android基础控件（3）BottomNavigationView+FragmentLayout实现底层导航栏
16lz
2021-12-04
1.BottomNavigationView+FragmentLayout
1.1 activity_main
<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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" tools:context=".base.MainActivity"><FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginBottom="40dp" android:id="@+id/frag1"/><com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/bnv1" android:layout_width="match_parent" android:layout_height="40dp" android:layout_alignParentBottom="true" app:menu="@menu/bottomnavigationmenu" android:background="@color/white"/>RelativeLayout>1.2 BottomNavigationView添加menu
<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/home" android:title="主页" android:icon="@mipmap/home_normal"/> <item android:id="@+id/select" android:title="精选" android:icon="@mipmap/select_normal"/> <item android:id="@+id/red_packet" android:title="特惠" android:icon="@mipmap/red_packet_normal"/> <item android:id="@+id/search" android:title="搜索" android:icon="@mipmap/search_normal"/>menu>#####1.3 Main_Activity
public class MainActivity extends AppCompatActivity { private BottomNavigationView mBottomNavigationView; private FragmentManager mFragmentManager; private FragmentTransaction mTransaction; private HomeFragment mHomeFragment; private static Context mContext; private SelectFragment mSelectFragment; private RedFragment mRedFragment; private SearchFragment mSearchFragment; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initUI(); initListener(); mContext=getContext(); } public static Context getContext(){ return mContext; } private void initListener() { mBottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() { @Override public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) { switch (menuItem.getItemId()){ case R.id.home: switchFragment(mHomeFragment); break; case R.id.select: switchFragment(mSelectFragment); break; case R.id.red_packet: switchFragment(mRedFragment); break; case R.id.search: switchFragment(mSearchFragment); break; } return true; } }); } private Fragment lastFramgent=null; private void switchFragment(Fragment homeFragment) { mTransaction = mFragmentManager.beginTransaction(); if (!homeFragment.isAdded()) { mTransaction.add(R.id.frag1,homeFragment); }else { mTransaction.show(homeFragment); } if (lastFramgent!=null){ mTransaction.hide(lastFramgent); } lastFramgent=homeFragment;// mTransaction.replace(R.id.frag1,homeFragment); mTransaction.commit(); } private void initUI() { mBottomNavigationView = findViewById(R.id.bnv1); mFragmentManager = getSupportFragmentManager(); mHomeFragment = new HomeFragment(); mSelectFragment = new SelectFragment(); mRedFragment = new RedFragment(); mSearchFragment = new SearchFragment(); switchFragment(mHomeFragment); }}1.4为每个menu添加Fragment
每个Fragment实现对应的功能，这里省略详细的布局。
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