Android(安卓)Studio自带的底部导航栏 实现从其他Activity跳转到MainActivity下的任意一个Fragment
16lz
2021-01-26
总体思想：
可以先跳转到Fragment所在的MainActivity，再通过NavController控制跳转到指定的Fragment,就可以显示出来了
// 其他的Activity界面 (即你当前所在的Activity,你需要跳转到底部导航栏的任意一项(Fragment))Intent intent = new Intent(Details.this, MainActivity.class);// 设置需要跳转到底部导航栏项的标志(名称随意，数字也随意，对应即可)intent.putExtra("fragment_flag",1);startActivity(intent);MainActivity代码：
public class MainActivity extends AppCompatActivity { NavController navController = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); BottomNavigationView navView = findViewById(R.id.nav_view); // Passing each menu ID as a set of Ids because each // menu should be considered as top level destinations. AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder( R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications,R.id.navigation_search) .build(); navController = Navigation.findNavController(this, R.id.nav_host_fragment); NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration); NavigationUI.setupWithNavController(navView, navController); } @Override protected void onResume() { // 获取从其他Activity发送过来跳转Fragment的标志fragment_flag(名称随意) int fragmentFlag = this.getIntent().getIntExtra("fragment_flag", 0); switch (fragmentFlag){ case 1: // 控制跳转到底部导航项(navigation_home为该Fragment的对应控件的id值) navController.navigate(R.id.navigation_home); break; case 2: navController.navigate(R.id.navigation_dashboard); break; case 3: navController.navigate(R.id.navigation_search); break; case 4: navController.navigate(R.id.navigation_cart); break; case 5: navController.navigate(R.id.navigation_notifications); break; } super.onResume(); }}NavController用法参看
对应的fragment
<?xml version="1.0" encoding="utf-8"?><navigation 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:id="@+id/mobile_navigation" app:startDestination="@+id/navigation_home"> <fragment android:id="@+id/navigation_home" android:name="com.gzpy.onlineretailerstest.ui.home.HomeFragment" android:label="@string/title_home" tools:layout="@layout/fragment_home" /> <fragment android:id="@+id/navigation_dashboard" android:name="com.gzpy.onlineretailerstest.ui.dashboard.DashboardFragment" android:label="@string/title_dashboard" tools:layout="@layout/fragment_dashboard" /> <fragment android:id="@+id/navigation_search" android:name="com.gzpy.onlineretailerstest.ui.search.SearchFragment" android:label="@string/title_search" tools:layout="@layout/fragment_dashboard" /> <fragment android:id="@+id/navigation_cart" android:name="com.gzpy.onlineretailerstest.ui.cart.CartFragment" android:label="@string/title_cart" tools:layout="@layout/fragment_cart" /> <fragment android:id="@+id/navigation_notifications" android:name="com.gzpy.onlineretailerstest.ui.notifications.NotificationsFragment" android:label="@string/title_notifications" tools:layout="@layout/fragment_notifications" /></navigation>activity_main.xml
<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent"> <!-- android:paddingTop="?attr/actionBarSize" 设置此属性顶部会出现空白--> <!--app:labelVisibilityMode="labeled"可以把文字显示出来--> <com.google.android.material.bottomnavigation.BottomNavigationView app:labelVisibilityMode="labeled" android:id="@+id/nav_view" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginStart="0dp" android:layout_marginEnd="0dp" android:background="?android:attr/windowBackground" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:menu="@menu/bottom_nav_menu" /> <fragment android:id="@+id/nav_host_fragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="match_parent" android:layout_height="match_parent" app:defaultNavHost="true" app:layout_constraintBottom_toTopOf="@id/nav_view" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:navGraph="@navigation/mobile_navigation" /></androidx.constraintlayout.widget.ConstraintLayout>item:
<?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/ic_home_black_24dp" android:title="@string/title_home" /> <item android:id="@+id/navigation_dashboard" android:icon="@drawable/ic_dashboard_black_24dp" android:title="@string/title_dashboard" /> <item android:id="@+id/navigation_search" android:icon="@drawable/ic_search" android:title="@string/title_search" /> <item android:id="@+id/navigation_cart" android:icon="@drawable/ic_cart" android:title="@string/title_cart" /> <item android:id="@+id/navigation_notifications" android:icon="@drawable/ic_me" android:title="@string/title_notifications" /></menu>fragment:
public class HomeFragment extends Fragment {// private HomeViewModel homeViewModel; public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {// homeViewModel = ViewModelProviders.of(this).get(HomeViewModel.class);// View root = inflater.inflate(R.layout.fragment_home, container, false);// final TextView textView = root.findViewById(R.id.text_home);// homeViewModel.getText().observe(this, new Observer() { // @Override// public void onChanged(@Nullable String s) {// textView.setText(s);// }// }); View root = inflater.inflate(R.layout.fragment_home, container, false); listView = root.findViewById(R.id.listView); // 设置显示菜单 setHasOptionsMenu(true); return root; } @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); }}更多相关文章
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