Add toolbar support

app/src/main/java/com/osfans/trime/settings/PrefMainActivity.kt

@@ -2,8 +2,13 @@ package com.osfans.trime.settings
 
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.Toolbar
+import androidx.fragment.app.Fragment
+import com.osfans.trime.R
 import com.osfans.trime.databinding.PrefActivityBinding
 
+internal const val FRAGMENT_TAG = "FRAGMENT_TAG"
+
 class PrefMainActivity: AppCompatActivity() {
 
     lateinit var binding: PrefActivityBinding
@@ -12,5 +17,15 @@ class PrefMainActivity: AppCompatActivity() {
         super.onCreate(savedInstanceState)
         binding = PrefActivityBinding.inflate(layoutInflater)
         setContentView(binding.root)
+
+        val toolbar = findViewById<Toolbar>(R.id.toolbar)
+        setSupportActionBar(toolbar)
+    }
+
+    private fun loadFragment(fragment: Fragment) {
+        supportFragmentManager
+            .beginTransaction()
+            .replace(binding.preference.id, fragment, FRAGMENT_TAG)
+            .commit()
     }
 }

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

@@ -4,6 +4,8 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <include layout="@layout/toolbar" />
+
     <FrameLayout
         android:id="@+id/preference"
         android:layout_width="match_parent"

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

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.appcompat.widget.Toolbar
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/toolbar"
+    android:layout_width="match_parent"
+    android:layout_height="?attr/actionBarSize"
+    android:background="@color/colorPrimary"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+    app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />