Mimic Android Wi-Fi setting design in tethering

mobile/src/main/java/be/mygod/vpnhotspot/TetheringFragment.kt

@@ -1,7 +1,5 @@
 package be.mygod.vpnhotspot
 
-import android.animation.Animator
-import android.animation.AnimatorListenerAdapter
 import android.content.ComponentName
 import android.content.Context
 import android.content.Intent
@@ -16,9 +14,7 @@ import android.support.v7.util.SortedList
 import android.support.v7.widget.DefaultItemAnimator
 import android.support.v7.widget.LinearLayoutManager
 import android.support.v7.widget.RecyclerView
-import android.support.v7.widget.Toolbar
 import android.view.LayoutInflater
-import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
 import be.mygod.vpnhotspot.databinding.FragmentTetheringBinding
@@ -26,7 +22,12 @@ import be.mygod.vpnhotspot.databinding.ListitemInterfaceBinding
 import be.mygod.vpnhotspot.net.ConnectivityManagerHelper
 import be.mygod.vpnhotspot.net.TetherType
 
-class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClickListener {
+class TetheringFragment : Fragment(), ServiceConnection {
+    companion object {
+        private const val VIEW_TYPE_INTERFACE = 0
+        private const val VIEW_TYPE_MANAGE = 1
+    }
+
     private abstract class BaseSorter<T> : SortedList.Callback<T>() {
         override fun onInserted(position: Int, count: Int) { }
         override fun areContentsTheSame(oldItem: T?, newItem: T?): Boolean = oldItem == newItem
@@ -48,7 +49,7 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
         var active = binder?.active?.contains(iface) == true
     }
 
-    class InterfaceViewHolder(val binding: ListitemInterfaceBinding) : RecyclerView.ViewHolder(binding.root),
+    private class InterfaceViewHolder(val binding: ListitemInterfaceBinding) : RecyclerView.ViewHolder(binding.root),
             View.OnClickListener {
         init {
             itemView.setOnClickListener(this)
@@ -64,38 +65,50 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
             data.active = !data.active
         }
     }
-    inner class InterfaceAdapter : RecyclerView.Adapter<InterfaceViewHolder>() {
+    private class ManageViewHolder(view: View) : RecyclerView.ViewHolder(view), View.OnClickListener {
+        init {
+            view.setOnClickListener(this)
+        }
+
+        override fun onClick(v: View?) = itemView.context.startActivity(Intent()
+                .setClassName("com.android.settings", "com.android.settings.Settings\$TetherSettingsActivity"))
+    }
+    inner class TetheringAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
         private val tethered = SortedList(String::class.java, StringSorter)
 
         fun update(data: Set<String>) {
-            val oldEmpty = tethered.size() == 0
             tethered.clear()
             tethered.addAll(data)
             notifyDataSetChanged()
-            if (oldEmpty != data.isEmpty())
-                if (oldEmpty) crossFade(binding.empty, binding.interfaces)
-                else crossFade(binding.interfaces, binding.empty)
         }
 
-        override fun getItemCount() = tethered.size()
-        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = InterfaceViewHolder(
-                ListitemInterfaceBinding.inflate(LayoutInflater.from(parent.context), parent, false))
-        override fun onBindViewHolder(holder: InterfaceViewHolder, position: Int) {
-            holder.binding.data = Data(tethered[position])
+        override fun getItemCount() = tethered.size() + 1
+        override fun getItemViewType(position: Int) =
+                if (position == tethered.size()) VIEW_TYPE_MANAGE else VIEW_TYPE_INTERFACE
+        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
+            val inflater = LayoutInflater.from(parent.context)
+            return when (viewType) {
+                VIEW_TYPE_INTERFACE -> InterfaceViewHolder(ListitemInterfaceBinding.inflate(inflater, parent, false))
+                VIEW_TYPE_MANAGE -> ManageViewHolder(inflater.inflate(R.layout.listitem_manage, parent, false))
+                else -> throw IllegalArgumentException()
+            }
+        }
+        override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
+            when (holder) {
+                is InterfaceViewHolder -> holder.binding.data = Data(tethered[position])
+            }
         }
     }
 
     private lateinit var binding: FragmentTetheringBinding
     private var binder: TetheringService.TetheringBinder? = null
-    val adapter = InterfaceAdapter()
+    val adapter = TetheringAdapter()
     private val receiver = broadcastReceiver { _, intent ->
         adapter.update(ConnectivityManagerHelper.getTetheredIfaces(intent.extras).toSet())
     }
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         binding = DataBindingUtil.inflate(inflater, R.layout.fragment_tethering, container, false)
-        binding.toolbar.inflateMenu(R.menu.tethering)
-        binding.toolbar.setOnMenuItemClickListener(this)
         binding.interfaces.layoutManager = LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false)
         val animator = DefaultItemAnimator()
         animator.supportsChangeAnimations = false   // prevent fading-in/out when rebinding
@@ -128,25 +141,4 @@ class TetheringFragment : Fragment(), ServiceConnection, Toolbar.OnMenuItemClick
         binder?.fragment = null
         binder = null
     }
-
-    override fun onMenuItemClick(item: MenuItem) = when (item.itemId) {
-        R.id.systemTethering -> {
-            startActivity(Intent().setClassName("com.android.settings",
-                    "com.android.settings.Settings\$TetherSettingsActivity"))
-            true
-        }
-        else -> false
-    }
-
-    private fun crossFade(old: View, new: View) {
-        val shortAnimTime = resources.getInteger(android.R.integer.config_shortAnimTime).toLong()
-        old.animate().alpha(0F).setListener(object : AnimatorListenerAdapter() {
-            override fun onAnimationEnd(animation: Animator) {
-                old.visibility = View.GONE
-            }
-        }).duration = shortAnimTime
-        new.alpha = 0F
-        new.visibility = View.VISIBLE
-        new.animate().alpha(1F).setListener(null).duration = shortAnimTime
-    }
 }

mobile/src/main/res/drawable/ic_content_add.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M19,13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/>
+</vector>

mobile/src/main/res/layout/fragment_tethering.xml

@@ -12,28 +12,15 @@
             android:layout_width="match_parent"
             android:background="?attr/colorPrimary"
             android:elevation="4dp"
-            android:touchscreenBlocksFocus="false"
             app:title="@string/app_name"
             android:id="@+id/toolbar"/>
-        <FrameLayout
+        <android.support.v7.widget.RecyclerView
+            android:id="@+id/interfaces"
             android:layout_width="match_parent"
             android:layout_height="0dp"
-            android:layout_weight="1">
-            <TextView
-                android:id="@+id/empty"
-                android:layout_width="match_parent"
-                android:layout_height="match_parent"
-                android:padding="16dp"
-                android:text="@string/tethering_no_interfaces"/>
-            <android.support.v7.widget.RecyclerView
-                android:id="@+id/interfaces"
-                android:layout_width="match_parent"
-                android:layout_height="match_parent"
-                android:clipToPadding="false"
-                android:scrollbars="vertical"
-                android:visibility="gone"
-                tools:listitem="@layout/listitem_interface"
-                tools:visibility="visible"/>
-        </FrameLayout>
+            android:layout_weight="1"
+            android:clipToPadding="false"
+            android:scrollbars="vertical"
+            tools:listitem="@layout/listitem_interface"/>
     </LinearLayout>
 </layout>

mobile/src/main/res/layout/listitem_client.xml

@@ -11,10 +11,10 @@
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:paddingBottom="4dp"
+        android:paddingBottom="8dp"
         android:paddingEnd="16dp"
         android:paddingStart="16dp"
-        android:paddingTop="4dp">
+        android:paddingTop="8dp">
 
         <ImageView
             android:layout_width="wrap_content"

mobile/src/main/res/layout/listitem_interface.xml

@@ -12,14 +12,12 @@
         android:layout_height="wrap_content"
         android:focusable="true"
         android:background="?android:attr/selectableItemBackground"
-        android:paddingBottom="8dp"
-        android:paddingEnd="16dp"
-        android:paddingStart="16dp"
-        android:paddingTop="8dp">
+        android:padding="16dp">
 
         <ImageView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
             android:src="@{data.icon}"
             android:tint="?android:attr/textColorPrimary"
             tools:src="@drawable/ic_device_network_wifi"/>
@@ -32,13 +30,14 @@
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
+            android:layout_gravity="center_vertical"
+            android:checked="@{data.active}"
             android:clickable="false"
             android:ellipsize="end"
             android:focusable="false"
             android:focusableInTouchMode="false"
             android:gravity="center_vertical"
             android:text="@{data.iface}"
-            android:checked="@{data.active}"
             tools:text="wlan0"/>
 
     </LinearLayout>

mobile/src/main/res/layout/listitem_manage.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:focusable="true"
+    android:background="?android:attr/selectableItemBackground"
+    android:padding="16dp">
+
+    <ImageView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:src="@drawable/ic_content_add"
+        android:tint="@color/colorAccent"/>
+
+    <Space
+        android:layout_width="16dp"
+        android:layout_height="0dp"/>
+
+    <TextView
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:layout_gravity="center_vertical"
+        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
+        android:text="Manage..."/>
+
+</LinearLayout>

mobile/src/main/res/menu/tethering.xml

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-      xmlns:app="http://schemas.android.com/apk/res-auto">
-
-    <item
-        android:id="@+id/systemTethering"
-        android:icon="@drawable/ic_action_settings"
-        android:title="@string/tethering_system_tethering"
-        app:showAsAction="ifRoom"/>
-</menu>

mobile/src/main/res/values/strings.xml

@@ -37,9 +37,6 @@
     <string name="repeater_failure_reason_no_service_requests">no service requests added</string>
     <string name="repeater_failure_reason_unknown">unknown #%d</string>
 
-    <string name="tethering_system_tethering">System tethering</string>
-    <string name="tethering_no_interfaces">To use this feature, turn on any system tethering first.</string>
-
     <string name="settings_service">Service</string>
     <string name="settings_service_dns">Downstream DNS server:port</string>
     <string name="settings_service_clean">Clean/reapply routing rules</string>