Fix some compile warnings

Migrate to viewpager2

V2rayNG/app/build.gradle

@@ -83,6 +83,7 @@ dependencies {
     implementation "androidx.preference:preference:1.0.0"
     implementation "androidx.recyclerview:recyclerview:1.2.1"
     implementation 'androidx.multidex:multidex:2.0.1'
+    implementation 'androidx.viewpager2:viewpager2:1.0.0'
 
     // Androidx ktx
     implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'

V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/FragmentAdapter.kt

@@ -1,21 +1,17 @@
 package com.v2ray.ang.ui
 
-
 import androidx.fragment.app.Fragment
-import androidx.fragment.app.FragmentManager
-import androidx.fragment.app.FragmentStatePagerAdapter
+import androidx.fragment.app.FragmentActivity
+import androidx.viewpager2.adapter.FragmentStateAdapter
 
-class FragmentAdapter(fm: FragmentManager, private val mFragments: List<Fragment>, private val mTitles: List<String>) : FragmentStatePagerAdapter(fm) {
+class FragmentAdapter(fragmentActivity: FragmentActivity, private val mFragments: List<Fragment>) :
+        FragmentStateAdapter(fragmentActivity) {
 
-    override fun getItem(position: Int): Fragment {
+    override fun createFragment(position: Int): Fragment {
         return mFragments[position]
     }
 
-    override fun getCount(): Int {
+    override fun getItemCount(): Int {
         return mFragments.size
     }
-
-    override fun getPageTitle(position: Int): CharSequence? {
-        return mTitles[position]
-    }
 }

V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/RoutingSettingsActivity.kt

@@ -4,10 +4,10 @@ import android.graphics.Color
 import android.os.Bundle
 import com.v2ray.ang.R
 import androidx.fragment.app.Fragment
+import com.google.android.material.tabs.TabLayoutMediator
 import com.v2ray.ang.AppConfig
 import com.v2ray.ang.databinding.ActivityRoutingSettingsBinding
 
-
 class RoutingSettingsActivity : BaseActivity() {
     private lateinit var binding: ActivityRoutingSettingsBinding
 
@@ -29,9 +29,11 @@ class RoutingSettingsActivity : BaseActivity() {
         fragments.add(RoutingSettingsFragment().newInstance(AppConfig.PREF_V2RAY_ROUTING_DIRECT))
         fragments.add(RoutingSettingsFragment().newInstance(AppConfig.PREF_V2RAY_ROUTING_BLOCKED))
 
-        val adapter = FragmentAdapter(supportFragmentManager, fragments, titles.toList())
+        val adapter = FragmentAdapter(this, fragments)
         binding.viewpager.adapter = adapter
         binding.tablayout.setTabTextColors(Color.BLACK, Color.RED)
-        binding.tablayout.setupWithViewPager(binding.viewpager)
+        TabLayoutMediator(binding.tablayout, binding.viewpager) { tab, position ->
+            tab.text = titles[position]
+        }.attach()
     }
 }

V2rayNG/app/src/main/res/layout/activity_routing_settings.xml

@@ -9,7 +9,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
 
-    <androidx.viewpager.widget.ViewPager
+    <androidx.viewpager2.widget.ViewPager2
         android:id="@+id/viewpager"
         android:layout_width="match_parent"
         android:layout_height="match_parent" />