单击菜单中的按钮后如何切换到使用数据绑定的片段

Question

enter image description here

class MainActivity : AppCompatActivity() { lateinit var 绑定：ActivityMainBinding 重写乐趣 onCreate(savedInstanceState: Bundle?) { super.onCreate（已保存实例状态）绑定 = ActivityMainBinding.inflate(layoutInflater) setContentView(binding.root) }

override fun onCreateOptionsMenu(menu: Menu?): Boolean {
    menuInflater.inflate(R.menu.bottom_nav_bar_main , menu)
    return true
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    val intent : Intent
    when(item.itemId) {
        R.id.itemCourses -> {
            val fragment = CoursesFragment.newInstance()
        }
    }
    return true
}

}

class CoursesFragment : Fragment() {

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    val binding = FragmentCoursesBinding.inflate(inflater , container , false)
    return binding.root
}

}

Answer 1

第 1 步：将 FragmentContainerView 添加到您的 activity xml

<androidx.fragment.app.FragmentContainerView
     android:id="@+id/container"
     android:layout_width="match_parent"
     android:layout_height="match_parent" />

第 2 步：在您的 MainActivity.class 文件中，声明 FragmentManager

private FragmentManager manager;

第 3 步：在 onCreate() 中初始化 FragmentManager

manager = getSupportFragmentManager();

第 4 步：在您的 onOptionsItemSelected 中开始此片段

Bundle bundle = new Bundle();
manager.beginTransaction()
                .replace(R.id.container, YourFragment.class, bundle, "TAG")
                .setReorderingAllowed(true)
                //.setCustomAnimations(R.anim.anim_enter, R.anim.anim_exit)
                .addToBackStack("TAG")
                .commit();

单击菜单中的按钮后如何切换到使用数据绑定的片段

how to switch after clicking on the button in the menu to a fragment in which data binding is used

android

kotlin

android-fragments