compile 'com.android.support:appcompat-v7:23.0.0'  compile 'com.android.support:design:23.+'  compile 'com.roughike:bottom-bar:1.3.+'

public class Menu1Activity extends AppCompatActivity {private BottomBar mBottomBar;private MainFragment mMainFragment;private TwoFragment twoFragment;private ThreeFragment threeFragment;private FourFragment fourFragment;private FragmentTransaction transaction;private BottomBarBadge unreadMessages;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_menu);mBottomBar = BottomBar.attach(this, savedInstanceState);// 千万注意：这个方法要用在 setItemsFromMenu 之前，也就是tab还没有设置之前要先调用，不然会报错。
        mBottomBar.noTabletGoodness();//添加初始FragmentdefaultFragment(null == mMainFragment ? mMainFragment = MainFragment.newInstance() : mMainFragment);mBottomBar.setItems(R.menu.bottombar_menu);mBottomBar.setOnMenuTabClickListener(new OnMenuTabClickListener() {@Overridepublic void onMenuTabSelected(@IdRes int menuItemId) {//单击事件 menuItemId 是 R.menu.bottombar_menu 中 item 的 idswitch (menuItemId) {case R.id.bb_menu_main:if (null == mMainFragment) {mMainFragment = MainFragment.newInstance();}replaceFragment(mMainFragment);break;case R.id.bb_menu_chart:if (null == twoFragment) {twoFragment = TwoFragment.newInstance();}replaceFragment(twoFragment);unreadMessages.setVisibility(View.GONE);break;case R.id.bb_menu_timeline:if (null == threeFragment) {threeFragment = ThreeFragment.newInstance();}replaceFragment(threeFragment);break;case R.id.bb_menu_about:if (null == fourFragment) {fourFragment = FourFragment.newInstance();}replaceFragment(fourFragment);break;default:break;}}@Overridepublic void onMenuTabReSelected(@IdRes int menuItemId) {//重选事件，当前已经选择了这个，又点了这个tab。微博点击首页刷新页面
            }});// 当点击不同按钮的时候，设置不同的颜色// 可以用以下三种方式来设置颜色.mBottomBar.mapColorForTab(0, ContextCompat.getColor(this, R.color.colorPrimary));mBottomBar.mapColorForTab(1, ContextCompat.getColor(this, R.color.colorAccent));mBottomBar.mapColorForTab(2, ContextCompat.getColor(this, R.color.green));mBottomBar.mapColorForTab(3, ContextCompat.getColor(this, R.color.orange));setMsg();}@Overrideprotected void onSaveInstanceState(Bundle outState) {super.onSaveInstanceState(outState);//保存BottomBar的状态
        mBottomBar.onSaveInstanceState(outState);}private void replaceFragment(Fragment fragment) {FragmentManager fm = getSupportFragmentManager();transaction = fm.beginTransaction();transaction.replace(R.id.main_fragment_layout, fragment);
//        transaction.hide();
        transaction.commit();}private void defaultFragment(Fragment fragment) {FragmentManager fm = getSupportFragmentManager();transaction = fm.beginTransaction();transaction.add(R.id.main_fragment_layout, fragment);transaction.commit();}private void setMsg() {// 为tab设置一个标签，“信息”提示的数字// 参数分别是：第几个tab；小圆圈的颜色；显示的数字unreadMessages = mBottomBar.makeBadgeForTabAt(1, "#FF0000", 13);// 设置显示或隐藏
        unreadMessages.show();
//        unreadMessages.hide();// 设置显示的数字unreadMessages.setCount(4);// 设置显示/消失动画的延迟时间unreadMessages.setAnimationDuration(200);// 如果不点它，它一直显示unreadMessages.setAutoShowAfterUnSelection(true);}