compile'com.ashokvarma.android:bottom-navigation-bar:1.2.0'

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">

  <FrameLayout
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"/>

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

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:gravity="center">

  <TextView
    android:text="主页"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</LinearLayout>

public class MainActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener {

  BottomNavigationBar mBottomNavigationBar;
  private IndexFragment indexFragment;
  private MapFragment mapFragment;
  private LoveFragment loveFragment;
  private PersonFragment personFragment;
  private BadgeItem badgeItem;

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

  private void InitNavigationBar() {
    mBottomNavigationBar = (BottomNavigationBar)findViewById(R.id.bottom_navigation_bar);
    mBottomNavigationBar.setTabSelectedListener(this);
    mBottomNavigationBar.setMode(BottomNavigationBar.MODE_SHIFTING);
    mBottomNavigationBar.setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_RIPPLE);
    mBottomNavigationBar
        .addItem(new BottomNavigationItem(R.drawable.icon_index,"首页").setActiveColorResource(R.color.red))
        .addItem(new BottomNavigationItem(R.drawable.icon_map,"地图").setActiveColorResource(R.color.blue))
        .addItem(new BottomNavigationItem(R.drawable.icon_love,"关注").setActiveColorResource(R.color.yellow).setBadgeItem(badgeItem))
        .addItem(new BottomNavigationItem(R.drawable.icon_person,"个人").setActiveColorResource(R.color.green))
        .setFirstSelectedPosition(0)
        .initialise();
  }

  public void initBadge()
  {
    badgeItem = new BadgeItem()
          .setBorderWidth(2)
          .setBorderColor("#ff0000")
          .setBackgroundColor("#ff0000")
          .setGravity(Gravity.RIGHT| Gravity.TOP)
          .setText("2")
          .setTextColor("#ffffff")
          .setAnimationDuration(2000)
          .setHideOnSelect(true);
  }
  private void setDefaultFragment() {
    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction transaction = fm.beginTransaction();
    indexFragment = new IndexFragment();
    transaction.replace(R.id.fragment_container, indexFragment);
    transaction.commit();
  }

  @Override
  public void onTabSelected(int position) {
    Log.d("onTabSelected", "onTabSelected: " + position);
    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction transaction = fm.beginTransaction();
    switch (position) {
      case 0:
        if (indexFragment == null) {
          indexFragment = new IndexFragment();
        }
        transaction.replace(R.id.fragment_container, indexFragment);
        break;
      case 1:
        if (mapFragment== null) {
          mapFragment = new MapFragment();
        }
        transaction.replace(R.id.fragment_container, mapFragment);
        break;
      case 2:
        if (loveFragment == null) {
          loveFragment = new LoveFragment();
        }
        transaction.replace(R.id.fragment_container,loveFragment);
        break;
      case 3:
        if (personFragment == null) {
          personFragment = new PersonFragment();
        }
        transaction.replace(R.id.fragment_container,personFragment);
        break;
      default:
        break;
    }
    // 事务提交
    transaction.commit();
  }

  @Override
  public void onTabUnselected(int position) {
    Log.d("onTabUnselected", "onTabUnselected: " + position);
  }

  @Override
  public void onTabReselected(int position) {
    Log.d("onTabReselected", "onTabReselected: " + position);
  }
}