PageViewFragment: handle home page

app/build.gradle

@@ -39,14 +39,21 @@ android {
 }
 
 dependencies {
+    def nav_version = "2.3.5"
+    def room_version = "2.4.0"
     implementation 'androidx.core:core-ktx:1.7.0'
     implementation 'androidx.appcompat:appcompat:1.4.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.2'
-    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.0"
+    implementation 'androidx.fragment:fragment-ktx:1.4.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.0'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation "androidx.room:room-runtime:2.4.0"
+    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
+    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
+    implementation 'androidx.preference:preference-ktx:1.1.1'
+    implementation "androidx.room:room-runtime:$room_version"
+    implementation "androidx.room:room-ktx:$room_version"
     implementation 'com.google.android.material:material:1.4.0'
-    kapt "androidx.room:room-compiler:2.4.0"
+    kapt "androidx.room:room-compiler:$room_version"
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

app/src/main/java/dev/lowrespalmtree/comet/ContentAdapter.kt

@@ -19,7 +19,7 @@ import dev.lowrespalmtree.comet.databinding.*
  * it could be a n-to-1 relation: many lines belong to the same block. This of course changes a bit
  * the way we have to render things.
  */
-class ContentAdapter(private val listener: ContentAdapterListen) :
+class ContentAdapter(private val listener: ContentAdapterListener) :
     RecyclerView.Adapter<ContentAdapter.ContentViewHolder>() {
 
     private var lines = listOf<Line>()
@@ -27,7 +27,7 @@ class ContentAdapter(private val listener: ContentAdapterListen) :
     private var blocks = mutableListOf<ContentBlock>()
     private var lastBlockCount = 0
 
-    interface ContentAdapterListen {
+    interface ContentAdapterListener {
         fun onLinkClick(url: String)
     }
 
@@ -161,15 +161,15 @@ class ContentAdapter(private val listener: ContentAdapterListen) :
     override fun getItemCount(): Int = blocks.size
 
     companion object {
-        const val TAG = "ContentRecycler"
-        const val TYPE_EMPTY = 0
-        const val TYPE_TITLE_1 = 1
-        const val TYPE_TITLE_2 = 2
-        const val TYPE_TITLE_3 = 3
-        const val TYPE_PARAGRAPH = 4
-        const val TYPE_LINK = 5
-        const val TYPE_PREFORMATTED = 6
-        const val TYPE_BLOCKQUOTE = 7
-        const val TYPE_LIST_ITEM = 8
+        private const val TAG = "ContentRecycler"
+        private const val TYPE_EMPTY = 0
+        private const val TYPE_TITLE_1 = 1
+        private const val TYPE_TITLE_2 = 2
+        private const val TYPE_TITLE_3 = 3
+        private const val TYPE_PARAGRAPH = 4
+        private const val TYPE_LINK = 5
+        private const val TYPE_PREFORMATTED = 6
+        private const val TYPE_BLOCKQUOTE = 7
+        private const val TYPE_LIST_ITEM = 8
     }
 }

app/src/main/java/dev/lowrespalmtree/comet/Gemtext.kt

@@ -19,7 +19,7 @@ class PreTextLine(val text: String) : Line
 class BlockquoteLine(val text: String) : Line
 class ListItemLine(val text: String) : Line
 
-const val TAG = "Gemtext"
+private const val TAG = "Gemtext"
 
 /** Pipe incoming gemtext data into parsed Lines. */
 fun parseData(

app/src/main/java/dev/lowrespalmtree/comet/History.kt

@@ -13,19 +13,22 @@ object History {
     @Dao
     interface HistoryEntryDao {
         @Query("SELECT * FROM HistoryEntry WHERE :uri = uri LIMIT 1")
-        fun get(uri: String): HistoryEntry?
+        suspend fun get(uri: String): HistoryEntry?
 
         @Query("SELECT * FROM HistoryEntry ORDER BY lastVisit DESC")
-        fun getAll(): List<HistoryEntry>
+        suspend fun getAll(): List<HistoryEntry>
+
+        @Query("SELECT * FROM HistoryEntry ORDER BY lastVisit DESC LIMIT 1")
+        suspend fun getLast(): HistoryEntry?
 
         @Insert(onConflict = OnConflictStrategy.IGNORE)
-        fun insert(vararg entries: HistoryEntry)
+        suspend fun insert(vararg entries: HistoryEntry)
 
         @Update
-        fun update(vararg entries: HistoryEntry)
+        suspend fun update(vararg entries: HistoryEntry)
     }
 
-    fun record(uri: String, title: String?) {
+    suspend fun record(uri: String, title: String?) {
         val now = System.currentTimeMillis()
         val dao = Database.INSTANCE.historyEntryDao()
         val entry = dao.get(uri)
@@ -34,4 +37,6 @@ object History {
         else
             dao.update(entry.also { it.title = title; it.lastVisit = now })
     }
+
+    suspend fun getLast(): HistoryEntry? = Database.INSTANCE.historyEntryDao().getLast()
 }

app/src/main/java/dev/lowrespalmtree/comet/MainActivity.kt

@@ -1,201 +1,23 @@
 package dev.lowrespalmtree.comet
 
-import android.app.Activity
-import android.content.ActivityNotFoundException
-import android.content.Intent
-import android.content.Intent.ACTION_VIEW
-import android.net.Uri
 import android.os.Bundle
-import android.text.InputType
-import android.util.Log
-import android.view.inputmethod.EditorInfo
-import android.view.inputmethod.InputMethodManager
-import android.widget.EditText
-import android.widget.FrameLayout
-import android.widget.FrameLayout.LayoutParams.MATCH_PARENT
-import android.widget.FrameLayout.LayoutParams.WRAP_CONTENT
-import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.setMargins
-import androidx.lifecycle.ViewModelProvider
-import androidx.recyclerview.widget.LinearLayoutManager
-import dev.lowrespalmtree.comet.databinding.ActivityMainBinding
+import androidx.navigation.fragment.NavHostFragment
+import androidx.navigation.ui.setupWithNavController
+import com.google.android.material.navigation.NavigationView
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 
-
 @ExperimentalCoroutinesApi
-class MainActivity : AppCompatActivity(), ContentAdapter.ContentAdapterListen {
-    private lateinit var binding: ActivityMainBinding
-    private lateinit var pageViewModel: PageViewModel
-    private lateinit var adapter: ContentAdapter
-
-    /** Property to access and set the current address bar URL value. */
-    private var currentUrl
-        get() = binding.addressBar.text.toString()
-        set(value) = binding.addressBar.setText(value)
-
-    /** A non-saved list of visited URLs. Not an history, just used for going back. */
-    private val visitedUrls = mutableListOf<String>()
-
+class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        Database.init(applicationContext)  // TODO move to App Startup?
 
-        Database.init(applicationContext)
-
-        binding = ActivityMainBinding.inflate(layoutInflater)
-        setContentView(binding.root)
-
-        pageViewModel = ViewModelProvider(this)[PageViewModel::class.java]
-        adapter = ContentAdapter(this)
-        binding.contentRecycler.layoutManager = LinearLayoutManager(this)
-        binding.contentRecycler.adapter = adapter
-
-        binding.addressBar.setOnEditorActionListener { view, actionId, _ ->
-            if (actionId == EditorInfo.IME_ACTION_DONE) {
-                openUrl(view.text.toString())
-                val imm = getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
-                imm.hideSoftInputFromWindow(view.windowToken, 0)
-                view.clearFocus()
-                true
-            } else {
-                false
+        supportFragmentManager.findFragmentById(R.id.nav_host_fragment)?.also { navHost ->
+            findViewById<NavigationView>(R.id.drawer_navigation)?.apply {
+                setupWithNavController((navHost as NavHostFragment).navController)
             }
         }
-
-        binding.contentSwipeLayout.setOnRefreshListener { openUrl(currentUrl) }
-
-        pageViewModel.state.observe(this, { updateState(it) })
-        pageViewModel.lines.observe(this, { updateLines(it) })
-        pageViewModel.event.observe(this, { handleEvent(it) })
-    }
-
-    override fun onBackPressed() {
-        visitedUrls.removeLastOrNull()  // Always remove current page first.
-        val previousUrl = visitedUrls.removeLastOrNull()
-        if (previousUrl != null)
-            openUrl(previousUrl)
-        else
-            super.onBackPressed()
-    }
-
-    override fun onLinkClick(url: String) {
-        openUrl(url, base = if (currentUrl.isNotEmpty()) currentUrl else null)
-    }
-
-    /**
-     * Open an URL.
-     *
-     * This function can be called after the user entered an URL in the app bar, clicked on a link,
-     * whatever. To make the user's life a bit easier, this function also makes a few guesses:
-     * - If the URL is not absolute, make it so from a base URL (e.g. the current URL) or assume
-     *   the user only typed a hostname without scheme and use a utility function to make it
-     *   absolute.
-     * - If it's an absolute Gemini URL with an empty path, use "/" instead as per the spec.
-     */
-    private fun openUrl(url: String, base: String? = null, redirections: Int = 0) {
-        if (redirections >= 5) {
-            alert("Too many redirections.")
-            return
-        }
-
-        var uri = Uri.parse(url)
-        if (!uri.isAbsolute) {
-            uri = if (!base.isNullOrEmpty()) joinUrls(base, url) else toGeminiUri(uri)
-        } else if (uri.scheme == "gemini" && uri.path.isNullOrEmpty()) {
-            uri = uri.buildUpon().path("/").build()
-        }
-
-        when (uri.scheme) {
-            "gemini" -> pageViewModel.sendGeminiRequest(uri)
-            else -> openUnknownScheme(uri)
-        }
-    }
-
-    private fun updateState(state: PageViewModel.State) {
-        Log.d(TAG, "updateState: $state")
-        when (state) {
-            PageViewModel.State.IDLE -> {
-                binding.contentProgressBar.hide()
-                binding.contentSwipeLayout.isRefreshing = false
-            }
-            PageViewModel.State.CONNECTING -> {
-                binding.contentProgressBar.show()
-            }
-            PageViewModel.State.RECEIVING -> {
-                binding.appBar.setExpanded(true, true)
-                binding.contentSwipeLayout.isRefreshing = false
-            }
-        }
-    }
-
-    private fun updateLines(lines: List<Line>) {
-        Log.d(TAG, "updateLines: ${lines.size} lines")
-        adapter.setLines(lines)
-    }
-
-    private fun handleEvent(event: PageViewModel.Event) {
-        Log.d(TAG, "handleEvent: $event")
-        if (!event.handled) {
-            when (event) {
-                is PageViewModel.InputEvent -> {
-                    val editText = EditText(this).apply { inputType = InputType.TYPE_CLASS_TEXT }
-                    val inputView = FrameLayout(this).apply {
-                        addView(FrameLayout(this@MainActivity).apply {
-                            addView(editText)
-                            val params = FrameLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT)
-                            params.setMargins(resources.getDimensionPixelSize(R.dimen.text_margin))
-                            layoutParams = params
-                        })
-                    }
-                    AlertDialog.Builder(this)
-                        .setMessage(if (event.prompt.isNotEmpty()) event.prompt else "Input required")
-                        .setView(inputView)
-                        .setPositiveButton(android.R.string.ok) { _, _ ->
-                            val newUri = event.uri.buildUpon().query(editText.text.toString()).build()
-                            openUrl(newUri.toString(), base = currentUrl)
-                        }
-                        .setOnDismissListener { updateState(PageViewModel.State.IDLE) }
-                        .create()
-                        .show()
-                }
-                is PageViewModel.SuccessEvent -> {
-                    currentUrl = event.uri
-                    visitedUrls.add(event.uri)
-                }
-                is PageViewModel.RedirectEvent -> {
-                    openUrl(event.uri, base = currentUrl, redirections = event.redirects)
-                }
-                is PageViewModel.FailureEvent -> {
-                    var message = event.details
-                    if (!event.serverDetails.isNullOrEmpty())
-                        message += "\n\nServer details: ${event.serverDetails}"
-                    if (!isConnectedToNetwork(this))
-                        message += "\n\nInternet may be inaccessible…"
-                    alert(message, title = event.short)
-                    updateState(PageViewModel.State.IDLE)
-                }
-            }
-            event.handled = true
-        }
-    }
-
-    private fun alert(message: String, title: String? = null) {
-        AlertDialog.Builder(this)
-            .setTitle(title ?: getString(R.string.error_alert_title))
-            .setMessage(message)
-            .create()
-            .show()
-    }
-
-    private fun openUnknownScheme(uri: Uri) {
-        try {
-            startActivity(Intent(ACTION_VIEW, uri))
-        } catch (e: ActivityNotFoundException) {
-            alert("Can't find an app to open \"${uri.scheme}\" URLs.")
-        }
-    }
-
-    companion object {
-        const val TAG = "MainActivity"
     }
 }

app/src/main/java/dev/lowrespalmtree/comet/PageViewFragment.kt

@@ -0,0 +1,225 @@
+package dev.lowrespalmtree.comet
+
+import android.app.Activity
+import android.content.ActivityNotFoundException
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import android.text.InputType
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.view.inputmethod.EditorInfo
+import android.view.inputmethod.InputMethodManager
+import android.widget.EditText
+import android.widget.FrameLayout
+import android.widget.TextView
+import androidx.activity.addCallback
+import androidx.appcompat.app.AlertDialog
+import androidx.core.view.setMargins
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import androidx.preference.PreferenceManager
+import androidx.recyclerview.widget.LinearLayoutManager
+import dev.lowrespalmtree.comet.databinding.FragmentPageViewBinding
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+
+@ExperimentalCoroutinesApi
+class PageViewFragment : Fragment(), ContentAdapter.ContentAdapterListener {
+    private lateinit var binding: FragmentPageViewBinding
+    private lateinit var pageViewModel: PageViewModel
+    private lateinit var adapter: ContentAdapter
+
+    /** Property to access and set the current address bar URL value. */
+    private var currentUrl
+        get() = binding.addressBar.text.toString()
+        set(value) = binding.addressBar.setText(value)
+
+    /** A non-saved list of visited URLs. Not an history, just used for going back. */
+    private val visitedUrls = mutableListOf<String>()
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        binding = FragmentPageViewBinding.inflate(layoutInflater)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        pageViewModel = ViewModelProvider(this)[PageViewModel::class.java]
+        adapter = ContentAdapter(this)
+        binding.contentRecycler.layoutManager = LinearLayoutManager(requireContext())
+        binding.contentRecycler.adapter = adapter
+
+        binding.addressBar.setOnEditorActionListener { v, id, _ -> onAddressBarAction(v, id) }
+
+        binding.contentSwipeLayout.setOnRefreshListener { openUrl(currentUrl) }
+
+        pageViewModel.state.observe(viewLifecycleOwner, { updateState(it) })
+        pageViewModel.lines.observe(viewLifecycleOwner, { updateLines(it) })
+        pageViewModel.event.observe(viewLifecycleOwner, { handleEvent(it) })
+
+        activity?.onBackPressedDispatcher?.addCallback(viewLifecycleOwner) { onBackPressed() }
+
+        if (visitedUrls.isEmpty()) {
+            PreferenceManager.getDefaultSharedPreferences(requireContext())
+                .getString("home", null)?.let { openUrl(it) }
+        }
+    }
+
+    override fun onLinkClick(url: String) {
+        openUrl(url, base = if (currentUrl.isNotEmpty()) currentUrl else null)
+    }
+
+    private fun onBackPressed() {
+        if (visitedUrls.size >= 2) {
+            visitedUrls.removeLastOrNull()  // Always remove current page first.
+            openUrl(visitedUrls.removeLastOrNull()!!)
+        }
+    }
+
+    private fun onAddressBarAction(addressBar: TextView, actionId: Int): Boolean {
+        if (actionId == EditorInfo.IME_ACTION_DONE) {
+            openUrl(addressBar.text.toString())
+            activity?.run {
+                val imm = getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
+                imm.hideSoftInputFromWindow(addressBar.windowToken, 0)
+            }
+            addressBar.clearFocus()
+            return true
+        }
+        return false
+    }
+
+    /**
+     * Open an URL.
+     *
+     * This function can be called after the user entered an URL in the app bar, clicked on a link,
+     * whatever. To make the user's life a bit easier, this function also makes a few guesses:
+     * - If the URL is not absolute, make it so from a base URL (e.g. the current URL) or assume
+     *   the user only typed a hostname without scheme and use a utility function to make it
+     *   absolute.
+     * - If it's an absolute Gemini URL with an empty path, use "/" instead as per the spec.
+     */
+    private fun openUrl(url: String, base: String? = null, redirections: Int = 0) {
+        if (redirections >= 5) {
+            alert("Too many redirections.")
+            return
+        }
+
+        var uri = Uri.parse(url)
+        if (!uri.isAbsolute) {
+            uri = if (!base.isNullOrEmpty()) joinUrls(base, url) else toGeminiUri(uri)
+        } else if (uri.scheme == "gemini" && uri.path.isNullOrEmpty()) {
+            uri = uri.buildUpon().path("/").build()
+        }
+
+        when (uri.scheme) {
+            "gemini" -> {
+                val prefs = PreferenceManager.getDefaultSharedPreferences(requireContext())
+                val connectionTimeout =
+                    prefs.getInt("connection_timeout", Request.DEFAULT_CONNECTION_TIMEOUT_SEC)
+                val readTimeout =
+                    prefs.getInt("read_timeout", Request.DEFAULT_READ_TIMEOUT_SEC)
+                pageViewModel.sendGeminiRequest(uri, connectionTimeout, readTimeout)
+            }
+            else -> openUnknownScheme(uri)
+        }
+    }
+
+    private fun updateState(state: PageViewModel.State) {
+        Log.d(TAG, "updateState: $state")
+        when (state) {
+            PageViewModel.State.IDLE -> {
+                binding.contentProgressBar.hide()
+                binding.contentSwipeLayout.isRefreshing = false
+            }
+            PageViewModel.State.CONNECTING -> {
+                binding.contentProgressBar.show()
+            }
+            PageViewModel.State.RECEIVING -> {
+                binding.appBarLayout.setExpanded(true, true)
+                binding.contentSwipeLayout.isRefreshing = false
+            }
+        }
+    }
+
+    private fun updateLines(lines: List<Line>) {
+        Log.d(TAG, "updateLines: ${lines.size} lines")
+        adapter.setLines(lines)
+    }
+
+    private fun handleEvent(event: PageViewModel.Event) {
+        Log.d(TAG, "handleEvent: $event")
+        if (!event.handled) {
+            when (event) {
+                is PageViewModel.InputEvent -> {
+                    val editText = EditText(requireContext())
+                    editText.inputType = InputType.TYPE_CLASS_TEXT
+                    val inputView = FrameLayout(requireContext()).apply {
+                        addView(FrameLayout(requireContext()).apply {
+                            addView(editText)
+                            val params = FrameLayout.LayoutParams(
+                                FrameLayout.LayoutParams.MATCH_PARENT,
+                                FrameLayout.LayoutParams.WRAP_CONTENT
+                            )
+                            params.setMargins(resources.getDimensionPixelSize(R.dimen.text_margin))
+                            layoutParams = params
+                        })
+                    }
+                    AlertDialog.Builder(requireContext())
+                        .setMessage(if (event.prompt.isNotEmpty()) event.prompt else "Input required")
+                        .setView(inputView)
+                        .setPositiveButton(android.R.string.ok) { _, _ ->
+                            val newUri =
+                                event.uri.buildUpon().query(editText.text.toString()).build()
+                            openUrl(newUri.toString(), base = currentUrl)
+                        }
+                        .setOnDismissListener { updateState(PageViewModel.State.IDLE) }
+                        .create()
+                        .show()
+                }
+                is PageViewModel.SuccessEvent -> {
+                    currentUrl = event.uri
+                    visitedUrls.add(event.uri)
+                }
+                is PageViewModel.RedirectEvent -> {
+                    openUrl(event.uri, base = currentUrl, redirections = event.redirects)
+                }
+                is PageViewModel.FailureEvent -> {
+                    var message = event.details
+                    if (!event.serverDetails.isNullOrEmpty())
+                        message += "\n\nServer details: ${event.serverDetails}"
+                    if (!isConnectedToNetwork(requireContext()))
+                        message += "\n\nInternet may be inaccessible…"
+                    alert(message, title = event.short)
+                    updateState(PageViewModel.State.IDLE)
+                }
+            }
+            event.handled = true
+        }
+    }
+
+    private fun alert(message: String, title: String? = null) {
+        AlertDialog.Builder(requireContext())
+            .setTitle(title ?: getString(R.string.error_alert_title))
+            .setMessage(message)
+            .create()
+            .show()
+    }
+
+    private fun openUnknownScheme(uri: Uri) {
+        try {
+            startActivity(Intent(Intent.ACTION_VIEW, uri))
+        } catch (e: ActivityNotFoundException) {
+            alert("Can't find an app to open \"${uri.scheme}\" URLs.")
+        }
+    }
+
+    companion object {
+        private const val TAG = "PageViewFragment"
+    }
+}

app/src/main/java/dev/lowrespalmtree/comet/PageViewModel.kt

@@ -39,14 +39,14 @@ class PageViewModel : ViewModel() {
      *
      * The URI must be valid, absolute and with a gemini scheme.
      */
-    fun sendGeminiRequest(uri: Uri, redirects: Int = 0) {
+    fun sendGeminiRequest(uri: Uri, connectionTimeout: Int, readTimeout: Int, redirects: Int = 0) {
         Log.d(TAG, "sendRequest: URI \"$uri\"")
         state.postValue(State.CONNECTING)
         requestJob?.apply { if (isActive) cancel() }
         requestJob = viewModelScope.launch(Dispatchers.IO) {
             val response = try {
                 val request = Request(uri)
-                val socket = request.connect()
+                val socket = request.connect(connectionTimeout, readTimeout)
                 val channel = request.proceed(socket, this)
                 Response.from(channel, viewModelScope)
             } catch (e: Exception) {
@@ -184,6 +184,6 @@ class PageViewModel : ViewModel() {
     }
 
     companion object {
-        const val TAG = "PageViewModel"
+        private const val TAG = "PageViewModel"
     }
 }

app/src/main/java/dev/lowrespalmtree/comet/Request.kt

@@ -17,13 +17,13 @@ import javax.net.ssl.X509TrustManager
 class Request(private val uri: Uri) {
     private val port get() = if (uri.port > 0) uri.port else 1965
 
-    fun connect(): SSLSocket {
+    fun connect(connectionTimeout: Int, readTimeout: Int): SSLSocket {
         Log.d(TAG, "connect")
         val context = SSLContext.getInstance("TLSv1.2")
         context.init(null, arrayOf(TrustManager()), null)
         val socket = context.socketFactory.createSocket() as SSLSocket
-        socket.soTimeout = 10000
-        socket.connect(InetSocketAddress(uri.host, port), 10000)
+        socket.soTimeout = readTimeout * 1000
+        socket.connect(InetSocketAddress(uri.host, port), connectionTimeout * 1000)
         socket.startHandshake()
         return socket
     }
@@ -69,6 +69,8 @@ class Request(private val uri: Uri) {
     }
 
     companion object {
-        const val TAG = "Request"
+        private const val TAG = "Request"
+        const val DEFAULT_CONNECTION_TIMEOUT_SEC = 10
+        const val DEFAULT_READ_TIMEOUT_SEC = 10
     }
 }

app/src/main/java/dev/lowrespalmtree/comet/SettingsFragment.kt

@@ -0,0 +1,27 @@
+package dev.lowrespalmtree.comet
+
+import android.os.Bundle
+import androidx.lifecycle.lifecycleScope
+import androidx.preference.EditTextPreference
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+
+class SettingsFragment : PreferenceFragmentCompat() {
+    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+        setPreferencesFromResource(R.xml.root_preferences, rootKey)
+        findPreference<Preference>("home_set")?.setOnPreferenceClickListener {
+            lifecycleScope.launch(Dispatchers.IO) {
+                val lastEntry = History.getLast()
+                launch(Dispatchers.Main) {
+                    if (lastEntry != null)
+                        findPreference<EditTextPreference>("home")?.text = lastEntry.uri
+                    else
+                        toast(requireContext(), R.string.no_current_url)
+                }
+            }
+            true
+        }
+    }
+}

app/src/main/java/dev/lowrespalmtree/comet/UiUtils.kt

@@ -0,0 +1,7 @@
+package dev.lowrespalmtree.comet
+
+import android.content.Context
+import android.widget.Toast
+
+fun toast(context: Context, stringId: Int, length: Int = Toast.LENGTH_SHORT) =
+    Toast.makeText(context, stringId, length).show()

app/src/main/res/anim/slide_in_left.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate android:fromXDelta="-50%p" android:toXDelta="0"
+        android:duration="@android:integer/config_mediumAnimTime"/>
+    <alpha android:fromAlpha="0.0" android:toAlpha="1.0"
+        android:duration="@android:integer/config_mediumAnimTime" />
+</set>

app/src/main/res/anim/slide_in_right.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate android:fromXDelta="50%p" android:toXDelta="0"
+        android:duration="@android:integer/config_mediumAnimTime"/>
+    <alpha android:fromAlpha="0.0" android:toAlpha="1.0"
+        android:duration="@android:integer/config_mediumAnimTime" />
+</set>

app/src/main/res/anim/slide_out_left.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate android:fromXDelta="0" android:toXDelta="-50%p"
+        android:duration="@android:integer/config_mediumAnimTime"/>
+    <alpha android:fromAlpha="1.0" android:toAlpha="0.0"
+        android:duration="@android:integer/config_mediumAnimTime" />
+</set>

app/src/main/res/anim/slide_out_right.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate android:fromXDelta="0" android:toXDelta="50%p"
+        android:duration="@android:integer/config_mediumAnimTime"/>
+    <alpha android:fromAlpha="1.0" android:toAlpha="0.0"
+        android:duration="@android:integer/config_mediumAnimTime" />
+</set>

app/src/main/res/layout/activity_main.xml

@@ -1,71 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.drawerlayout.widget.DrawerLayout
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/root"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_height="match_parent"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:fitsSystemWindows="true">
 
-    <com.google.android.material.appbar.AppBarLayout
-        android:id="@+id/app_bar"
-        android:layout_width="match_parent"
-        android:layout_height="56dp">
-
-        <Toolbar
-            android:id="@+id/toolbar"
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/nav_host_fragment"
+        android:name="androidx.navigation.fragment.NavHostFragment"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-            app:contentScrim="?attr/colorPrimary"
-            app:layout_scrollFlags="scroll|enterAlways"
-            app:toolbarId="@+id/toolbar">
+        app:navGraph="@navigation/main"
+        app:defaultNavHost="true" />
 
-            <EditText
-                android:id="@+id/address_bar"
-                android:layout_width="match_parent"
+    <com.google.android.material.navigation.NavigationView
+        android:id="@+id/drawer_navigation"
+        android:layout_width="wrap_content"
         android:layout_height="match_parent"
-                android:layout_margin="4dp"
-                android:hint="@string/url"
-                android:imeOptions="actionDone|actionGo"
-                android:importantForAutofill="no"
-                android:inputType="textUri"
-                android:text=""
-                tools:ignore="TextContrastCheck" />
+        android:layout_gravity="start"
+        android:fitsSystemWindows="true"
+        app:menu="@menu/drawer" />
 
-        </Toolbar>
-
-    </com.google.android.material.appbar.AppBarLayout>
-
-    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
-        android:id="@+id/content_swipe_layout"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        app:layout_behavior="@string/appbar_scrolling_view_behavior">
-
-        <RelativeLayout
-            android:id="@+id/content_inner_layout"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            app:layout_behavior="@string/appbar_scrolling_view_behavior">
-
-            <androidx.recyclerview.widget.RecyclerView
-                android:id="@+id/content_recycler"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                app:layout_constraintTop_toTopOf="parent" />
-
-            <androidx.core.widget.ContentLoadingProgressBar
-                android:id="@+id/content_progress_bar"
-                style="?android:attr/progressBarStyleHorizontal"
-                android:layout_width="match_parent"
-                android:layout_height="16dp"
-                android:layout_alignParentTop="true"
-                android:layout_marginTop="-8dp"
-                android:indeterminate="true"
-                android:visibility="gone" />
-
-        </RelativeLayout>
-
-    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
-
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+</androidx.drawerlayout.widget.DrawerLayout>

app/src/main/res/layout/fragment_page_view.xml

@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout 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/root"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    >
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/app_bar_layout"
+        android:layout_width="match_parent"
+        android:layout_height="56dp">
+
+        <Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            app:contentScrim="?attr/colorPrimary"
+            app:layout_scrollFlags="scroll|enterAlways"
+            app:toolbarId="@+id/toolbar">
+
+            <EditText
+                android:id="@+id/address_bar"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:layout_margin="4dp"
+                android:hint="@string/url"
+                android:imeOptions="actionDone|actionGo"
+                android:importantForAutofill="no"
+                android:inputType="textUri"
+                android:text=""
+                tools:ignore="TextContrastCheck" />
+
+        </Toolbar>
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/content_swipe_layout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+        <RelativeLayout
+            android:id="@+id/content_inner_layout"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/content_recycler"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                app:layout_constraintTop_toTopOf="parent" />
+
+            <androidx.core.widget.ContentLoadingProgressBar
+                android:id="@+id/content_progress_bar"
+                style="?android:attr/progressBarStyleHorizontal"
+                android:layout_width="match_parent"
+                android:layout_height="16dp"
+                android:layout_alignParentTop="true"
+                android:layout_marginTop="-8dp"
+                android:indeterminate="true"
+                android:visibility="gone" />
+
+        </RelativeLayout>
+
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/menu/drawer.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/history"
+        android:icon="@android:drawable/ic_menu_recent_history"
+        android:title="@string/history" />
+    <item
+        android:id="@+id/settingsFragment"
+        android:icon="@android:drawable/ic_menu_preferences"
+        android:title="@string/settings" />
+</menu>

app/src/main/res/menu/menu_scrolling.xml

@@ -1,10 +0,0 @@
-<menu 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"
-    tools:context="dev.lowrespalmtree.comet.ScrollingActivity">
-    <item
-        android:id="@+id/action_settings"
-        android:orderInCategory="100"
-        android:title="@string/action_settings"
-        app:showAsAction="never" />
-</menu>

app/src/main/res/navigation/main.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/main"
+    app:startDestination="@id/pageViewFragment">
+
+    <fragment
+        android:id="@+id/pageViewFragment"
+        android:name="dev.lowrespalmtree.comet.PageViewFragment"
+        android:label="PageViewFragment" />
+    <fragment
+        android:id="@+id/settingsFragment"
+        android:name="dev.lowrespalmtree.comet.SettingsFragment"
+        android:label="SettingsFragment" />
+</navigation>

app/src/main/res/values/arrays.xml

@@ -0,0 +1,12 @@
+<resources>
+    <!-- Reply Preference -->
+    <string-array name="reply_entries">
+        <item>Reply</item>
+        <item>Reply to all</item>
+    </string-array>
+
+    <string-array name="reply_values">
+        <item>reply</item>
+        <item>reply_all</item>
+    </string-array>
+</resources>

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

@@ -1,6 +1,32 @@
 <resources>
     <string name="app_name">Comet</string>
     <string name="error_alert_title">Error</string>
-    <string name="action_settings">Settings</string>
     <string name="url">URL</string>
+    <string name="settings">Settings</string>
+    <string name="history">History</string>
+
+    <!-- Preferences General -->
+    <string name="pref_general_header">General</string>
+    <string name="pref_home_title">Home page</string>
+    <string name="pref_home_set">Set last visited page as home page</string>
+    <string name="no_current_url">No current URL.</string>
+
+
+    <!-- Preference Protocol -->
+    <string name="pref_protocol_header">Protocol</string>
+    <string name="pref_connection_timeout_title">Connection timeout (seconds)</string>
+    <string name="pref_read_timeout_title">Read timeout (seconds)</string>
+
+    <!-- Newly added -->
+
+    <string name="signature_title">Your signature</string>
+    <string name="reply_title">Default reply action</string>
+
+    <string name="sync_title">Sync email periodically</string>
+    <string name="attachment_title">Download incoming attachments</string>
+    <string name="attachment_summary_on">Automatically download attachments for incoming emails
+    </string>
+    <string name="attachment_summary_off">Only download attachments when manually requested</string>
+
+
 </resources>

app/src/main/res/xml/root_preferences.xml

@@ -0,0 +1,56 @@
+<androidx.preference.PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <PreferenceCategory app:title="@string/pref_general_header">
+
+        <EditTextPreference
+            app:key="home"
+            app:title="@string/pref_home_title"
+            app:useSimpleSummaryProvider="true" />
+
+        <Preference
+            app:key="home_set"
+            app:title="@string/pref_home_set" />
+
+        <ListPreference
+            app:defaultValue="reply"
+            app:entries="@array/reply_entries"
+            app:entryValues="@array/reply_values"
+            app:key="reply"
+            app:title="@string/reply_title"
+            app:useSimpleSummaryProvider="true" />
+
+    </PreferenceCategory>
+
+    <PreferenceCategory app:title="@string/pref_protocol_header">
+
+        <SeekBarPreference
+            app:key="connection_timeout"
+            app:title="@string/pref_connection_timeout_title"
+            app:seekBarIncrement="1"
+            app:showSeekBarValue="true"
+            android:max="60"
+            android:defaultValue="10" />
+
+        <SeekBarPreference
+            app:key="read_timeout"
+            app:title="@string/pref_read_timeout_title"
+            app:seekBarIncrement="1"
+            app:showSeekBarValue="true"
+            android:max="60"
+            android:defaultValue="10" />
+
+        <SwitchPreferenceCompat
+            app:key="sync"
+            app:title="@string/sync_title" />
+
+        <SwitchPreferenceCompat
+            app:dependency="sync"
+            app:key="attachment"
+            app:summaryOff="@string/attachment_summary_off"
+            app:summaryOn="@string/attachment_summary_on"
+            app:title="@string/attachment_title" />
+
+    </PreferenceCategory>
+
+</androidx.preference.PreferenceScreen>

build.gradle

@@ -1,4 +1,5 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
+
 buildscript {
     repositories {
         google()
@@ -6,10 +7,8 @@ buildscript {
     }
     dependencies {
         classpath "com.android.tools.build:gradle:7.0.4"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.0"
-
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.10'
+        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.3.5"
     }
 }