Android使用BottomNavigationView及ViewPager布局

• 新建android工程，选Bottom Navigation Actvity项
• 使用向导新建三个Fragment(Blank)
• 编辑activity_main.xml
  • 增加ViewPager，并设置id,（Design>Containers>ViewPager)
• 编辑navigation.xml，给每个菜单增加 android:orderInCategory="0" 序号依次增加
• 编辑MainActivity

  ViewPager viewpager
  ViewPager.OnPageChangeListener
  navigation.getMenu().getItem(position).setChecked(true);
  viewpager.setCurrentItem(item.getOrder());
  List<Fragment> fragmentList =new ArrayList<Fragment>();
  

• 分编辑 BlankFragment中的文字内容

代码

MainActivity

public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener ,BlankFragment.OnFragmentInteractionListener,BlankFragment2.OnFragmentInteractionListener,BlankFragment3.OnFragmentInteractionListener{
    private BottomNavigationView navigation;
    private ViewPager viewpager;
    private List<Fragment> fragmentList  =new ArrayList<Fragment>();

    private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
            = new BottomNavigationView.OnNavigationItemSelectedListener() {

        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
            viewpager.setCurrentItem(item.getOrder());
            return false;
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        navigation = (BottomNavigationView) findViewById(R.id.navigation);
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

        viewpager =(ViewPager)findViewById(R.id.viewpager);
        viewpager.addOnPageChangeListener(this);

        Fragment fragment1 = new BlankFragment();
        Fragment fragment2 = new BlankFragment2();
        Fragment fragment3 = new BlankFragment3();
        fragmentList.add(fragment1);
        fragmentList.add(fragment2);
        fragmentList.add(fragment3);


        viewpager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return fragmentList.get(position);
            }

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

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {
        navigation.getMenu().getItem(position).setChecked(true);
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }

    @Override
    public void onFragmentInteraction(Uri uri) {

    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="0dp"
        android:layout_marginStart="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/navigation" />

</android.support.constraint.ConstraintLayout>