.attr.actionBarSize, mTypedValue, true);
        }

        mActionBarHeight = TypedValue.complexToDimensionPixelSize(mTypedValue.data, getResources().getDisplayMetrics());

        return mActionBarHeight;
    }


    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private ImageView getActionBarIconView() {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            return (ImageView) getActivity().findViewById(android.R.id.home);
        }

        return (ImageView) getActivity().findViewById(android.support.v7.appcompat.R.id.home);
    }


public class PagerAdapter extends FragmentPagerAdapter {

    private final String[] TITLES = {"ChildFragment1", "ChildFragment2", "ChildFragment3"};
    private SparseArrayCompat<ScrollTabHolder> mScrollTabHolders;
    private ScrollTabHolder mListener;

    public PagerAdapter(FragmentManager fm) {
        super(fm);
        mScrollTabHolders = new SparseArrayCompat<ScrollTabHolder>();
    }

    @Override
    public int getItemPosition(Object object) {
        // POSITION_NONE makes it possible to reload the PagerAdapter
        return POSITION_NONE;
    }

    public void setTabHolderScrollingContent(ScrollTabHolder listener) {
        mListener = listener;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return TITLES[position];
    }

    @Override
    public int getCount() {
        return TITLES.length;
    }

    @Override
    public Fragment getItem(int position) {

        if (position == 0) {
            fragment = (ScrollTabHolderFragment) ChildFragment1.newInstance(position, "");
        } else if (position == 1) {
            fragment = (ScrollTabHolderFragment) ChildFragment2.newInstance(position, "");
        } else {
            fragment = (ScrollTabHolderFragment) ChildFragment3.newInstance(position, "");
        }
        mScrollTabHolders.put(position, fragment);
        if (mListener != null) {
            fragment.setScrollTabHolder(mListener);
        }

        return fragment;
    }

    public SparseArrayCompat<ScrollTabHolder> getScrollTabHolders() {
        return mScrollTabHolders;
    }

}

儿童片段

   public static ChildFragment1 newInstance(int position, String query) {
            ChildFragment1 f = new ChildFragment1();
            Bundle b = new Bundle();
            b.putInt(ARG_POSITION, position);


            f.setArguments(b);
            return f;
        }
     @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mPosition = getArguments().getInt(ARG_POSITION);


    }
    customMethod(){
    //This method returns an arraylist data

}

Answer 1

所以，我遵循了Gatunox的建议，并将我的自定义方法设为静态。现在，我可以通过直接从newinstance（）方法调用我的自定义方法来刷新我的片段数据。

在标签更改上重新加载片段 - Android

1 个答案: