compile 'com.ashokvarma.android:bottom-navigation-bar:1.3.0' 

initBottom(); 
 认选中0 
    showFragment(0); 

 private void showFragment(int position) { 
    FragmentManager supportFragmentManager = getSupportFragmentManager(); 
    FragmentTransaction transaction = supportFragmentManager.beginTransaction(); 
    transaction.replace(R.id.fl_fragment, FragmentFactory.getFragemt(position)).commit(); 
  } 
  private void initBottom() { 
    numberBadgeItem = new BadgeItem() 
//        .setBorderWidth(4) 边框 
        .setBackgroundColor(Color.RED) 
        .setText("6"); 
//        .setHideOnSelect(autoHide.isChecked()); 点中后干掉 
    bntBottom 
        .setActiveColor(R.color.maincolor) 
        .addItem(new BottomNavigationItem(R.drawable.conversation_selected_2, "消息").setBadgeItem(numberBadgeItem)) 
        .addItem(new BottomNavigationItem(R.drawable.contact_selected_2, "联系人")) 
        .addItem(new BottomNavigationItem(R.drawable.plugin_selected_2, "动态")) 
        .setFirstSelectedPosition(0) 
        .initialise(); 
    //监听底部导航 
    bntBottom.setTabSelectedListener(this); 
  } 
  @Override 
  public void onTabSelected(int position) { 
    //当前切换时候调用 
    showFragment(position); 
  }