ViewPager+Fragment+BottomBar+组成页面滑动加联动

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;

import com.roughike.bottombar.BottomBar;
import com.roughike.bottombar.OnTabReselectListener;
import com.roughike.bottombar.OnTabSelectListener;

import java.util.ArrayList;

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.bottomBar)
    BottomBar bottomBar;
    @BindView(R.id.vp)
    ViewPager vp;
    private Recommend fragment2;
    private Discover fragment1;
    private ArrayList<Fragment> list;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        list = new ArrayList<>();
        list.add(new Recommend());
        list.add(new Anepisode());
        list.add(new Discover());
        list.add(new Video());

        vp.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {

                return list.get(position);
            }

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

        vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            //滑动时
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }
              //页面选中时
            @Override
            public void onPageSelected(int position) {
                switch (position){
                    case 0:
                        bottomBar.selectTabWithId(R.id.tab_shouye);
                        break;
                    case 1:
                        bottomBar.selectTabWithId(R.id.tab_all);
                        break;
                    case 2:
                        bottomBar.selectTabWithId(R.id.tab_cart);
                        break;
                    case 3:
                        bottomBar.selectTabWithId(R.id.tab_account);
                        break;
                }
            }
//滑动状态改变时
            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

        bottomBar.setOnTabSelectListener(new OnTabSelectListener() {
            @Override
            public void onTabSelected(int tabId) {
                switch (tabId){
                    case R.id.tab_shouye:
                        vp.setCurrentItem(0,false);
                        break;
                    case R.id.tab_all:
                        vp.setCurrentItem(1,false);
                        break;

                    case R.id.tab_cart:
                        vp.setCurrentItem(2,false);
                        break;

                    case R.id.tab_account:
                        vp.setCurrentItem(3,false);
                        break;



                }
            }
        });
    }
}

//布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="9"
        android:id="@+id/vp"
        >

    </android.support.v4.view.ViewPager>

    <com.roughike.bottombar.BottomBar
        android:id="@+id/bottomBar"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:layout_weight="1"
        app:bb_tabXmlResource="@xml/xml"
        android:layout_alignParentBottom="true"
        />

</LinearLayout>

//自建文件夹 在里边创建xml文件如下

<tabs>
    <tab
        id="@+id/tab_shouye"
        title="推荐"
        icon="@drawable/shouye"
        />
    <tab
        id="@+id/tab_all"
        title="段子"
        icon="@drawable/all"

        />
    <tab
        id="@+id/tab_cart"
        title="发现"
        icon="@drawable/cart"

        />
    <tab
        id="@+id/tab_account"
        title="视频"
        icon="@drawable/account"
        />
</tabs>

//bottombar 依赖

implementation 'com.roughike:bottom-bar:2.0.2'

//butterknifr依赖

 implementation 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'