Android(安卓)使用BottomNavigationView实现底部导航栏

今天我们来使用BottomNavigationView来实现android底部导航栏，在Android Support Library 25 中增加了 BottomNavigationView 控件，官方为我们提供了这样这一个控件，就来试试吧！

1.效果图如下：

2.导入以下support:design library，BottomNavigationView就在这个design库中。

compile'com.android.support:design:25.0.1'

3.在res下新建一个menu,然后在menu下建一个navigation.xml(在四个item中，放置了四个icon)。
navigation.xml：

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android">    <item  android:id="@+id/navigation_home" android:icon="@drawable/iv1_p" android:title="首页" />    <item  android:id="@+id/navigation_dashboard" android:icon="@drawable/iv2_p" android:title="钱包" />    <item  android:id="@+id/navigation_notifications" android:icon="@drawable/iv3_p" android:title="卡片" />    <item  android:id="@+id/navigation_person" android:icon="@drawable/iv4_p" android:title="个人" />menu>

4.在布局文件中使用BottomNavigationView：

<?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.afanbaby.bottomnavigationdemo.MainActivity">    <android.support.v4.view.ViewPager  android:id="@+id/vp" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" />    <android.support.design.widget.BottomNavigationView  android:id="@+id/bottomNavigationView" android:layout_width="match_parent" android:layout_height="50dp" android:layout_alignParentBottom="true" android:background="?android:attr/windowBackground" app:itemBackground="@null" app:itemIconTint="@drawable/bottom_navigation_selector" app:itemTextColor="@drawable/bottom_navigation_selector" app:menu="@menu/navigation" />LinearLayout>

5.在drawable中新建bottom_navigation_selector.xml（设置文字和icon选中和未选中的颜色）：

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:color="@color/tab_checked" android:state_checked="true" />    <item android:color="@color/tab_unchecked" android:state_checked="false" />selector>

6.color中增加两个颜色值：

<?xml version="1.0" encoding="utf-8"?><resources><color name="tab_checked">#ED6A2Ccolor>        <color name="tab_unchecked">#757575color>resources>

7.就可以在MainActivity中使用了：

public class MainActivity extends AppCompatActivity {    private BottomNavigationView bottomNavigationView;    private ViewPagerAdapter viewPagerAdapter;    private ViewPager viewPager;    private MenuItem menuItem;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigationView);        bottomNavigationView.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);        BottomNavigationViewHelper.disableShiftMode(bottomNavigationView);        viewPager = (ViewPager) findViewById(R.id.vp);        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {                if (menuItem != null) {                    menuItem.setChecked(false);                } else {                    bottomNavigationView.getMenu().getItem(0).setChecked(false);                }                menuItem = bottomNavigationView.getMenu().getItem(position);                menuItem.setChecked(true);            }            @Override            public void onPageScrollStateChanged(int state) {            }        });        viewPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());        viewPager.setAdapter(viewPagerAdapter);        List list = new ArrayList<>();        list.add(TestFragment.newInstance("首页"));        list.add(TestFragment.newInstance("钱包"));        list.add(TestFragment.newInstance("卡片"));        list.add(TestFragment.newInstance("个人"));        viewPagerAdapter.setList(list);    }    private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener = new BottomNavigationView.OnNavigationItemSelectedListener() {        @Override        public boolean onNavigationItemSelected(@NonNull MenuItem item) {            menuItem = item;            switch (item.getItemId()) {                case R.id.navigation_home:                    viewPager.setCurrentItem(0);                    return true;                case R.id.navigation_dashboard:                    viewPager.setCurrentItem(1);                    return true;                case R.id.navigation_notifications:                    viewPager.setCurrentItem(2);                    return true;                case R.id.navigation_person:                    viewPager.setCurrentItem(3);                    return true;            }            return false;        }    };}

8.ViewPagerAdapter：

public class ViewPagerAdapter extends FragmentPagerAdapter {    private List list;    public void setList(List list) {        this.list = list;        notifyDataSetChanged();    }    public ViewPagerAdapter(FragmentManager fm) {        super(fm);    }    @Override    public Fragment getItem(int position) {        return list.get(position);    }    @Override    public int getCount() {        return list != null ? list.size() : 0;    }}

9.测试的TestFragment：

public class TestFragment extends Fragment {    private TextView tv;    public static TestFragment newInstance(String name) {        Bundle args = new Bundle();        args.putString("name", name);        TestFragment fragment = new TestFragment();        fragment.setArguments(args);        return fragment;    }    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment_test, container, false);        return view;    }    @Override    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);        tv = (TextView) view.findViewById(R.id.fragment_test_tv);        Bundle bundle = getArguments();        if (bundle != null) {            String name = bundle.get("name").toString();             tv.setText(name);        }    }}

10.测试的TestFragment的布局文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">    <TextView  android:id="@+id/fragment_test_tv" android:layout_width="match_parent" android:layout_height="match_parent" android:textSize="28dp" android:gravity="center" android:text="ceshi"/>LinearLayout>

这样就完成了，是不是很简单，快去试下吧！

11.需要注意的地方：
(1)取消位移动画,如果你的菜单数大于3个，则界面是这样的(引用网络)。

这个效果可定不是我们想要的效果，可以通过反射解决。
新建一个BottomNavigationViewHelper.class:

public class BottomNavigationViewHelper {    public static void disableShiftMode(BottomNavigationView view) {        BottomNavigationMenuView menuView = (BottomNavigationMenuView) view.getChildAt(0);        try {            Field shiftingMode = menuView.getClass().getDeclaredField("mShiftingMode");            shiftingMode.setAccessible(true);            shiftingMode.setBoolean(menuView, false);            shiftingMode.setAccessible(false);            for (int i = 0; i < menuView.getChildCount(); i++) {                BottomNavigationItemView item = (BottomNavigationItemView) menuView.getChildAt(i);                //noinspection RestrictedApi                item.setShiftingMode(false);                // set once again checked value, so view will be updated                //noinspection RestrictedApi                item.setChecked(item.getItemData().isChecked());            }        } catch (NoSuchFieldException e) {            Log.e("BNVHelper", "Unable to get shift mode field", e);        } catch (IllegalAccessException e) {            Log.e("BNVHelper", "Unable to change value of shift mode", e);        }    }}

(2)取消导航栏的点击效果（类似水波纹的效果）

我们只需在BottomNavigationView的布局文件中添加一个属性：

app:itemBackground="@null"

(3)取消导航栏的每项点击文字和图片放大的效果

我们需要在values中的demens.xml中设置：

<?xml version="1.0" encoding="utf-8"?><resources>        <dimen name="design_bottom_navigation_active_text_size">10dpdimen>    <dimen name="design_bottom_navigation_text_size">10dpdimen>                resources>

12.demo的地址：

http://download.csdn.net/download/afanbaby/10237265

本人菜鸟一个，有什么不对的地方希望大家指出评论，大神勿喷，希望大家一起学习进步！

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