Add hamburger menu to the shelf that opens the About screen

app/src/main/AndroidManifest.xml

@@ -40,6 +40,10 @@
             android:name=".BookActivity"
             android:exported="false"
             android:label="@string/title_book" />
-    </application>
+            <activity
+            android:name=".AboutActivity"
+            android:exported="false"
+            android:theme="@style/Theme.PageScribe" />
+</application>
 
 </manifest>

app/src/main/java/com/bm/pagescribe/AboutActivity.kt

@@ -0,0 +1,37 @@
+package com.bm.pagescribe
+
+import android.os.Bundle
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.Toolbar
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+
+/** Shows the app icon, name and version. Reached from the shelf's hamburger. */
+class AboutActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_about)
+
+        // The app theme is NoActionBar, so each screen draws its own toolbar.
+        val toolbar = findViewById<Toolbar>(R.id.toolbar)
+        setSupportActionBar(toolbar)
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        toolbar.setNavigationOnClickListener { finish() }
+
+        findViewById<TextView>(R.id.versionText).text =
+            "Version " + BuildInfo.versionName(this)
+
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
+            val bars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(bars.left, bars.top, bars.right, bars.bottom)
+            insets
+        }
+    }
+
+    override fun onSupportNavigateUp(): Boolean {
+        finish()
+        return true
+    }
+}

app/src/main/java/com/bm/pagescribe/BuildInfo.kt

@@ -0,0 +1,13 @@
+package com.bm.pagescribe
+
+import android.content.Context
+
+/** Version string for the About screen, kept in one place. */
+object BuildInfo {
+    fun versionName(context: Context): String = try {
+        @Suppress("DEPRECATION")
+        context.packageManager.getPackageInfo(context.packageName, 0).versionName ?: "unknown"
+    } catch (e: Exception) {
+        "unknown"
+    }
+}

app/src/main/java/com/bm/pagescribe/MainActivity.kt

@@ -57,9 +57,13 @@ class MainActivity : AppCompatActivity() {
         enableEdgeToEdge(statusBarStyle = SystemBarStyle.dark(Color.TRANSPARENT))
         setContentView(R.layout.activity_main)
 
-        setSupportActionBar(findViewById<MaterialToolbar>(R.id.toolbar))
+        val toolbar = findViewById<MaterialToolbar>(R.id.toolbar)
+        setSupportActionBar(toolbar)
         EdgeToEdge.padTop(findViewById(R.id.appBar))
         EdgeToEdge.padBottom(findViewById(R.id.contentRoot))
+        // Hamburger menu → About. Single destination, so no drawer needed.
+        toolbar.setNavigationIcon(R.drawable.ic_hamburger)
+        toolbar.setNavigationOnClickListener { showAbout() }
 
         repository = BookRepository(this)
         statusText = findViewById(R.id.ocrStatus)
@@ -158,6 +162,9 @@ class MainActivity : AppCompatActivity() {
     private companion object {
         const val POLL_INTERVAL = 1500L
     }
+    private fun showAbout() {
+        startActivity(android.content.Intent(this, AboutActivity::class.java))
+    }
 }
 
 /** Row of the book list. */
@@ -197,3 +204,4 @@ private class BookAdapter(
         holder.itemView.setOnClickListener { onClick(book) }
     }
 }
+

app/src/main/res/drawable/ic_hamburger.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Three bars, the conventional "menu" affordance. White so it reads on the
+     brand-blue toolbar; drawn on a 24dp grid to match the other action icons. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="@android:color/white">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M3,6h18v2h-18z" />
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M3,11h18v2h-18z" />
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M3,16h18v2h-18z" />
+</vector>

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

@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:background="@color/paper">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="@color/primary"
+        android:elevation="4dp">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:background="@color/primary"
+            app:title="About"
+            app:titleTextColor="@android:color/white"
+            app:navigationIconTint="@android:color/white" />
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:fillViewport="true">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:padding="32dp"
+            android:gravity="center_horizontal">
+
+            <ImageView
+                android:layout_width="120dp"
+                android:layout_height="120dp"
+                android:layout_marginTop="32dp"
+                android:src="@mipmap/ic_launcher"
+                android:contentDescription="@string/app_name" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="24dp"
+                android:text="@string/app_name"
+                android:textSize="24sp"
+                android:textStyle="bold"
+                android:textColor="@color/ink" />
+
+            <TextView
+                android:id="@+id/versionText"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="8dp"
+                android:text="Version"
+                android:textSize="14sp"
+                android:textColor="@color/ink_muted" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="32dp"
+                android:gravity="center"
+                android:text="@string/about_blurb"
+                android:textSize="14sp"
+                android:textColor="@color/ink_muted" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="32dp"
+                android:text="@string/about_copyright"
+                android:textSize="14sp"
+                android:textColor="@color/ink_muted" />
+
+        </LinearLayout>
+    </ScrollView>
+</LinearLayout>

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

@@ -59,4 +59,7 @@
     <string name="notif_running">Reading pages of %1$s</string>
     <string name="notif_done">Finished: %1$s</string>
     <string name="notif_failed">OCR failed for %1$s</string>
+    <string name="about_title">About</string>
+    <string name="about_copyright">© 2026 UmbraTools</string>
+    <string name="about_blurb">Photographs two-page spreads, reads the printed page numbers, and assembles each book into a single ordered text file.</string>
 </resources>