Make preferences look decent (material) on KitKat

I have no idea what I'm doing

app/build.gradle

@@ -32,6 +32,7 @@ dependencies {
     implementation 'com.android.support:recyclerview-v7:27.1.1'
     implementation 'com.android.support:appcompat-v7:27.1.1'
     implementation 'com.android.support:design:27.1.1'
+    implementation 'com.takisoft.fix:preference-v7:27.1.1.1'
     implementation 'com.amulyakhare:com.amulyakhare.textdrawable:1.0.1'
     implementation 'me.dm7.barcodescanner:zxing:1.9'
     implementation 'com.android.support:cardview-v7:27.1.1'

app/src/main/java/me/impy/aegis/ui/PreferencesActivity.java

@@ -16,7 +16,7 @@ public class PreferencesActivity extends AegisActivity implements PasswordDialog
 
         _fragment = new PreferencesFragment();
         _fragment.setArguments(getIntent().getExtras());
-        getFragmentManager().beginTransaction().replace(android.R.id.content, _fragment).commit();
+        getSupportFragmentManager().beginTransaction().replace(android.R.id.content, _fragment).commit();
     }
 
     @Override

app/src/main/java/me/impy/aegis/ui/PreferencesFragment.java

@@ -7,11 +7,11 @@ import android.content.Intent;
 import android.media.MediaScannerConnection;
 import android.net.Uri;
 import android.os.Bundle;
-import android.preference.EditTextPreference;
-import android.preference.Preference;
-import android.preference.PreferenceFragment;
+import android.support.v7.preference.EditTextPreference;
 import android.support.v7.app.AlertDialog;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.preference.Preference;
+import com.takisoft.fix.support.v7.preference.PreferenceFragmentCompat;
 import android.view.Window;
 import android.view.WindowManager;
 import android.widget.Toast;
@@ -42,7 +42,7 @@ import me.impy.aegis.ui.dialogs.PasswordDialogFragment;
 import me.impy.aegis.ui.preferences.SwitchPreference;
 import me.impy.aegis.util.ByteInputStream;
 
-public class PreferencesFragment extends PreferenceFragment implements PasswordDialogFragment.Listener {
+public class PreferencesFragment extends PreferenceFragmentCompat implements PasswordDialogFragment.Listener {
     // activity request codes
     private static final int CODE_IMPORT = 0;
     private static final int CODE_IMPORT_DECRYPT = 1;
@@ -64,8 +64,7 @@ public class PreferencesFragment extends PreferenceFragment implements PasswordD
     private Preference _slotsPreference;
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
+    public void onCreatePreferencesFix(Bundle savedInstanceState, String rootKey) {
         addPreferencesFromResource(R.xml.preferences);
 
         AegisApplication app = (AegisApplication) getActivity().getApplication();

app/src/main/java/me/impy/aegis/ui/preferences/SwitchPreference.java

@@ -3,10 +3,12 @@ package me.impy.aegis.ui.preferences;
 import android.content.Context;
 import android.os.Build;
 import android.support.annotation.RequiresApi;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.SwitchPreferenceCompat;
 import android.util.AttributeSet;
 
-public class SwitchPreference extends android.preference.SwitchPreference {
-    private OnPreferenceChangeListener _listener;
+public class SwitchPreference extends SwitchPreferenceCompat {
+    private Preference.OnPreferenceChangeListener _listener;
 
     @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
     public SwitchPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {

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

@@ -16,7 +16,7 @@
     <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar"/>
     <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light"/>
 
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+    <style name="AppTheme" parent="PreferenceFixTheme.Light.DarkActionBar">
         <item name="primaryText">@color/primary_text</item>
         <item name="secondaryText">@color/secondary_text</item>
         <item name="cardBackground">@color/card_background</item>
@@ -25,6 +25,7 @@
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
         <item name="background">@color/background</item>
+        <item name="preferenceCategory_marginBottom">0dp</item>
 
         <item name="swirl_ridgeColor">@color/colorSwirlPrimary</item>
         <item name="swirl_errorColor">@color/colorSwirlError</item>
@@ -45,7 +46,7 @@
         <item name="android:windowFullscreen">true</item>
     </style>
 
-    <style name="AppTheme.Dark" parent="Theme.AppCompat">
+    <style name="AppTheme.Dark" parent="@style/PreferenceFixTheme">
         <item name="primaryText">@color/primary_text_dark</item>
         <item name="secondaryText">@color/secondary_text_dark</item>
         <item name="cardBackground">@color/card_background_dark</item>
@@ -54,6 +55,7 @@
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
         <item name="background">@color/background_dark</item>
+        <item name="preferenceCategory_marginBottom">0dp</item>
 
         <item name="swirl_ridgeColor">@color/colorSwirlPrimaryDark</item>
         <item name="swirl_errorColor">@color/colorSwirlErrorDark</item>

app/src/main/res/xml/preferences.xml

@@ -1,16 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+<android.support.v7.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
                   android:title="@string/settings">
 
     <PreferenceCategory
         android:title="Appearance">
-        <SwitchPreference
+        <android.support.v7.preference.SwitchPreferenceCompat
             android:defaultValue="false"
             android:key="pref_dark_mode"
             android:title="@string/pref_dark_mode_title"
             android:summary="@string/pref_dark_mode_summary"/>
 
-        <SwitchPreference
+        <android.support.v7.preference.SwitchPreferenceCompat
             android:defaultValue="false"
             android:key="pref_issuer"
             android:title="@string/pref_issuer_title"
@@ -19,7 +19,7 @@
 
     <PreferenceCategory
         android:title="Security">
-        <SwitchPreference
+        <android.support.v7.preference.SwitchPreferenceCompat
             android:defaultValue="true"
             android:key="pref_secure_screen"
             android:title="@string/pref_secure_screen_title"
@@ -54,4 +54,4 @@
             android:summary="@string/pref_export_summary"/>
     </PreferenceCategory>
 
-</PreferenceScreen>
+</android.support.v7.preference.PreferenceScreen>