Android BottomNavigationBar底部导航控制器的使用（包含默认postion的设置）

转载请标明出处:http://blog.csdn.net/u010046908/article/details/50962081本文出自:【李东的博客】

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

<?xml version="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。

代码下载地址

效果实现：

---------------------
作者：请叫我小东子
来源：CSDN
原文：https://blog.csdn.net/u010046908/article/details/50962081
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