最近Google在自己推出的Material design中增加了Bottom Navigation导航控制。Android一直没有官方的导航控制器，自己实现确实是五花八门，有了这个规定之后，就类似苹果的底部Toolbar，以后我们的APP就会有一致的风格，先看一张效果：

这是官方在Material design中给出一张图，确实很不错。

1.BottomNavigationBar的下载地址

https://github.com/Ashok-Varma/BottomNavigation

2.使用的方法

2.1在Gradle中添加

compile ‘com.ashokvarma.android:bottom-navigation-bar:0.9.5'

2.2布局实现

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

2.3类中Activity中添加BottomNavigationItem

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();

2.4设置事件监听器TabChangeListener

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

3.案例的实现

布局文件

<"1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:showIn="@layout/activity_navigation_view_demo" tools:context="com.lidong.demo.navigation_view.BottomNavigationBarDemoActivity"> <LinearLayout android:id="@+id/tb" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" /> <com.ashokvarma.bottomnavigation.BottomNavigationBar android:id="@+id/bottom_navigation_bar" android:layout_width="match_parent" android:layout_alignParentBottom="true" android:layout_height="wrap_content"/> </RelativeLayout>

Activity的代码：

package com.lidong.demo.navigation_view; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.util.Log; import com.ashokvarma.bottomnavigation.BottomNavigationBar; import com.ashokvarma.bottomnavigation.BottomNavigationItem; import com.lidong.demo.R; /** * BottomNavigationBar实现 */ public class BottomNavigationBarDemoActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener { private BottomNavigationBar bottomNavigationBar; int lastSelectedPosition = 0; private String TAG = BottomNavigationBarDemoActivity.class.getSimpleName(); private LocationFragment mLocationFragment; private FindFragment mFindFragment; private FavoritesFragment mFavoritesFragment; private BookFragment mBookFragment; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_navigation_view_demo); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar); bottomNavigationBar .addItem(new BottomNavigationItem(R.mipmap.ic_location_on_white_24dp, "位置").setActiveColor(R.color.orange)) .addItem(new BottomNavigationItem(R.mipmap.ic_find_replace_white_24dp, "发现").setActiveColor(R.color.blue)) .addItem(new BottomNavigationItem(R.mipmap.ic_favorite_white_24dp, "爱好").setActiveColor(R.color.green)) .addItem(new BottomNavigationItem(R.mipmap.ic_book_white_24dp, "图书").setActiveColor(R.color.blue)) .setFirstSelectedPosition(lastSelectedPosition ) .initialise(); bottomNavigationBar.setTabSelectedListener(this); setDefaultFragment(); } /** * 设置默认的 */ private void setDefaultFragment() { FragmentManager fm = getFragmentManager(); FragmentTransaction transaction = fm.beginTransaction(); mLocationFragment = LocationFragment.newInstance("位置"); transaction.replace(R.id.tabs, mLocationFragment); transaction.commit(); } @Override public void onTabSelected(int position) { Log.d(TAG, "onTabSelected() called with: " + "position = [" + position + "]"); FragmentManager fm = this.getFragmentManager(); //开启事务 FragmentTransaction transaction = fm.beginTransaction(); switch (position) { case 0: if (mLocationFragment == null) { mLocationFragment = LocationFragment.newInstance("位置"); } transaction.replace(R.id.tb, mLocationFragment); break; case 1: if (mFindFragment == null) { mFindFragment = FindFragment.newInstance("发现"); } transaction.replace(R.id.tb, mFindFragment); break; case 2: if (mFavoritesFragment == null) { mFavoritesFragment = FavoritesFragment.newInstance("爱好"); } transaction.replace(R.id.tb, mFavoritesFragment); break; case 3: if (mBookFragment == null) { mBookFragment = BookFragment.newInstance("图书"); } transaction.replace(R.id.tb, mBookFragment); break; default: break; } // 事务提交 transaction.commit(); } @Override public void onTabUnselected(int position) { Log.d(TAG, "onTabUnselected() called with: " + "position = [" + position + "]"); } @Override public void onTabReselected(int position) { } }

fragment的代码

package com.lidong.demo.navigation_view; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import com.lidong.demo.R; public class LocationFragment extends Fragment { public static LocationFragment newInstance(String param1) { LocationFragment fragment = new LocationFragment(); Bundle args = new Bundle(); args.putString("agrs1", param1); fragment.setArguments(args); return fragment; } public LocationFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_location, container, false); Bundle bundle = getArguments(); String agrs1 = bundle.getString("agrs1"); TextView tv = (TextView)view.findViewById(R.id.tv_location); tv.setText(agrs1); return view; } }

代码下载：https://github.com/lidong1665/AndroidRapidLibrary

代码实现起来很简单，就加载布局，添加BottomNavigationItem，设置TabChangeListener就这三步搞定底部导航控制器。

以上就是关于BottomNavigationBar底部导航控制器，希望对大家的学习有所帮助。