Android botom Navigation Viewpager 效果

1. ViewPagerAdapter

public class TabViewPagerAdapter extends FragmentPagerAdapter {
    private ArrayList<Fragment> fragmentArrayList = new ArrayList<>();

    public TabViewPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return fragmentArrayList.get(position%fragmentArrayList.size());
    }

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

    public void addFragment(Fragment fragment){
        fragmentArrayList.add(fragment);
    }
}

2.佈局文件

<ReleativeLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/contentContainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/bar_title"
        android:layout_above="@+id/bottom_navigation_bar"/>

    <com.ashokvarma.bottomnavigation.BottomNavigationBar
        android:id="@+id/bottom_navigation_bar"
        android:layout_gravity="bottom"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</RelativeLayout>

3.添加兩個監聽

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

            @Override
            public void onPageSelected(int position) {
                mBottomNavigationBar.selectTab(position);

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

mBottomNavigationBar.setTabSelectedListener(new BottomNavigationBar.OnTabSelectedListener() {
            @Override
            public void onTabSelected(int position) {
                mViewPager.setCurrentItem(position);
            }

            @Override
            public void onTabUnselected(int position) {

            }

            @Override
            public void onTabReselected(int position) {

            }
        });