improve addon activities

app/android/app/src/main/AndroidManifest.xml

@@ -205,6 +205,12 @@
             android:exported="false"
             android:theme="@style/AppTheme" />
 
+        <activity
+            android:name="eu.weblibre.flutter_mozilla_components.addons.AddonInternalSettingsActivity"
+            android:label="@string/mozac_feature_addons_addons"
+            android:exported="false"
+            android:theme="@style/AppTheme" />
+
         <activity
             android:name="eu.weblibre.flutter_mozilla_components.addons.WebExtensionActionPopupActivity"
             android:label="@string/mozac_feature_addons_addons"

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/addons/AddonInternalSettingsActivity.kt

@@ -0,0 +1,105 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package eu.weblibre.flutter_mozilla_components.addons
+
+import android.content.Context
+import android.os.Bundle
+import android.util.AttributeSet
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.activity.OnBackPressedCallback
+import androidx.appcompat.app.AppCompatActivity
+import eu.weblibre.flutter_mozilla_components.GlobalComponents
+import eu.weblibre.flutter_mozilla_components.R
+import mozilla.components.concept.engine.EngineView
+import mozilla.components.feature.addons.Addon
+import mozilla.components.feature.addons.ui.translateName
+import mozilla.components.support.utils.ext.getParcelableCompat
+
+/**
+ * An activity to show the internal settings of an add-on with [EngineView].
+ *
+ * Used when the addon's manifest specifies `openOptionsPageInTab = false`,
+ * rendering the settings page inside an [AddonPopupBaseFragment] with proper
+ * prompt and download support.
+ */
+class AddonInternalSettingsActivity : AppCompatActivity() {
+    private val components by lazy {
+        requireNotNull(GlobalComponents.components) { "Components not initialized" }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_add_on_settings)
+
+        val addon = requireNotNull(
+            intent.getParcelableExtra<Addon>("add_on"),
+        )
+
+        title = addon.translateName(this)
+
+        val fragment = AddonInternalSettingsFragment.create(addon)
+
+        supportFragmentManager
+            .beginTransaction()
+            .replace(R.id.addonSettingsContainer, fragment)
+            .commit()
+
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (!fragment.onBackPressed()) {
+                    finish()
+                }
+            }
+        })
+    }
+
+    override fun onCreateView(parent: View?, name: String, context: Context, attrs: AttributeSet): View? =
+        when (name) {
+            EngineView::class.java.name -> components.core.engine.createView(context, attrs).asView()
+            else -> super.onCreateView(parent, name, context, attrs)
+        }
+
+    /**
+     * A fragment to show the internal settings of an add-on with [EngineView].
+     *
+     * Creates a fresh engine session and loads the addon's options page URL into it.
+     */
+    class AddonInternalSettingsFragment : AddonPopupBaseFragment() {
+
+        private val addonSettingsEngineView: EngineView
+            get() = requireView().findViewById<View>(R.id.addonSettingsEngineView) as EngineView
+
+        override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+            initializeSession()
+            return inflater.inflate(R.layout.fragment_add_on_settings, container, false)
+        }
+
+        override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+            super.onViewCreated(view, savedInstanceState)
+
+            val optionsPageUrl = arguments?.getParcelableCompat("add_on", Addon::class.java)
+                ?.installedState?.optionsPageUrl
+
+            if (optionsPageUrl != null) {
+                engineSession?.let { session ->
+                    addonSettingsEngineView.render(session)
+                    session.loadUrl(optionsPageUrl)
+                }
+            } else {
+                activity?.finish()
+            }
+        }
+
+        companion object {
+            fun create(addon: Addon) = AddonInternalSettingsFragment().apply {
+                arguments = Bundle().apply {
+                    putParcelable("add_on", addon)
+                }
+            }
+        }
+    }
+}

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/addons/InstalledAddonDetailsActivity.kt

@@ -137,10 +137,21 @@ class InstalledAddonDetailsActivity : AppCompatActivity() {
         view.isEnabled = shouldSettingsBeVisible(addon)
         view.setOnClickListener {
             val optionsPageUrl = addon.installedState?.optionsPageUrl ?: return@setOnClickListener
-            components.useCases.tabsUseCases.addTab(optionsPageUrl, selectTab = true)
+            if (addon.installedState?.openOptionsPageInTab == true) {
+                // Open settings in a browser tab, reusing an existing tab if already open.
+                components.useCases.tabsUseCases.selectOrAddTab(
+                    url = optionsPageUrl,
+                    ignoreFragment = true,
+                )
                 val intent = packageManager.getLaunchIntentForPackage(packageName)
                 intent?.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_SINGLE_TOP)
                 startActivity(intent)
+            } else {
+                // Open settings in an internal view with proper extension API support.
+                val intent = Intent(this, AddonInternalSettingsActivity::class.java)
+                intent.putExtra("add_on", addon)
+                startActivity(intent)
+            }
         }
     }
 

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/addons/WebExtensionActionPopupActivity.kt

@@ -10,6 +10,7 @@ import android.util.AttributeSet
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.app.AppCompatActivity
 import eu.weblibre.flutter_mozilla_components.GlobalComponents
 import eu.weblibre.flutter_mozilla_components.R
@@ -37,10 +38,20 @@ class WebExtensionActionPopupActivity : AppCompatActivity() {
             title = it
         }
 
+        val fragment = WebExtensionActionPopupFragment.create(webExtensionId)
+
         supportFragmentManager
             .beginTransaction()
-            .replace(R.id.addonSettingsContainer, WebExtensionActionPopupFragment.create(webExtensionId))
+            .replace(R.id.addonSettingsContainer, fragment)
             .commit()
+
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (!fragment.onBackPressed()) {
+                    finishAndRemoveTask()
+                }
+            }
+        })
     }
 
     override fun onCreateView(parent: View?, name: String, context: Context, attrs: AttributeSet): View? =

packages/flutter_mozilla_components/example/android/app/src/main/AndroidManifest.xml

@@ -91,6 +91,12 @@
             android:exported="false"
             android:theme="@style/Theme.AppCompat.Light" />
 
+        <activity
+            android:name="eu.weblibre.flutter_mozilla_components.addons.AddonInternalSettingsActivity"
+            android:label="@string/mozac_feature_addons_addons"
+            android:exported="false"
+            android:theme="@style/Theme.AppCompat.Light" />
+
         <activity
             android:name="eu.weblibre.flutter_mozilla_components.addons.WebExtensionActionPopupActivity"
             android:label="@string/mozac_feature_addons_addons"