• 开始使用

compile 'com.android.support:design:25.3.1'

• 常用属性

android:background : 控件背景 
app:itemBackground : 子菜单背景 
app:itemIconTint : 图标颜色 
app:itemTextColor : 文本颜色 
app:menu : 菜单

• 图标颜色选择器

app:itemIconTint="@color/seletor_bottom_navi"

• 图标图片选择器

menu中icon 用一个图片seletor

• app:itemBackground

会替换掉原有点击水波纹效果

• app:menu

app:menu="@menu/menu_bottom_navigation_view"

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/item_1"
        android:icon="@mipmap/ic_launcher"
        android:title="消息" />

    <item
        android:id="@+id/item_2"
        android:icon="@mipmap/ic_launcher_round"
        android:title="联系人"
        />

    <item
        android:id="@+id/item_3"
        android:icon="@mipmap/ic_launcher"
        android:title="动态" />

    <item
        android:id="@+id/item_4"
        android:icon="@mipmap/ic_launcher_round"
        android:title="我的" />
</menu>

心得体会

• 常规配置

private void initBnve() {
        idBnvs.enableMenuViewShiftMode(false);//取消菜单view的展开收缩模式
        idBnvs.enableItemViewShiftingMode(false);//取消菜单view的Item  展开收缩模式 （文字 显示隐藏）
       /*   idBnvs.setItemIconTintList(null);//不是使用主题中的颜色，恢复图标本身颜色*/
      idBnvs.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@android.support.annotation.NonNull MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.id_menu_item_1:
                        break;
                    case R.id.id_menu_item_2:
                        break;
                    case R.id.id_menu_item_3:
                        break;
                    case R.id.id_menu_item_4:
                        break;
                }
              //  return false;
                return true;//返回 true 使点击有效
            }
        });
        idBnvs.setChecked(1);//选择
        idBnvs.setChecked(2);
       /* idBnvs.setClickedItem(R.id.id_menu_item_2);//选择
        idBnvs.setClickedItem(R.id.id_menu_item_3);*/
    }

• BottomNavigationViewSupport.java

public class BottomNavigationViewSupport extends BottomNavigationView {

    private BottomNavigationMenuView mMenuView;
    private BottomNavigationItemView[] mButtons;

    public BottomNavigationViewSupport(Context context) {
        this(context, null);
    }

    public BottomNavigationViewSupport(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public BottomNavigationViewSupport(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        //
        this.enableMenuViewShiftMode(false);
        this.enableItemViewShiftingMode(false);
    }

    /**
     * 根据索引选中对应Item
     * 推荐
     *
     * @param index
     */
    public void setChecked(int index) {
        if (index >= 0) {
            getMenu().getItem(index).setChecked(true);
        }
    }

    /**
     * 根据menu item id选中对应Item
     * 和 setChecked 功能一致
     *
     * @param menu_item_id
     */
    public void setClickedItem(int menu_item_id) {
        View view = findViewById(menu_item_id);
        if (view != null) {
            view.performClick();
        }
    }

    public void enableMenuViewShiftMode(boolean enable) {
        if (mMenuView == null) {
            mMenuView = ReflectTool.getFieldValueFromSuperClass(BottomNavigationView.class, this, "mMenuView");
        }
        ReflectTool.setFieldValue(mMenuView, "mShiftingMode", enable);
        // mMenuView.updateMenuView();
    }

    public void enableItemViewShiftingMode(boolean enable) {
        if (mMenuView == null) {
            mMenuView = ReflectTool.getFieldValueFromSuperClass(BottomNavigationView.class, this, "mMenuView");
        }
        if (mMenuView == null) {
            return;
        }
        if (mButtons == null) {
            mButtons = ReflectTool.getFieldValue(mMenuView, "mButtons");
        }
        for (BottomNavigationItemView button : mButtons) {
            ReflectTool.setFieldValue(button, "mShiftingMode", enable);
        }
        mMenuView.updateMenuView();
    }
}

• ReflectTool.java

/**
     * 反射获得对象的值
     *
     * @param
     * @param fieldName
     * @return
     */
    public static <T, E> T getFieldValue(E eObj, String fieldName) {
        try {
            Field field = eObj.getClass().getDeclaredField(fieldName);
            field.setAccessible(true);
            return (T) field.get(eObj);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static <E> void setFieldValue(E eObj, String fieldName, Object value) {
        try {
            Field field = eObj.getClass().getDeclaredField(fieldName);
            field.setAccessible(true);
            field.set(eObj, value);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
    }
    /**
     * 反射获得对象的值
     * 常用于  子类继承父类调用
     * @param
     * @param fieldName
     * @return
     */
    public static <T> T getFieldValueFromSuperClass(Class tClass, Object obj, String fieldName) {
        try {
            Field field = tClass.getDeclaredField(fieldName);
            field.setAccessible(true);
            return (T) field.get(obj);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void setFieldValueForSuperClass(Class tClass, Object obj, String fieldName, Object value) {
        try {
            Field field = tClass.getDeclaredField(fieldName);
            field.setAccessible(true);
            field.set(obj, value);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
    

• 参考文档

• Android BottomNavigationView，底部导航栏的简单实现 http://www.tuicool.com/articles/jyEBFfB

• BottomNavigationView从入门到强行改造,取消位移动画？和ViewPager绑定？添加Badge？ http://blog.csdn.net/qq_35064774/article/details/54177702