为什么我无法在Android的TabLayout上更改或滑动选项卡？
我想制作一个如上图的屏幕。因此，如果我在TabLayout中选择一个标签，则它将在向服务器发出请求之前更改一些变量，最终服务器中的数据将填充回收站视图。
我在TabLayout上使用addOnTabSelectedListener来检索更改（如果用户更改了选项卡）。通常在某些教程中，他们总是使用带有一些片段更改的选项卡布局，因此似乎他们使用viewPager来处理它。但是在这种情况下，我将其删除，而我仅使用addOnTabSelectedListener进行更改，并且因为我只需要一个回收者视图而不是多个片段
这是我在片段中使用的代码
class SearchResultFragment : Fragment() {
lateinit var fragmentView : View
lateinit var recyclerView : RecyclerView
lateinit var tabLayout : TabLayout
lateinit var mContext : Context
lateinit var mActivity : FragmentActivity
private var selectedEventType = EventType.kajianUmum
private var selectedCity = City.defaultCityName
private var selectedTime = "Akhir Pekan"
lateinit var eventAdapter : GeneralEventRecyclerViewAdapter
private var eventList = ArrayList<Event>()
override fun onAttach(context: Context) {
super.onAttach(context)
mContext = context
activity?.let { mActivity = it }
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
fragmentView = inflater.inflate(R.layout.fragment_search_result, container, false)
setUpSafeArg()
setUpViewsDeclaration()
setUpListeners()
initRecyclerView()
return fragmentView
}
private fun setUpViewsDeclaration() {
recyclerView = fragmentView.findViewById(R.id.recyclerView_event_general_search_result)
tabLayout = fragmentView.findViewById(R.id.tabLayout_time_search_result)
}
private fun setUpSafeArg() {
arguments?.let {
val args = SearchResultFragmentArgs.fromBundle(it)
selectedEventType = args.selectedEventType
selectedCity = args.selectedCity
selectedTime = args.selectedTime
}
}
private fun setUpListeners() {
tabLayout.addOnTabSelectedListener(object: TabLayout.OnTabSelectedListener {
override fun onTabSelected(tab: TabLayout.Tab?) {
when(tab?.position ?: 0) {
0 -> mActivity.toast("0")
1 -> mActivity.toast("1")
2 -> mActivity.toast("2")
3 -> mActivity.toast("3")
4 -> mActivity.toast("0")
else -> println("Number too high")
}
}
override fun onTabReselected(tab: TabLayout.Tab?) {
}
override fun onTabUnselected(tab: TabLayout.Tab?) {
}
})
}
private fun initRecyclerView() {
eventAdapter = GeneralEventRecyclerViewAdapter(mContext)
val layoutManager = LinearLayoutManager(mContext, RecyclerView.VERTICAL,false)
recyclerView.adapter = eventAdapter
recyclerView.layoutManager = layoutManager
eventAdapter.setOnItemClickListener(object: OnEventKMListener {
override fun eventKMClicked(position: Int) {
val selectedEvent = eventList[position]
val eventDetailDestination = SearchResultFragmentDirections.actionGlobalDestinationEventDetail(selectedEvent)
Navigation.findNavController(fragmentView).navigate(eventDetailDestination)
}
})
}
}
但是我不知道为什么我在运行应用程序时无法更改选项卡，也无法滑动该选项卡。该选项卡停留在索引0
这是我的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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Fragments.Search.SearchResultFragment" android:id="@+id/constraintLayout_search_result">
<com.google.android.material.tabs.TabLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="16dp"
app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="16dp" android:layout_marginTop="16dp"
app:layout_constraintTop_toTopOf="parent" android:id="@+id/tabLayout_time_search_result">
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hari Ini"/>
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Besok"/>
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Akhir Pekan"/>
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Pekan Depan"/>
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Semua"/>
</com.google.android.material.tabs.TabLayout>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="379dp"
android:layout_height="635dp"
app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="16dp"
app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="16dp"
app:layout_constraintBottom_toBottomOf="parent" android:layout_marginTop="16dp"
app:layout_constraintTop_toBottomOf="@+id/tabLayout_time_search_result"
android:id="@+id/recyclerView_event_general_search_result"
tools:listitem="@layout/item_general_event"/>
</androidx.constraintlayout.widget.ConstraintLayout>
这是我的MainActivity：
class MainActivity : AppCompatActivity(), NavController.OnDestinationChangedListener {
private lateinit var navController : NavController
lateinit var destinationTitleTextView : TextView
lateinit var progressBar : ProgressBar
lateinit var topToolbar : Toolbar
lateinit var bottomNavigationView : BottomNavigationView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
FirebaseApp.initializeApp(this)
// Initial Setup views
navController = Navigation.findNavController(this,R.id.nav_host_fragment)
setupBottomNavMenu(navController)
setupActionBar(navController)
setUpViewDeclaration()
// Add Listeners
navController.addOnDestinationChangedListener(this)
}
override fun dispatchTouchEvent(event: MotionEvent): Boolean {
// to hide softkeyboard when tapping outside area in the fragment
// And in the layout of the fragment use this attribute: android:focusableInTouchMode="true"
if (event.action == MotionEvent.ACTION_DOWN) {
val v = currentFocus
if (v is EditText) {
val outRect = Rect()
v.getGlobalVisibleRect(outRect)
if (!outRect.contains(event.rawX.toInt(), event.rawY.toInt())) {
v.clearFocus()
val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
imm.hideSoftInputFromWindow(v.windowToken, 0)
}
}
}
return super.dispatchTouchEvent(event)
}
private fun setUpViewDeclaration() {
destinationTitleTextView = findViewById(R.id.destination_label_text_view)
progressBar = findViewById(R.id.progressBar_main_activity)
topToolbar = findViewById(R.id.top_toolbar)
bottomNavigationView = findViewById(R.id.bottom_nav)
}
private fun setupBottomNavMenu(navController: NavController) {
bottom_nav.setupWithNavController(navController)
}
private fun setupActionBar(navController: NavController) {
setSupportActionBar(top_toolbar)
supportActionBar?.setDisplayShowTitleEnabled(false)
// set up top hierarchy destination
val appBarConfiguration = AppBarConfiguration(setOf(
R.id.destination_home,
R.id.destination_search,
R.id.destination_user_control,
R.id.destination_create_event)
)
top_toolbar.setupWithNavController(navController,appBarConfiguration)
}
override fun onDestinationChanged(controller: NavController, destination: NavDestination, arguments: Bundle?) {
progressBar.visibility = View.GONE // to ensure progress bar will be gone whenever the user segues to other destination
// set toolbar and bottom navigation visibility
if (destination.id == R.id.destination_welcome ||
destination.id == R.id.destination_authentication ||
destination.id == R.id.destination_loginUsingEmail ||
destination.id == R.id.destination_registerUsingEmail ||
destination.id == R.id.destination_choose_user_location ||
destination.id == R.id.destination_change_password ||
destination.id == R.id.destination_create_event_finished_info ||
destination.id == R.id.destination_photo_view
) {
topToolbar.visibility = View.GONE
bottomNavigationView.visibility = View.GONE
} else if (
destination.id == R.id.destination_create_event_name ||
destination.id == R.id.destination_create_event_type ||
destination.id == R.id.destination_create_event_starting_date ||
destination.id == R.id.destination_create_event_ending_date ||
destination.id == R.id.destination_create_event_speaker ||
destination.id == R.id.destination_create_event_description ||
destination.id == R.id.destination_create_event_poster ||
destination.id == R.id.destination_create_event_coordinate ||
destination.id == R.id.destination_create_event_location_detail ||
destination.id == R.id.destination_create_event_contact ||
destination.id == R.id.destination_create_event_price ||
destination.id == R.id.destination_create_event_capacity ||
destination.id == R.id.destination_create_event_summary ||
destination.id == R.id.destination_create_event_finished_info ||
destination.id == R.id.destination_event_detail ||
destination.id == R.id.destination_event_description_detail ||
destination.id == R.id.destination_map_detail_location
) {
topToolbar.visibility = View.VISIBLE
bottomNavigationView.visibility = View.GONE
} else if (
destination.id == R.id.destination_user_control ||
destination.id == R.id.destination_search
) {
topToolbar.visibility = View.GONE
bottomNavigationView.visibility = View.VISIBLE
} else {
topToolbar.visibility = View.VISIBLE
bottomNavigationView.visibility = View.VISIBLE
}
// Set Toolbar Title
if (destination.id == R.id.destination_home) {
destinationTitleTextView.setText(R.string.home)
} else if (destination.id == R.id.destination_create_event_summary) {
destinationTitleTextView.text = "Ringkasan"
} else if (
destination.id == R.id.destination_create_event ||
destination.id == R.id.destination_create_event_name ||
destination.id == R.id.destination_create_event_type ||
destination.id == R.id.destination_create_event_starting_date ||
destination.id == R.id.destination_create_event_ending_date ||
destination.id == R.id.destination_create_event_speaker ||
destination.id == R.id.destination_create_event_description ||
destination.id == R.id.destination_create_event_poster ||
destination.id == R.id.destination_create_event_coordinate ||
destination.id == R.id.destination_create_event_location_detail ||
destination.id == R.id.destination_create_event_contact ||
destination.id == R.id.destination_create_event_capacity ||
destination.id == R.id.destination_create_event_price ||
destination.id == R.id.destination_create_event_summary ||
destination.id == R.id.destination_create_event_finished_info
) {
destinationTitleTextView.setText(R.string.createEvent)
} else {
destinationTitleTextView.text = ""
}
}
}
这里出了什么问题？ java没问题
1 个答案:
答案 0 :(得分：2)
您可以使用TabHost制作此东西，尽管这是一种旧方法。另一种方法是将viewpager包装在布局中。这是一些很好的教程。
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