Implement collapsing toolbar

app/src/main/AndroidManifest.xml

@@ -181,18 +181,13 @@
         <activity
             android:name=".ui.MainSettingsActivity"
             android:theme="@style/PreferenceTheme"
-            android:icon="@drawable/ic_notification"
+            android:process=":ui"/>
-            android:label="@string/app_name"
-            android:process=":ui"
-            android:roundIcon="@drawable/ic_notification"/>
 
         <activity-alias
             android:name=".ui.SettingsActivityLink"
             android:exported="true"
-            android:icon="@drawable/ic_notification"
             android:label="@string/eos_settings_title"
             android:process=":ui"
-            android:roundIcon="@drawable/ic_notification"
             android:targetActivity=".ui.MainSettingsActivity">
             <intent-filter>
                 <action android:name="com.android.settings.action.EXTRA_SETTINGS" />

app/src/main/java/io/heckel/ntfy/ui/MainSettingsActivity.kt

@@ -16,6 +16,10 @@ class MainSettingsActivity: AppCompatActivity() {
         mBinding = MainSettingsActivityBinding.inflate(layoutInflater)
         setContentView(mBinding.root)
 
+        mBinding.toolbar.setNavigationOnClickListener {
+            onBackPressed()
+        }
+
         supportFragmentManager
             .beginTransaction()
             .replace(R.id.fragment_container, PreferencesFragment())

app/src/main/java/io/heckel/ntfy/ui/PreferencesFragment.kt

@@ -1,11 +1,17 @@
 package io.heckel.ntfy.ui
 
+import android.content.Context
 import android.content.Intent
 import android.os.Bundle
+import android.view.Menu
+import android.view.MenuInflater
+import android.view.MenuItem
+import android.widget.Toolbar
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.SwitchPreferenceCompat
 import io.heckel.ntfy.R
 import io.heckel.ntfy.service.SubscriberService
+import io.heckel.ntfy.util.Log
 
 class PreferencesFragment : PreferenceFragmentCompat() {
 

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

@@ -1,11 +1,49 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:orientation="vertical"
+    android:fitsSystemWindows="true"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <com.google.android.material.appbar.AppBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:fitsSystemWindows="true">
+
+        <com.google.android.material.appbar.CollapsingToolbarLayout
+            android:id="@+id/collapsing_toolbar"
+            style="?attr/collapsingToolbarLayoutLargeStyle"
+            android:background="@color/e_background"
+            android:layout_width="match_parent"
+            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
+            android:layout_height="?attr/collapsingToolbarLayoutLargeSize">
+
+            <com.google.android.material.appbar.MaterialToolbar
+                app:navigationIcon="@drawable/e_ic_back"
+                app:title="@string/eos_settings_title"
+                android:id="@+id/toolbar"
+                android:background="@color/e_background"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                app:layout_collapseMode="pin" />
+
+        </com.google.android.material.appbar.CollapsingToolbarLayout>
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <androidx.core.widget.NestedScrollView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:fillViewport="true"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
         <FrameLayout
             android:id="@+id/fragment_container"
             android:layout_width="match_parent"
             android:layout_height="match_parent"/>
 
+    </androidx.core.widget.NestedScrollView>
+
 </LinearLayout>

app/src/main/res/xml/settings_preferences.xml

@@ -2,6 +2,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
     <SwitchPreferenceCompat
+        app:icon="@drawable/ic_notification"
         app:key="isEnabled"
         app:defaultValue="false"
         app:title="@string/eos_settings_enable_title"