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

initBottom();  認選中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) 邊框         .setBackgroundColor(Color.RED)         .setText("6"); //        .setHideOnSelect(autoHide.isChecked()); 點中后干掉     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, "聯系人"))         .addItem(new BottomNavigationItem(R.drawable.plugin_selected_2, "動態"))         .setFirstSelectedPosition(0)         .initialise();     //監聽底部導航     bntBottom.setTabSelectedListener(this);   }   @Override   public void onTabSelected(int position) {     //當前切換時候調用     showFragment(position);   }