BottomNavigationBar底部导航栏

最近在从项目里总结一些知识点，虽然删掉了一些代码，不过里面还是有一点点代码是写其他东西的，篇幅问题一些布局跟适配器之类的就没弄上去，虽然不是一个单纯的BottomNavigationBar Demo，不过还是可以参考一下的，使用的步骤步骤阿之类的。
总的来说：挺方便的，动画效果也蛮好。大概用法就是在先添加依赖，设计完BottomNavigationBar后，在按钮响应那里加载对应的Fragment。

一、出处：

https://github.com/Ashok-Varma/BottomNavigation GitHub真是个好东西

二、使用的方法

1在Gradle中添加依赖

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

2布局实现，直接用

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

3类中Activity中添加BottomNavigationItem

BottomNavigationBar bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);
bottomNavigationBar.addItem(new BottomNavigationItem(R.drawable.ic_add_white_24dp, "创建").setActiveColorResource(R.color.orange))
        .addItem(new BottomNavigationItem(R.drawable.ic_group_add_black_24dp, "加入").setActiveColorResource(R.color.orange))
        .addItem(new BottomNavigationItem(R.drawable.courselocation, "我").setActiveColorResource(R.color.orange))
        .setFirstSelectedPosition(0)
        .initialise();

4设置事件监听器TabChangeListener

bottomNavigationBar.setTabSelectedListener(this);

实现几个默认方法：

public void onTabSelected(int position) {
//在里面写加载对应Fragment的功能
            }
            @Override
            public void onTabUnselected(int position) {]
            }
            @Override
            public void onTabReselected(int position) {
            }

三、项目里的实现

Activity：

public class MainActivity extends BaseActivity implements BottomNavigationBar.OnTabSelectedListener {
    private ArrayList<Fragment> fragments;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题拦
        setContentView(R.layout.activity_main);
        BottomNavigationBar bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);
        bottomNavigationBar.setMode(BottomNavigationBar.MODE_SHIFTING);
        bottomNavigationBar
                .setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_STATIC
                );
        BadgeItem numberBadgeItem = new BadgeItem()
                .setBorderWidth(4)
                .setBackgroundColor(Color.RED)
                .setText("5")
                .setHideOnSelect(true);
        bottomNavigationBar.addItem(new BottomNavigationItem(R.drawable.ic_add_white_24dp, "创建").setActiveColorResource(R.color.orange))
                .addItem(new BottomNavigationItem(R.drawable.ic_group_add_black_24dp, "加入").setActiveColorResource(R.color.orange))
                .addItem(new BottomNavigationItem(R.drawable.courselocation, "我").setActiveColorResource(R.color.orange))
                .setFirstSelectedPosition(0)
                .initialise();
        fragments = getFragments();
        setDefaultFragment();
        bottomNavigationBar.setTabSelectedListener(this);
    }
    /**
     * 设置默认的
     */
    private void setDefaultFragment() {
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction transaction = fm.beginTransaction();
        transaction.replace(R.id.layFrame, AddFragment.newInstance("Home"));
        transaction.commit();
    }
    //将Fragment加入fragments里面
    private ArrayList<Fragment> getFragments() {
        ArrayList<Fragment> fragments = new ArrayList<>();
        fragments.add(AddFragment.newInstance("添加课程"));
        fragments.add(JoinFragment.newInstance("加入课程"));
        fragments.add(AccountFragment.newInstance("我",this));
        return fragments;
    }
    //点击时加载对应的fragment
    @Override
    public void onTabSelected(int position) {
        if (fragments != null) {
            if (position < fragments.size()) {
                FragmentManager fm = getSupportFragmentManager();
                FragmentTransaction ft = fm.beginTransaction();
                Fragment fragment = fragments.get(position);
                ft.replace(R.id.layFrame,fragment);
                ft.commitAllowingStateLoss();
            }
        }
    }
    @Override
    public void onTabUnselected(int position) {
        if (fragments != null) {
            if (position < fragments.size()) {
                FragmentManager fm = getSupportFragmentManager();
                FragmentTransaction ft = fm.beginTransaction();
                Fragment fragment = fragments.get(position);
                ft.remove(fragment);
                ft.commitAllowingStateLoss();
            }
        }
    }
    @Override
    public void onTabReselected(int position) {
    }
}

Fragment的构造：（以AccountFragment为例，其他的类似）

public class AccountFragment extends Fragment{
    private List<StringAndInt> list;
    private ListView item_list;
    private static Context mcontext;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.account_fragment, container, false);
        item_list= (ListView) view.findViewById(R.id.item_list);
        initList();
        return view;
    }
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }
    public static AccountFragment newInstance(String content,Context context) {
        Bundle args = new Bundle();
        args.putString("ARGS", content);
        AccountFragment fragment = new AccountFragment();
        fragment.setArguments(args);
        mcontext=context;
        return fragment;
    }
    private void initList(){
        list=new ArrayList<StringAndInt>();
        list.add(new StringAndInt("个人信息",R.drawable.person,true));
        list.add(new StringAndInt("商务合作",R.drawable.business,false));
        list.add(new StringAndInt("我的记录",R.drawable.sign,true));
        list.add(new StringAndInt("使用帮助",R.drawable.help,false));
        list.add(new StringAndInt("用户反馈",R.drawable.feedback,false));
        list.add(new StringAndInt("关于我们",R.drawable.about_us,true));
        list.add(new StringAndInt("设置",R.drawable.setting_,true));
        ListitemAdaper itemListAdapter=new ListitemAdaper(mcontext,list);
        item_list.setAdapter(itemListAdapter);
    }
}

主活动xml布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.wangchang.testbottomnavigationbar.MainActivity">
    <FrameLayout
        android:id="@+id/layFrame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">
    </FrameLayout>
    <com.ashokvarma.bottomnavigation.BottomNavigationBar
        android:id="@+id/bottom_navigation_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom" />
</LinearLayout>

效果图：看下面那三个导航钮，就是那样效果，上面的UI不用管它