底部導航欄使用

implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.46'

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //去掉狀態(tài)欄
        if (Build.VERSION.SDK_INT >= 21) {
            View decorView = getWindow().getDecorView();
            decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
        }
        setContentView(R.layout.activity_follow);
        mBottomNavigationBar = findViewById(R.id.bottom_navigation_bar);
        InitNavigationBar();
    }

    private void InitNavigationBar() {
        mBottomNavigationBar.setTabSelectedListener(this);
        mBottomNavigationBar.setMode(BottomNavigationBar.MODE_FIXED);
        mBottomNavigationBar.setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_DEFAULT);        mBottomNavigationBar.setTextDirection(BottomNavigationBar.TEXT_DIRECTION_INHERIT);
        mBottomNavigationBar
                .addItem(new BottomNavigationItem(R.mipmap.bottom_tuijian_active_72, "推薦").setInactiveIconResource(R.mipmap.bottom_tuijian_72).setActiveColor(R.color.black))
                .addItem(new BottomNavigationItem(R.mipmap.bottom_yule_active_72, "娛樂").setInactiveIconResource(R.mipmap.bottom_yule_72).setActiveColor(R.color.black))
                .addItem(new BottomNavigationItem(R.mipmap.bottom_guanzhu_active_72, "關注").setInactiveIconResource(R.mipmap.bottom_guanzhu_72).setActiveColor(R.color.black))
                .addItem(new BottomNavigationItem(R.mipmap.bottom_yuba_active_72, "魚吧").setInactiveIconResource(R.mipmap.bottom_yuba_72).setActiveColor(R.color.black))
                .addItem(new BottomNavigationItem(R.mipmap.bottom_faxian_active_72, "發(fā)現(xiàn)").setInactiveIconResource(R.mipmap.bottom_faxian_72).setActiveColor(R.color.black))
                .setFirstSelectedPosition(0)
                .initialise();

        fm = getSupportFragmentManager();
        transaction = fm.beginTransaction();

        if (mRecommendFragment == null) {
            mRecommendFragment = RecommendFragment.newInstance();
        }
        fragmentList = new ArrayList<>();
        fragmentList.add(mRecommendFragment);
        fragmentList.add(EntertainmentFragment.newInstance());
        fragmentList.add(FollowFragment.newInstance());
        fragmentList.add(FishbarFragment.newInstance());
        fragmentList.add(DiscoverFragment.newInstance());

        transaction.replace(R.id.frameLayout,mRecommendFragment);
        transaction.commit();
    }

• .addItem(new BottomNavigationItem(R.mipmap.bottom_faxian_active_72, "發(fā)現(xiàn)").setInactiveIconResource(R.mipmap.bottom_faxian_72).setActiveColor(R.color.black));
  是添加一個控件，active表示選中狀態(tài)時候的圖片桥狡，inActive是未選中狀態(tài)苍姜，activeColor是選中狀態(tài)的title字體的顏色。
• 詳細使用可以參考:
  http://www.reibang.com/p/feab12806ba2
  http://www.reibang.com/p/9be7ac6d8486
  http://www.reibang.com/p/c9c7747768d0

頂部：

TabLayout + ViewPager + Fragment

• 通過FragmentPagerAdapter來綁定數據到視圖
• android.support.design.widget.CoordinatorLayout 繼承自FrameLayout，所以布局都會重疊叠洗。

<android.support.v4.view.ViewPager
        android:id="@+id/follow_viewPager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">
        <FrameLayout
            android:id="@+id/follow_live_frameLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </FrameLayout>
    </android.support.v4.view.ViewPager>

• app:layout_behavior 指定控件隨appbar滑動行為:appbar_scrolling_view_behavior是隨著appbar一起滑動愧膀，當appbar到頂端不在滑動時，該控件中的內容繼續(xù)滑動屈梁。 而不加這個行為：appbarlayout和viewPager重疊嗤练，只有appbar到達頂端，控件中的內容
  才會向上移動在讶。
• app:layout_scrollFlags="scroll|enterAlways" 是指定導航欄滑動方式煞抬。
• 詳細使用可以參考：
  http://www.reibang.com/p/c8ea998a982a

去除AppBarLayout下面的陰影

AppBarLayout有陰影.png