Adjusted the size of the hamburger icon. * To address unexpected behavior, where setting the icon directly to the hamburger resulted in it taking the full width and height of the toolbar, we resized the app icon and applied it to the hamburger icon.

core/src/main/java/org/kiwix/kiwixmobile/core/extensions/ContextExtensions.kt

@@ -21,9 +21,14 @@ package org.kiwix.kiwixmobile.core.extensions
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.graphics.drawable.BitmapDrawable
+import android.graphics.drawable.Drawable
 import android.util.TypedValue
 import android.widget.Toast
 import androidx.annotation.AttrRes
+import androidx.core.content.ContextCompat
 import org.kiwix.kiwixmobile.core.base.BaseBroadcastReceiver
 import java.util.Locale
 
@@ -59,3 +64,40 @@ fun Context.getAttribute(@AttrRes attributeRes: Int) = with(TypedValue()) {
   else
     throw RuntimeException("invalid attribute $attributeRes")
 }
+
+fun Context.getResizedDrawable(resourceId: Int, width: Int, height: Int): Drawable? {
+  val drawable = ContextCompat.getDrawable(this, resourceId)
+
+  return if (drawable != null) {
+    val bitmap = Bitmap.createScaledBitmap(
+      getBitmapFromDrawable(drawable),
+      width,
+      height,
+      false
+    )
+
+    BitmapDrawable(resources, bitmap).apply {
+      bounds = drawable.bounds
+    }
+  } else {
+    null
+  }
+}
+
+fun Context.getBitmapFromDrawable(drawable: Drawable): Bitmap {
+  if (drawable is BitmapDrawable) {
+    return drawable.bitmap
+  }
+
+  val bitmap = Bitmap.createBitmap(
+    drawable.intrinsicWidth,
+    drawable.intrinsicHeight,
+    Bitmap.Config.ARGB_8888
+  )
+  val canvas = Canvas(bitmap)
+  drawable.setBounds(0, 0, canvas.width, canvas.height)
+  drawable.draw(canvas)
+
+  return bitmap
+}
+

core/src/main/res/values/dimens.xml

@@ -20,4 +20,5 @@
   <dimen name="fab_vertical_offset">25dp</dimen>
 
   <dimen name="material_design_appbar_size">48dp</dimen>
+  <dimen name="hamburger_icon_size">36dp</dimen>
 </resources>

custom/src/main/java/org/kiwix/kiwixmobile/custom/main/CustomReaderFragment.kt

@@ -29,6 +29,7 @@ import androidx.drawerlayout.widget.DrawerLayout
 import androidx.navigation.fragment.findNavController
 import org.kiwix.kiwixmobile.core.base.BaseActivity
 import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.setupDrawerToggle
+import org.kiwix.kiwixmobile.core.extensions.getResizedDrawable
 import org.kiwix.kiwixmobile.core.extensions.isFileExist
 import org.kiwix.kiwixmobile.core.main.CoreReaderFragment
 import org.kiwix.kiwixmobile.core.main.MainMenu
@@ -57,6 +58,7 @@ class CustomReaderFragment : CoreReaderFragment() {
   var dialogShower: DialogShower? = null
   private var permissionRequiredDialog: Dialog? = null
   private var appSettingsLaunched = false
+
   @Suppress("NestedBlockDepth")
   override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
     super.onViewCreated(view, savedInstanceState)
@@ -77,7 +79,11 @@ class CustomReaderFragment : CoreReaderFragment() {
           if (BuildConfig.DISABLE_TITLE) {
             // if the title is disable then set the app logo to hamburger icon,
             // see https://github.com/kiwix/kiwix-android/issues/3528#issuecomment-1814905330
-            it.setNavigationIcon(R.mipmap.ic_launcher)
+            val iconSize =
+              resources.getDimensionPixelSize(org.kiwix.kiwixmobile.core.R.dimen.hamburger_icon_size)
+            getResizedDrawable(R.mipmap.ic_launcher, iconSize, iconSize)?.let { drawable ->
+              it.navigationIcon = drawable
+            }
           }
         }
       }