Google最近添加到Material design中的底部导航栏BottomNavigationBar，也可以说是现今Android底部导航栏的一个标准与统一吧。
效果图：

20160615211256_617.gif

使用步骤：

• 在Gradle添加:

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

• 在你的activity xml :

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

• 在你要使用的class中

BottomNavigationBar bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);
bottomNavigationBar 
      .addItem(new BottomNavigationItem(R.drawable.ic_home_white_24dp, "Home")) 
      .addItem(new BottomNavigationItem(R.drawable.ic_book_white_24dp, "Books")) 
      .addItem(new BottomNavigationItem(R.drawable.ic_music_note_white_24dp, "Music")) 
      .addItem(new BottomNavigationItem(R.drawable.ic_tv_white_24dp, "Movies & TV")) 
      .addItem(new BottomNavigationItem(R.drawable.ic_videogame_asset_white_24dp, "Games")) 
      .initialise();

• 添加TabSelectedListener

bottomNavigationBar.setTabSelectedListener(new BottomNavigationBar.OnTabSelectedListener(){ 
    @Override public void onTabSelected(int position) {
    } 
    @Override public void onTabUnselected(int position) { 
    } 
    @Override public void onTabReselected(int position) { 
    } 
});

所有方法靠自己实现

BottomNavigationBar自定义

• 设置导航栏模式

Attribute: bnbMode Values: mode_default, mode_fixed, mode_shifting
Method: setMode() Values:MODE_DEFAULT, MODE_FIXED, MODE_SHIFTING

分别是属性或者代码设置

 bottomNavigationBar
            .setMode(BottomNavigationBar.MODE_FIXED)；

• 设置导航栏背景

Attribute: bnbBackgroundStyle
Values: background_style_default, background_style_static, background_style_ripple
Method: setBackgroundStyle()
Values: BACKGROUND_STYLE_DEFAULT, BACKGROUND_STYLE_STATIC, BACKGROUND_STYLE_RIPPLE

bottomNavigationBar 
          .setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_RIPPLE)

注：模式跟背景的设置都要在添加tab前面。

• 设置颜色

Attributes: bnbActiveColor, bnbInactiveColor, bnbBackgroundColor Value: Color value or resourceMethods: setActiveColor, setInActiveColor, setBarBackgroundColor Value: Color value or resource

bottomNavigationBar 
    .setActiveColor(R.color.primary) 
    .setInActiveColor("#FFFFFF") 
    .setBarBackgroundColor("#ECECEC")

• 添加标记

BadgeItem numberBadgeItem = new BadgeItem() 
    .setBorderWidth(4) .
    .setBackgroundColorResource(R.color.blue) 
    .setText("5") 
    .setHideOnSelect(autoHide.isChecked()); 
bottomNavigationBar .addItem(new BottomNavigationItem(R.drawable.ic_home_white_24dp, "Home")
    .setActiveColorResource(R.color.orange)
    .setBadgeItem(numberBadgeItem))

隐藏/显示
BottomNavigatinoBar可以通过代码在任何时间隐藏或显示

bottomNavigationBar.hide();
bottomNavigationBar.show();

参考：
https://github.com/Ashok-Varma/BottomNavigation
BottomNavigationBar实现Android特色底部导航栏