一. BottomNavgationBar简介

鉴于官方BottomNavigationView还不是很完善，在此就先使用大佬们做的第三方库
本文讲的是Ashok-Varma的BottomNavigation
先看效果：

Default默认效果

FIXED+STATIC

FIXED+RIPPLE

SHIFTING+RIPPLE

2.3使用步骤

在build.gradle里面添加

compile 'com.ashokvarma.android:bottom-navigation-bar:1.4.1'//版本号可能会更新，以具体更新为准

xml中使用控件

<com.ashokvarma.bottomnavigation.BottomNavigationBar
        android:id="@+id/bottom_nav_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary">
</com.ashokvarma.bottomnavigation.BottomNavigationBar>

样式配置

/*1.首先进行fvb*/
bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_nav_bar);
/*2.进行必要的设置*/
bottomNavigationBar.setBarBackgroundColor(R.color.colorPrimary);
bottomNavigationBar.setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_RIPPLE);
bottomNavigationBar.setMode(BottomNavigationBar.MODE_SHIFTING);//适应大小
/*3.添加Tab*/
bottomNavigationBar.addItem(new BottomNavigationItem(
        R.drawable.listen_fill,R.string.bottom_nav_home)
        .setInactiveIconResource(R.drawable.listen)
        .setActiveColorResource(R.color.colorPrimary))
        .addItem(new BottomNavigationItem(
                R.drawable.speech_fill,R.string.bottom_nav_like)
                .setInactiveIconResource(R.drawable.speech)
                .setActiveColorResource(R.color.colorPrimaryDark))
                .addItem(new BottomNavigationItem(
                 R.drawable.social_fill,R.string.bottom_nav_location)
                .setInactiveIconResource(R.drawable.social)
                .setActiveColorResource(R.color.yellow))
                .addItem(new BottomNavigationItem(
                 R.drawable.profile_fill,R.string.bottom_nav_person)
                .setInactiveIconResource(R.drawable.profile)
                .setActiveColorResource(R.color.colorAccent))
                .setFirstSelectedPosition(0)//默认显示面板
                .initialise();//初始化

PS:当Background为BACKGROUND_STYLE_RIPPLE的时候，背景颜色设置会无效，这时背景颜色会体现在setActiveColor()的设置上面*
监听器配置
实现BottomNavigationBar.OnTabSelectedListener接口
重载方法

    /*Tab被选中（position为当前被选中的Tab）*/
   @Override
    public void onTabSelected(int position) {

    }
    /*Tab被取消选中（position为当前被选中的Tab）*/
    @Override
    public void onTabUnselected(int position) {

    }
    /*Tab被重新选中（position为当前被选中的Tab）*/
    @Override
    public void onTabReselected(int position) {

    }

重载方法里实现需要的逻辑（一般就是开启transaction进行fragment的切换）

三. 源码

xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="cn.foxnickel.bottomnavdemo.MainActivity">
    <include layout="@layout/content_main"/>
    <com.ashokvarma.bottomnavigation.BottomNavigationBar
        android:id="@+id/bottom_nav_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@color/colorPrimary">
    </com.ashokvarma.bottomnavigation.BottomNavigationBar>
</RelativeLayout>

MainActivity

package cn.foxnickel.bottomnavdemo;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import com.ashokvarma.bottomnavigation.BottomNavigationBar;
import com.ashokvarma.bottomnavigation.BottomNavigationItem;
import cn.foxnickel.bottomnavdemo.fragment.ListenFragmet;
import cn.foxnickel.bottomnavdemo.fragment.ProfileFragmet;
import cn.foxnickel.bottomnavdemo.fragment.SocialFragmet;
import cn.foxnickel.bottomnavdemo.fragment.SpeechFragmet;
public class MainActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener{
    private BottomNavigationBar bottomNavigationBar;
    private ListenFragmet listenFragmet;
    private SpeechFragmet speechFragmet;
    private SocialFragmet socialFragmet;
    private ProfileFragmet profileFragmet;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initBottomNavBar();
        initTab();
        bottomNavigationBar.setTabSelectedListener(this);
    }

    private void initBottomNavBar(){
        /*1.首先进行fvb*/
        bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_nav_bar);
        /*2.进行必要的设置*/
        bottomNavigationBar.setBarBackgroundColor(R.color.colorPrimary);
        bottomNavigationBar.setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_RIPPLE);
        bottomNavigationBar.setMode(BottomNavigationBar.MODE_SHIFTING);//适应大小
        /*3.添加Tab*/
        bottomNavigationBar.addItem(new BottomNavigationItem(
                R.drawable.listen_fill,R.string.bottom_nav_home)
                .setInactiveIconResource(R.drawable.listen)
                .setActiveColorResource(R.color.colorPrimary))
                .addItem(new BottomNavigationItem(
                        R.drawable.speech_fill,R.string.bottom_nav_like)
                        .setInactiveIconResource(R.drawable.speech)
                        .setActiveColorResource(R.color.colorPrimaryDark))
                .addItem(new BottomNavigationItem(
                        R.drawable.social_fill,R.string.bottom_nav_location)
                        .setInactiveIconResource(R.drawable.social)
                        .setActiveColorResource(R.color.yellow))
                .addItem(new BottomNavigationItem(
                        R.drawable.profile_fill,R.string.bottom_nav_person)
                        .setInactiveIconResource(R.drawable.profile)
                        .setActiveColorResource(R.color.colorAccent))
                .setFirstSelectedPosition(0)//默认显示面板
                .initialise();//初始化
    }

    private void initTab(){
        listenFragmet = new ListenFragmet();
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.content_main,listenFragmet);
        transaction.commit();
    }

    @Override
    public void onTabSelected(int position) {
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        switch (position){
            case 0:
                if(listenFragmet == null){
                    listenFragmet = new ListenFragmet();
                }
                transaction.replace(R.id.content_main,listenFragmet);
                break;
            case 1:
                if(speechFragmet == null){
                    speechFragmet = new SpeechFragmet();
                }                transaction.replace(R.id.content_main,speechFragmet);
                break;
            case 2:
                if(socialFragmet == null){
                    socialFragmet = new SocialFragmet();
                }
                transaction.replace(R.id.content_main,socialFragmet);
                break;
            case 3:
                if(profileFragmet == null){
                    profileFragmet = new ProfileFragmet();
                }
                transaction.replace(R.id.content_main,profileFragmet);
                break;
        }
        transaction.commit();
    }

    @Override
    public void onTabUnselected(int position) {

    }

    @Override
    public void onTabReselected(int position) {

    }
}