Android 底部导航栏BottomNavigationView的使用

迈不过友情╰ 2022-03-18 01:11 915阅读 0赞

1.BottomNavigationView是support desigin包下的控件，用于底部导航~

①使用之前在App的build.gradle中添加依赖

com.android.support:design:27.1.1

②接下来布局文件

<?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"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
    
        <FrameLayout
            android:id="@+id/framelayout"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"></FrameLayout>
    
        <android.support.design.widget.BottomNavigationView
            android:id="@+id/bottom_nav_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:background="@color/bottom_nav_bg"
            app:itemIconTint="@drawable/bottom_nav_item_selector"
            app:itemTextColor="@drawable/bottom_nav_item_selector"
            app:menu="@menu/bottom_nav_menu"></android.support.design.widget.BottomNavigationView>
    </LinearLayout>

布局包含内容区域和导航栏，内容区域framelayout是用来承载不同的fragment

<color name="bottom\_nav\_bg">\#FFFFFF</color>  
bottom\_nav\_item\_selector:

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

bottom\_nav\_menu:

<?xml version="1.0" encoding="utf-8"?>
    <menu xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto">
        <item
            android:id="@+id/tab_home_page"
            android:icon="@mipmap/icon_home_pager_not_selected"
            android:title="@string/tv_tab_home"
            android:enabled="true"
            app:showAsAction="ifRoom"></item>
        <item
            android:id="@+id/tab_knowledge_hierarchy"
            android:icon="@mipmap/icon_knowledge_hierarchy_not_selected"
            android:title="@string/tv_knowledge_hierarchy"
            android:enabled="true"
            app:showAsAction="ifRoom"></item>
        <item
            android:id="@+id/tab_navigation"
            android:icon="@mipmap/icon_navigation_not_selected"
            android:title="@string/tv_navigation"
            android:enabled="true"
            app:showAsAction="ifRoom"></item>
        <item
            android:id="@+id/tab_project"
            android:icon="@mipmap/icon_project_not_selected"
            android:title="@string/tv_project"
            android:enabled="true"
            app:showAsAction="ifRoom"></item>
    </menu>

监听BottomNavigationView状态发生变化时，fragment的切换

public class MainActivity extends AppCompatActivity {
    
       
        @BindView(R.id.framelayout)
        FrameLayout framelayout;
        @BindView(R.id.bottom_nav_view)
        BottomNavigationView bottomNavView;
       
    
        private List<Fragment> mFragments;
        HomePageFragment homePageFragment;
        KnowledgeFragment knowledgeFragment;
        NavigationFragment navigationFragment;
        ProjectFragment projectFragment;
        FragmentManager mSupportFragmentManager;
        UserDialogFragment userDialogFragment;
        SearchFragment searchFragment;
        FragmentTransaction mTransaction;
        private int mLastIndex; //记录点击上一个fragment的索引值
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            ButterKnife.bind(this);
            initToobar();
            initDrawerLayout();
            initBottomNavigationView();
            initFragment();
        }
    
        private void initFragment() {
            mFragments = new ArrayList<>();
            homePageFragment = HomePageFragment.newInstance(null, null);
            knowledgeFragment = KnowledgeFragment.newInstance(null, null);
            navigationFragment = NavigationFragment.newInstance(null, null);
            projectFragment = ProjectFragment.newInstance(null, null);
            userDialogFragment = UserDialogFragment.newInstance(null, null);
            searchFragment=SearchFragment.newInstance(null,null);
    
            mFragments.add(homePageFragment);
            mFragments.add(knowledgeFragment);
            mFragments.add(navigationFragment);
            mFragments.add(projectFragment);
            mFragments.add(userDialogFragment);
            mFragments.add(searchFragment);
            //初始化展示HomePageFragment
            setFragmentPosition(0,getString(R.string.tv_tab_home));
        }
    
    
        private void initBottomNavigationView() {
            BottomNavigationViewHelper.disableShiftMode(bottomNavView);//解决当item大于三个时，非平均布局问题
            bottomNavView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                    switch (item.getItemId()) {
                        case R.id.tab_home_page: //首页
                            setFragmentPosition(0,getString(R.string.tv_tab_home));
                            break;
                        case R.id.tab_knowledge_hierarchy: //知识体系
                            setFragmentPosition(1,getString(R.string.tv_knowledge_hierarchy));
                            break;
                        case R.id.tab_navigation: //导航
                            setFragmentPosition(2,getString(R.string.tv_navigation));
                            break;
                        case R.id.tab_project://项目
                            setFragmentPosition(3,getString(R.string.tv_project));
                            break;
                    }
                    return true;
                }
            });
        }
    
        public void setFragmentPosition(int position,String toobarTitle) {
            title.setText(toobarTitle);
            mSupportFragmentManager = this.getSupportFragmentManager();
            mTransaction = mSupportFragmentManager.beginTransaction();
            Fragment currentFragment = mFragments.get(position);
            Fragment lastFragement = mFragments.get(mLastIndex);
            mLastIndex = position;
            mTransaction.hide(lastFragement);
            if (!currentFragment.isAdded()) {
                //mTransaction.remove(currentFragment).commit();
                mTransaction.add(R.id.framelayout, currentFragment);
            }
            mTransaction.show(currentFragment);
            mTransaction.commitAllowingStateLoss();
        }
    
    }

使用到的工具类：

/**
     * Created by ${wcystart}
     * date:on 2019/1/29
     * description:解决当导航栏按钮个数大于三个时，分布非平均布局问题
     */
    
    public class BottomNavigationViewHelper {
        @SuppressLint("RestrictedApi")
        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);
            }
        }
    }

效果图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3OTgyODIz_size_16_color_FFFFFF_t_70][]   ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3OTgyODIz_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3OTgyODIz_size_16_color_FFFFFF_t_70 2][]     ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3OTgyODIz_size_16_color_FFFFFF_t_70 3][]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3OTgyODIz_size_16_color_FFFFFF_t_70 1]: /images/20220318/77d9b11fa8cb4d91b5ae653aea600677.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3OTgyODIz_size_16_color_FFFFFF_t_70 3]: /images/20220318/01442b21e1fb4d1a80ffa86be1cd2544.png