Android实现ScrollView+tablayout+viewpager+recyclerview页面展示数据，解决viewpager底部空白问题

1：新建一个MyScrollview继承Scrollview可实现tablayout标题置顶

public class MyScrollview extends ScrollView {

    private ScrollViewListener scrollViewListener = null;

    public MyScrollview(Context context) {
        super(context);
    }

    public MyScrollview(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyScrollview(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public void setScrollViewListener(ScrollViewListener scrollViewListener) {
        this.scrollViewListener = scrollViewListener;
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        if (scrollViewListener != null) {
            scrollViewListener.onScrollChanged(this, l, t, oldl, oldt);
        }
    }

    public interface ScrollViewListener {
        void onScrollChanged(MyScrollview scrollView, int l, int t, int oldl, int oldt);
    }
}

2：新建viewpager计算页面高度

public class CustomViewPager extends ViewPager {

    private int current;
    private int height = 0;
    /**
     * 保存position与对于的View
     */
    private HashMap mChildrenViews = new LinkedHashMap();

    private boolean scrollble = true;

    public CustomViewPager(Context context) {
        super(context);
    }

    public CustomViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mChildrenViews.size() > current) {
            View child = mChildrenViews.get(current);
            if (child != null) {
                child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
                height = child.getMeasuredHeight();
            }
        }

        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    public void resetHeight(int current) {
        this.current = current;
        if (mChildrenViews.size() > current) {

            LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) getLayoutParams();
            if (layoutParams == null) {
                layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, height);
            } else {
                layoutParams.height = height;
            }
            setLayoutParams(layoutParams);
        }
    }

    /**
     * 保存position与对于的View
     */
    public void setObjectForPosition(View view, int position) {
        mChildrenViews.put(position, view);
    }


    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (!scrollble) {
            return true;
        }
        return super.onTouchEvent(ev);
    }


    public boolean isScrollble() {
        return scrollble;
    }

    public void setScrollble(boolean scrollble) {
        this.scrollble = scrollble;
    }


}

3：主页面布局：包含myscrollview+tablayout+viewpager

4：MainActivity中

public class Main2Activity extends AppCompatActivity {

    CustomViewPager mViewPager;
    List mFragments;

    String[] mTitles = new String[]{
            "主页", "微博", "相册"
    };
    private TabLayout mTabLayout;
    private MyScrollview scroll;
    private LinearLayout layout;
    private RelativeLayout rl_layout;
    private LinearLayout iv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        // 第一步，初始化ViewPager和TabLayout
        mViewPager = (CustomViewPager) findViewById(R.id.viewpager);
        mTabLayout = (TabLayout) findViewById(R.id.tabs);
        layout = (LinearLayout) findViewById(R.id.layout);
        rl_layout = (RelativeLayout) findViewById(R.id.rl_layout);
        scroll = (MyScrollview) findViewById(R.id.scroll);
        iv = (LinearLayout) findViewById(R.id.iv);
        setupViewPager();
    }


    private void setupViewPager() {

        mFragments = new ArrayList<>();
        ListFragment listFragment = new ListFragment(mViewPager, 0);
        ListFragment2 listFragment2 = new ListFragment2(mViewPager, 1);
        ListFragment3 listFragment3 = new ListFragment3(mViewPager, 2);
        mFragments.add(listFragment);
        mFragments.add(listFragment2);
        mFragments.add(listFragment3);

        // 第二步：为ViewPager设置适配器
        BaseFragmentAdapter adapter =
                new BaseFragmentAdapter(getSupportFragmentManager(), mFragments, mTitles);

        mViewPager.setAdapter(adapter);
        //  第三步：将ViewPager与TableLayout 绑定在一起
        mTabLayout.setupWithViewPager(mViewPager);

        mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }

            @Override
            public void onPageSelected(int position) {
                mViewPager.resetHeight(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {
            }
        });

        scroll.setScrollViewListener(new MyScrollview.ScrollViewListener() {
            @Override
            public void onScrollChanged(MyScrollview scrollView, int l, int t, int oldl, int oldt) {
            //计算高度置顶标题
                if (t > iv.getHeight() && mTabLayout.getParent() == layout) {
                    layout.removeView(mTabLayout);
                    rl_layout.addView(mTabLayout);
                } else if (t < iv.getHeight() && mTabLayout.getParent() == rl_layout) {
                    rl_layout.removeView(mTabLayout);
                    layout.addView(mTabLayout);
                }
            }
        });

    }
}

5：viewpager适配器

public class BaseFragmentAdapter extends FragmentPagerAdapter {

    protected List mFragmentList;

    protected String[] mTitles;

//    public BaseFragmentAdapter(FragmentManager fm) {
//        this(fm, null, null);
//    }

    public BaseFragmentAdapter(FragmentManager fm, List fragmentList, String[] mTitles) {
        super(fm);
        if (fragmentList == null) {
            fragmentList = new ArrayList<>();
        }
        this.mFragmentList = fragmentList;
        this.mTitles = mTitles;
    }

//    public void add(Fragment fragment) {
//        if (isEmpty()) {
//            mFragmentList = new ArrayList<>();
//
//        }
//        mFragmentList.add(fragment);
//    }

    @Override
    public Fragment getItem(int position) {
        //        Logger.i("BaseFragmentAdapter position=" +position);
        return isEmpty() ? null : mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return isEmpty() ? 0 : mFragmentList.size();
    }

    public boolean isEmpty() {
        return mFragmentList == null;

    }

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

    /*  @Override
    public int getItemPosition(Object object) {
        return PagerAdapter.POSITION_NONE;
    }*/


}

6：fragment三个一样写法，布局中recyclerview控件

public class ListFragment extends Fragment {

    RecyclerView mRecyclerView;
    private static final String KEY = "key";
    private String title = "数据";

    List mDatas = new ArrayList<>();
    private View mView;
    private Context mContext;
    private ItemAdapter mAdapter;
    private CustomViewPager vp;
    private int fragment_ID;


    public ListFragment(CustomViewPager viewPager, int fragmentID) {
        vp = viewPager;
        fragment_ID = fragmentID;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        if (mView == null) {
            mContext = getActivity();
            mView = View.inflate(mContext, R.layout.fragment_list, null);
            initView(mView);
        } else {
            ViewGroup parent = (ViewGroup) mView.getParent();
            if (parent != null) {
                parent.removeView(mView);
            }
        }
        vp.setObjectForPosition(mView, fragment_ID);
        return mView;
    }

    protected void initView(View view) {
        Bundle arguments = getArguments();
        if (arguments != null) {
            title = arguments.getString(KEY);
        }
        mRecyclerView = view.findViewById(R.id.recyclerView);

        LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
        DividerItemDecoration itemDecoration = new DividerItemDecoration(getContext(),
                LinearLayoutManager.VERTICAL);
        mRecyclerView.addItemDecoration(itemDecoration);
        mRecyclerView.setLayoutManager(layoutManager);

        for (int i = 0; i < 20; i++) {
            String s = String.format("我是第1个页面第%d条" + title, i);
            mDatas.add(s);
        }

        mAdapter = new ItemAdapter(mContext, mDatas);
        mRecyclerView.setAdapter(mAdapter);

    }

    @Override
    public void onResume() {
        super.onResume();

    }

}