add about to app

android/app/src/main/java/com/izzy2lost/super3/MainActivity.kt

@@ -3,6 +3,8 @@ package com.izzy2lost.super3
 import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
+import android.text.method.LinkMovementMethod
+import android.text.util.Linkify
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -40,6 +42,7 @@ class MainActivity : AppCompatActivity() {
     private lateinit var searchBar: SearchBar
     private lateinit var searchView: SearchView
     private lateinit var btnViewMode: ImageButton
+    private lateinit var btnAbout: MaterialButton
 
     private lateinit var gamesFolderText: TextView
     private lateinit var userFolderText: TextView
@@ -130,6 +133,7 @@ class MainActivity : AppCompatActivity() {
 
         // Get views from the navigation header
         val headerView = navigationView.getHeaderView(0)
+        btnAbout = headerView.findViewById(R.id.btn_about)
         gamesFolderText = headerView.findViewById(R.id.games_folder_text)
         userFolderText = headerView.findViewById(R.id.user_folder_text)
         statusText = headerView.findViewById(R.id.status_text)
@@ -159,6 +163,11 @@ class MainActivity : AppCompatActivity() {
             drawerLayout.openDrawer(GravityCompat.START)
         }
 
+        btnAbout.setOnClickListener {
+            drawerLayout.closeDrawer(GravityCompat.START)
+            showAboutDialog()
+        }
+
         btnPickGamesFolder.setOnClickListener { pickGamesFolder.launch(null) }
         btnPickUserFolder.setOnClickListener { pickUserFolder.launch(null) }
         btnRescan.setOnClickListener { refreshUi() }
@@ -233,6 +242,38 @@ class MainActivity : AppCompatActivity() {
         refreshUi()
     }
 
+    private fun showAboutDialog() {
+        val view = layoutInflater.inflate(R.layout.dialog_about, null)
+        val aboutText: TextView = view.findViewById(R.id.about_text)
+        aboutText.text =
+            """
+            SUPER3 is an open-source Sega Model 3 emulator for Android.
+
+            Sources used:
+            https://github.com/trzy/Supermodel
+            https://github.com/DirtBagXon/model3emu-code-sinden/tree/arm
+
+            License (GPLv3):
+            https://www.gnu.org/licenses/gpl-3.0.en.html
+
+            App source code:
+            https://github.com/izzy2lost/Super3
+
+            Disclaimers:
+            - No games/ROMs/BIOS included.
+            - Not affiliated with or endorsed by SEGA.
+            """.trimIndent()
+
+        Linkify.addLinks(aboutText, Linkify.WEB_URLS)
+        aboutText.movementMethod = LinkMovementMethod.getInstance()
+
+        MaterialAlertDialogBuilder(this)
+            .setTitle(R.string.about_title)
+            .setView(view)
+            .setPositiveButton(android.R.string.ok, null)
+            .show()
+    }
+
     override fun onResume() {
         super.onResume()
         applyImmersiveMode()

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

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+  android:layout_width="match_parent"
+  android:layout_height="wrap_content">
+
+  <LinearLayout
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="20dp">
+
+    <com.google.android.material.textview.MaterialTextView
+      android:id="@+id/about_text"
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:autoLink="web"
+      android:linksClickable="true"
+      android:lineSpacingExtra="2dp"
+      android:textAppearance="?attr/textAppearanceBodyMedium"
+      android:textColor="?attr/colorOnSurface"
+      android:textIsSelectable="true" />
+
+  </LinearLayout>
+</ScrollView>
+

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

@@ -157,5 +157,13 @@
       android:textColor="?attr/colorOnPrimary"
       android:visibility="gone" />
 
+    <com.google.android.material.button.MaterialButton
+      android:id="@+id/btn_about"
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:layout_marginTop="24dp"
+      android:text="@string/about"
+      style="?attr/materialButtonElevatedStyle" />
+
   </LinearLayout>
 </ScrollView>

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

@@ -1,5 +1,7 @@
 <resources>
   <string name="app_name">SUPER3</string>
+  <string name="about">About</string>
+  <string name="about_title">About SUPER3</string>
   <string name="game_menu_save_state">Save state</string>
   <string name="game_menu_exit_game">Exit game</string>
   <string name="save_state_dialog_title">Save states</string>