如何将对 RtL 的支持添加到 viewPager Kotlin 中？

Question

我要添加或申请：

viewPager?.rotationY = 180F

当应用程序语言设置为 fa 或 ps 从 en 时到我的视图寻呼机。或者在语言为 en 时阻止应用它。我在整个应用程序中使用了 viewPager?.rotationY = 180F，但我希望它仅适用于 fa 和 ps 语言。并使用 android:rotationY="180" 但它适用于所有应用程序语言。

DAshboardActivity.kt里有我的相关代码如下:

@file:Suppress("NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS", "DEPRECATION")

套餐af.azdreams.myconquer

import af.azdreams.myconquer.databinding.ActivityDashboardBinding
import af.azdreams.myconquer.fragments.ExploreFragment
import af.azdreams.myconquer.fragments.FlightsFragment
import af.azdreams.myconquer.fragments.TravelFragment
import android.annotation.SuppressLint
import android.content.Context
import android.content.DialogInterface
import android.content.Intent
import android.content.res.Configuration
import android.graphics.BitmapFactory
import android.net.Uri
import android.os.Bundle
import android.preference.PreferenceManager
import android.view.View
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.ActionBarDrawerToggle
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.app.AppCompatDelegate
import androidx.appcompat.widget.Toolbar
import androidx.drawerlayout.widget.DrawerLayout
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentPagerAdapter
import androidx.viewpager.widget.ViewPager
import com.bumptech.glide.Glide
import com.google.android.material.badge.BadgeDrawable
import com.google.android.material.navigation.NavigationView
import com.google.android.material.tabs.TabLayout
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.*
import com.google.firebase.database.ktx.database
import com.google.firebase.ktx.Firebase
import com.google.firebase.storage.FirebaseStorage
import com.google.firebase.storage.StorageReference
import java.io.File
import java.util.*

class DashboardActivity : AppCompatActivity() {
private lateinit var storageReference: StorageReference
private lateinit var databaseReference: DatabaseReference
private lateinit var user: User
private lateinit var uid: String
private var toolbar: Toolbar? = null
private var viewPager: ViewPager? = null
private var tabLayout: TabLayout? = null
private var exploreFragment: ExploreFragment? = null
private var flightsFragment: FlightsFragment? = null
private var travelFragment: TravelFragment? = null
private lateinit var auth: FirebaseAuth
private lateinit var binding: ActivityDashboardBinding
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    auth = FirebaseAuth.getInstance()
    uid = auth.currentUser?.uid.toString()
    databaseReference = FirebaseDatabase.getInstance().getReference("Users")
    if (uid.isNotEmpty()){
        getUserData()
    }
    loadLocale()
    binding = ActivityDashboardBinding.inflate(layoutInflater)
    setContentView(binding.root)
    onClickListenerSearchUser()
    val scoresRef = Firebase.database.getReference("Users")
    scoresRef.keepSynced(true)
    initData()
    checkTheme()
    findViewById<Toolbar>(R.id.toolbar).also { toolbar = it }
    setSupportActionBar(toolbar)
    findViewById<ViewPager>(R.id.viewPager).also { viewPager = it }
    findViewById<TabLayout>(R.id.tabLayout).also { tabLayout = it }
    exploreFragment = ExploreFragment()
    flightsFragment = FlightsFragment()
    travelFragment = TravelFragment()
    with(tabLayout) { this?.setupWithViewPager(viewPager) }
    val viewPagerAdapter = ViewPagerAdapter(supportFragmentManager, 0)
    viewPagerAdapter.addFragment(exploreFragment!!,resources.getString(R.string.home))
    viewPagerAdapter.addFragment(flightsFragment!!,resources.getString(R.string.flights))
    viewPagerAdapter.addFragment(travelFragment!!,resources.getString(R.string.dictionary))
    with(viewPager) {
        this!!.adapter = viewPagerAdapter
    }

    val tabLayout = tabLayout
    tabLayout?.getTabAt(0)?.setIcon(R.drawable.icon_home)
    tabLayout?.getTabAt(1)?.setIcon(R.drawable.icon_flights)
    tabLayout?.getTabAt(2)?.setIcon(R.drawable.icon_dictionary)
    val badgeDrawable: BadgeDrawable = tabLayout?.getTabAt(0)!!.orCreateBadge
    badgeDrawable.isVisible = true
    badgeDrawable.number = 12
    val drawerLayout = findViewById<DrawerLayout>(af.azdreams.myconquer.R.id.drawerLayout)
    val toolbar = findViewById<Toolbar>(R.id.toolbar)
    val navView = findViewById<NavigationView>(R.id.navView)
    val toggle = ActionBarDrawerToggle(this,drawerLayout,toolbar, R.string.open, R.string.close)
    toggle.isDrawerIndicatorEnabled = true
    supportActionBar?.setDisplayShowTitleEnabled(false)
    drawerLayout.addDrawerListener(toggle)
    toggle.syncState()
    navView.setNavigationItemSelectedListener {
        when(it.itemId){
            R.id.itmFetch ->startActivity(Intent(this,UserProfileActivity::class.java))
            R.id.itmProfile ->startActivity(Intent(this,Profile::class.java))
            R.id.itmLanguage ->showChangeLanguageDialog()
            R.id.itmAppearance ->chooseThemeDialog()
            R.id.itmSignOut ->basicAlert()
            R.id.itmRateAndComments ->{
                val url = "https://play.google.com/store/apps/details?id=org.telegram.plus"
                if (url.startsWith("https://") || url.startsWith("http://")) {
                    val uri = Uri.parse(url)
                    val intent = Intent(Intent.ACTION_VIEW, uri)
                    startActivity(intent)
                }
            }
            R.id.itmAbout ->startActivity(Intent(this,About::class.java))
        }
        true
    }
}
private var backPressedTime:Long = 0
private lateinit var backToast: Toast
override fun onBackPressed() {
    backToast = Toast.makeText(this,resources.getString(R.string.press_back_again_to_leave_the_app), Toast.LENGTH_SHORT)
    if (backPressedTime + 2000 > System.currentTimeMillis()) {
        backToast.cancel()
        super.onBackPressed()
        return
    } else {
        backToast.show()
    }
    backPressedTime = System.currentTimeMillis()
}
private fun showChangeLanguageDialog() {
    val pref = getSharedPreferences("Settings", MODE_PRIVATE)
    val mBuilder = AlertDialog.Builder(this)
    val listItems = arrayOf("English", "فارسی دری", "پښتو")
    var checkedItem = 0
    when {
        pref.getString("My_Lang", "en").equals("en") -> {
            checkedItem = 0
        }
        pref.getString("My_Lang", "en").equals("fa") -> {
            checkedItem = 1
        }
        pref.getString("My_Lang", "en").equals("ps") -> {
            checkedItem = 2
        }
    }
    mBuilder.setSingleChoiceItems(listItems, checkedItem) { dialogInterface: DialogInterface, i: Int ->
        when (i) {
            0 -> {
                setLocale("en")
                startActivity(Intent(this,SplashScreen::class.java))
            }
            1 -> {
                setLocale("fa")
                startActivity(Intent(this,SplashScreen::class.java))
            }
            2 -> {
                setLocale("ps")
                startActivity(Intent(this,SplashScreen::class.java))
            }
        }
        dialogInterface.dismiss()
    }
    val mDialog = mBuilder.create()
    mDialog.show()
}
private fun setLocale(lang: String?) {
    val locale = Locale(lang)
    Locale.setDefault(locale)
    val config = Configuration()
    config.locale = locale
    baseContext.resources.updateConfiguration(config, baseContext.resources.displayMetrics)
    val editor = getSharedPreferences("Settings", MODE_PRIVATE).edit()
    editor.putString("My_Lang", lang)
    editor.apply()
}
private fun loadLocale() {
    val prefs = getSharedPreferences("Settings", MODE_PRIVATE)
    val language = prefs.getString("My_Lang", "")
    setLocale(language)
}
private fun basicAlert(){
    val positiveButtonClick = { _: DialogInterface, _: Int -> }
    val negativeButtonClick = { _: DialogInterface, _: Int -> }
    val builder = AlertDialog.Builder(this)
    with(builder) {
        setMessage(R.string.do_you_want_to_sign_out_from_your_my_conquer_account)
        setPositiveButton(R.string.yes, positiveButtonClick)
        setPositiveButton(R.string.yes) { _: DialogInterface, _: Int ->
            auth.signOut()
            startActivity(Intent(this@DashboardActivity, SignInActivity::class.java))
            finish()
        }
        setNegativeButton(R.string.no, negativeButtonClick)
        show()
    }
}
private fun initData(){
    auth = FirebaseAuth.getInstance()
    setUserEmail()
}
private fun setUserEmail(){
    getCurrentUserEmail()
}
private fun getCurrentUserEmail():String? {
    return auth.currentUser?.email
}
private fun chooseThemeDialog() {
    val builder = AlertDialog.Builder(this)
    val styles = arrayOf(resources.getString(R.string.light),resources.getString(R.string.dark),resources.getString(
        R.string.system_default))
    val checkedItem = MyPreferences(this).darkMode
    builder.setSingleChoiceItems(styles, checkedItem) { dialog, which ->
        when (which) {
            0 -> {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
                MyPreferences(this).darkMode = 0
                delegate.applyDayNight()
                dialog.dismiss()
            }
            1 -> {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
                MyPreferences(this).darkMode = 1
                delegate.applyDayNight()
                dialog.dismiss()
            }
            2 -> {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
                MyPreferences(this).darkMode = 2
                delegate.applyDayNight()
                dialog.dismiss()
            }
        }
    }
    val dialog = builder.create()
    dialog.show()
}
class MyPreferences(context: Context?) {
    companion object {
        private const val DARK_STATUS = ""
    }
    private val preferences = PreferenceManager.getDefaultSharedPreferences(context)
    var darkMode = preferences.getInt(DARK_STATUS, 0)
    set(value) = preferences.edit().putInt(DARK_STATUS, value).apply()
}
private fun checkTheme() {
    when (MyPreferences(this).darkMode) {
        0 -> {
            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
            delegate.applyDayNight()
        }
        1 -> {
            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
            delegate.applyDayNight()
        }
        2 -> {
            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
            delegate.applyDayNight()
        }
    }
}
private class ViewPagerAdapter(fm: FragmentManager, behavior: Int) :
    FragmentPagerAdapter(fm, behavior) {
    private val fragments: MutableList<Fragment> = ArrayList()
    private val fragmentTitle: MutableList<String> = ArrayList()
    fun addFragment(fragment: Fragment, title: String) {
        fragments.add(fragment)
        fragmentTitle.add(title)
    }
    override fun getItem(position: Int): Fragment {
        return fragments[position]
    }
    override fun getCount(): Int {
        return fragments.size
    }
    override fun getPageTitle(position: Int): CharSequence {
        return fragmentTitle[position]
    }
}
private fun getUserData() {
    val scoresRef = Firebase.database.getReference("Users")
    scoresRef.child(uid).addValueEventListener(object : ValueEventListener {
        @SuppressLint("SetTextI18n")
        override fun onDataChange(snapshot: DataSnapshot) {
            user = snapshot.getValue(User::class.java)!!
            val name = findViewById<TextView>(R.id.tvFirstNameAndLastName)
            val phoneNumber = findViewById<TextView>(R.id.tvPhoneNumber)
            findViewById<TextView>(R.id.tvFirstNameAndLastName)
            name.text = user.name+" "+user.lastName
            phoneNumber.text = user.phoneNumber
            getUserProfile()
        }
        override fun onCancelled(error: DatabaseError) {
            finish()
        }
    })
}
private fun getUserProfile() {

    val navigationView = binding.navView
    val header: View = navigationView.getHeaderView(0)
    storageReference = FirebaseStorage.getInstance().reference.child("Users/$uid")
    val localeFile = File.createTempFile("tempFile","")
    storageReference.getFile(localeFile).addOnSuccessListener {
        val bitmap = BitmapFactory.decodeFile(localeFile.absolutePath)
        val imageView = header.findViewById<ImageView>(R.id.circleImageView)
        Glide.with(this)
            .load(bitmap)
            .centerCrop()
            .into(imageView)
    }.addOnFailureListener{
        finish()
    }
}
private fun onClickListenerSearchUser(){
    binding.btnSearchUsers.setOnClickListener{
        startActivity(Intent(this,SearchUsers::class.java))
    }
}
}

和activity_dashboard.xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 
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/drawerLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".DashboardActivity">
<androidx.coordinatorlayout.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/Orange"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">
            <ImageButton
                android:id="@+id/btnSearchUsers"
                android:layout_width="wrap_content"
                android:background="#0000"
                android:layout_height="wrap_content"
                app:srcCompat="@drawable/icon_search"
                android:contentDescription="@string/todo" />
        </androidx.appcompat.widget.Toolbar>
        <com.google.android.material.tabs.TabLayout
            app:tabTextAppearance="@style/MineCustomTabText"
            android:id="@+id/tabLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </com.google.android.material.appbar.AppBarLayout>
    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<com.google.android.material.navigation.NavigationView
    android:id="@+id/navView"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:headerLayout="@layout/header"
    app:itemTextAppearance="@style/menu"
    app:menu="@menu/nav_menu" />
</androidx.drawerlayout.widget.DrawerLayout>

Answer 1

您可以使用 Locale.getDefault().getLanguage() 获取设置了何种语言的信息。将其包装在一些 if 语句中，并在 onResume 中放入 onCreate and/or （因为 lang 在 Activity 的生命周期中可能会发生变化 - 应用程序已归位，语言已更改，应用程序带回来）

viewPager?.apply {
    val localeSet = Locale.getDefault().getLanguage()
    rotationY = if (localeSet  == "ps" || localeSet  == "fa") 180f else 0f
}

如何将对 RtL 的支持添加到 viewPager Kotlin 中？

how to add support RtL into viewPager Kotlin?

android

kotlin

android-viewpager