Show Registered Hosts in Settings on Android

android/app/src/main/java/com/metallic/chiaki/common/RegisteredHost.kt

@@ -65,6 +65,9 @@ interface RegisteredHostDao
 	@Query("DELETE FROM registered_host WHERE ps4_mac == :mac")
 	fun deleteByMac(mac: MacAddress): Completable
 
+	@Query("SELECT COUNT(*) FROM registered_host")
+	fun count(): Flowable<Int>
+
 	@Insert
 	fun insert(host: RegisteredHost): Single<Long>
 }

android/app/src/main/java/com/metallic/chiaki/settings/SettingsActivity.kt

@@ -17,12 +17,24 @@
 
 package com.metallic.chiaki.settings
 
+import android.content.res.Resources
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.Fragment
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+import androidx.transition.TransitionManager
 import com.metallic.chiaki.R
+import kotlinx.android.synthetic.main.activity_main.*
 import kotlinx.android.synthetic.main.activity_settings.*
+import kotlinx.android.synthetic.main.activity_settings.toolbar
 
-class SettingsActivity: AppCompatActivity()
+interface TitleFragment
+{
+	fun getTitle(resources: Resources): String
+}
+
+class SettingsActivity: AppCompatActivity(), PreferenceFragmentCompat.OnPreferenceStartFragmentCallback
 {
 	override fun onCreate(savedInstanceState: Bundle?)
 	{
@@ -30,5 +42,34 @@ class SettingsActivity: AppCompatActivity()
 		setContentView(R.layout.activity_settings)
 		title = ""
 		setSupportActionBar(toolbar)
+
+		val rootFragment = SettingsFragment()
+		replaceFragment(rootFragment, false)
+		supportFragmentManager.addOnBackStackChangedListener {
+			val titleFragment = supportFragmentManager.findFragmentById(R.id.settingsFragment) as? TitleFragment ?: return@addOnBackStackChangedListener
+			titleTextView.text = titleFragment.getTitle(resources)
+		}
+		titleTextView.text = rootFragment.getTitle(resources)
+	}
+
+	override fun onPreferenceStartFragment(caller: PreferenceFragmentCompat, pref: Preference) = when(pref.fragment)
+	{
+		SettingsRegisteredHostsFragment::class.java.canonicalName -> {
+			replaceFragment(SettingsRegisteredHostsFragment(), true)
+			true
+		}
+		else -> false
+	}
+
+	private fun replaceFragment(fragment: Fragment, addToBackStack: Boolean)
+	{
+		supportFragmentManager.beginTransaction()
+			.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out)
+			.replace(R.id.settingsFragment, fragment)
+			.also {
+				if(addToBackStack)
+					it.addToBackStack(null)
+			}
+			.commit()
 	}
 }

android/app/src/main/java/com/metallic/chiaki/settings/SettingsFragment.kt

@@ -17,14 +17,33 @@
 
 package com.metallic.chiaki.settings
 
+import android.content.res.Resources
 import android.os.Bundle
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProviders
+import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import com.metallic.chiaki.R
+import com.metallic.chiaki.common.AppDatabase
+import com.metallic.chiaki.common.ext.viewModelFactory
+import com.metallic.chiaki.common.getDatabase
 
-class SettingsFragment: PreferenceFragmentCompat()
+class SettingsFragment: PreferenceFragmentCompat(), TitleFragment
 {
 	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?)
 	{
 		setPreferencesFromResource(R.xml.preferences, rootKey)
+
+		val registeredHostsPreference = preferenceScreen.findPreference<Preference>("registered_hosts")
+
+		val viewModel = ViewModelProviders
+			.of(this, viewModelFactory { SettingsViewModel(getDatabase(context!!)) })
+			.get(SettingsViewModel::class.java)
+
+		viewModel.registeredHostsCount.observe(this, Observer {
+			registeredHostsPreference?.summary = getString(R.string.preferences_registered_hosts_summary, it)
+		})
 	}
+
+	override fun getTitle(resources: Resources): String = resources.getString(R.string.title_settings)
 }

android/app/src/main/java/com/metallic/chiaki/settings/SettingsRegisteredHostsFragment.kt

@@ -0,0 +1,56 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.metallic.chiaki.settings
+
+import android.content.res.Resources
+import android.os.Bundle
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProviders
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+import com.metallic.chiaki.R
+import com.metallic.chiaki.common.ext.viewModelFactory
+import com.metallic.chiaki.common.getDatabase
+
+class SettingsRegisteredHostsFragment: PreferenceFragmentCompat(), TitleFragment
+{
+	private lateinit var viewModel: SettingsRegisteredHostsViewModel
+
+	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?)
+	{
+		val context = preferenceManager.context
+		preferenceScreen = preferenceManager.createPreferenceScreen(context)
+
+		viewModel = ViewModelProviders
+			.of(this, viewModelFactory { SettingsRegisteredHostsViewModel(getDatabase(context!!)) })
+			.get(SettingsRegisteredHostsViewModel::class.java)
+
+		viewModel.registeredHosts.observe(this, Observer {
+			preferenceScreen.removeAll()
+			it.forEach { host ->
+				val pref = Preference(context)
+				pref.title = host.ps4Nickname
+				pref.summary = host.ps4Mac.toString()
+				preferenceScreen.addPreference(pref)
+			}
+		})
+
+	}
+
+	override fun getTitle(resources: Resources): String = resources.getString(R.string.preferences_registered_hosts_title)
+}

android/app/src/main/java/com/metallic/chiaki/settings/SettingsRegisteredHostsViewModel.kt

@@ -0,0 +1,29 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.metallic.chiaki.settings
+
+import androidx.lifecycle.ViewModel
+import com.metallic.chiaki.common.AppDatabase
+import com.metallic.chiaki.common.ext.toLiveData
+
+class SettingsRegisteredHostsViewModel(val database: AppDatabase): ViewModel()
+{
+	val registeredHosts by lazy {
+		database.registeredHostDao().getAll().toLiveData()
+	}
+}

android/app/src/main/java/com/metallic/chiaki/settings/SettingsViewModel.kt

@@ -0,0 +1,29 @@
+/*
+ * This file is part of Chiaki.
+ *
+ * Chiaki is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chiaki is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Chiaki.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.metallic.chiaki.settings
+
+import androidx.lifecycle.ViewModel
+import com.metallic.chiaki.common.AppDatabase
+import com.metallic.chiaki.common.ext.toLiveData
+
+class SettingsViewModel(val database: AppDatabase): ViewModel()
+{
+	val registeredHostsCount by lazy {
+		database.registeredHostDao().count().toLiveData()
+	}
+}

android/app/src/main/res/layout/activity_settings.xml

@@ -12,21 +12,21 @@
         app:layout_constraintTop_toTopOf="parent"
         android:theme="@style/AppTheme.Toolbar">
         <androidx.appcompat.widget.AppCompatTextView
+            android:id="@+id/titleTextView"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_gravity="center"
             android:fontFamily="sans-serif-condensed"
             android:text="@string/title_settings"
             android:textColor="?attr/colorOnPrimary"
-            android:textSize="20dp" />
+            android:textSize="20dp"/>
     </com.google.android.material.appbar.MaterialToolbar>
 
-    <fragment
-        android:id="@+id/settingsFragment"
+    <FrameLayout
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:name="com.metallic.chiaki.settings.SettingsFragment"
+        android:id="@+id/settingsFragment"
         app:layout_constraintTop_toBottomOf="@id/toolbar"
-        app:layout_constraintBottom_toBottomOf="parent"/>
+        app:layout_constraintBottom_toBottomOf="parent" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

android/app/src/main/res/xml/preferences.xml

@@ -1,12 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto">
+<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:android="http://schemas.android.com/apk/res/android">
     <PreferenceCategory
         app:key="category_general"
         app:title="@string/preferences_category_title_general">
         <Preference
             app:key="registered_hosts"
-            app:summary="@string/preferences_registered_hosts_summary"
-            app:title="@string/preferences_registered_hosts_title"/>
+            tools:summary="@string/preferences_registered_hosts_summary"
+            app:summary=" "
+            app:title="@string/preferences_registered_hosts_title"
+            app:fragment="com.metallic.chiaki.settings.SettingsRegisteredHostsFragment"/>
     </PreferenceCategory>
 
     <PreferenceCategory