Set FLAG_SECURE, Add biometric lock setting

app/src/main/java/com/cringe_studios/cringe_authenticator/MainActivity.java

@@ -1,10 +1,14 @@
 package com.cringe_studios.cringe_authenticator;
 
+import static androidx.biometric.BiometricManager.Authenticators.BIOMETRIC_STRONG;
+import static androidx.biometric.BiometricManager.Authenticators.DEVICE_CREDENTIAL;
+
 import android.os.Bundle;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.WindowManager;
 import android.widget.AdapterView;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
@@ -46,6 +50,8 @@ public class MainActivity extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+
         Integer themeID = SettingsUtil.THEMES.get(SettingsUtil.getTheme(this));
         if(themeID != null) {
             setTheme(themeID);
@@ -66,15 +72,17 @@ public class MainActivity extends AppCompatActivity {
             }
         });
 
-        /*BiometricPrompt.PromptInfo info = new BiometricPrompt.PromptInfo.Builder()
+        if(SettingsUtil.isBiometricLock(this)) {
-                .setTitle("Biometric login for my app")
+            BiometricPrompt.PromptInfo info = new BiometricPrompt.PromptInfo.Builder()
-                .setSubtitle("Log in using your biometric credential")
+                    .setTitle("Cringe Authenticator")
-                .setAllowedAuthenticators(BIOMETRIC_STRONG | DEVICE_CREDENTIAL)
+                    .setSubtitle("Unlock the authenticator")
-                .build();
+                    .setAllowedAuthenticators(BIOMETRIC_STRONG | DEVICE_CREDENTIAL)
+                    .build();
 
-        prompt.authenticate(info);*/
+            prompt.authenticate(info);
-
+        }else {
-        launchApp();
+            launchApp();
+        }
 
         startQRCodeScan = registerForActivityResult(new QRScannerContract(), obj -> {
             if(obj == null) return; // Cancelled

app/src/main/java/com/cringe_studios/cringe_authenticator/fragment/SettingsFragment.java

@@ -31,6 +31,9 @@ public class SettingsFragment extends NamedFragment {
         binding.settingsEnableIntroVideo.setChecked(SettingsUtil.isIntroVideoEnabled(requireContext()));
         binding.settingsEnableIntroVideo.setOnCheckedChangeListener((view, checked) -> SettingsUtil.setEnableIntroVideo(requireContext(), checked));
 
+        binding.settingsBiometricLock.setChecked(SettingsUtil.isBiometricLock(requireContext()));
+        binding.settingsBiometricLock.setOnCheckedChangeListener((view, checked) -> SettingsUtil.setBiometricLock(requireContext(), checked));
+
         binding.settingsTheme.setAdapter(new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, SettingsUtil.THEME_NAMES.toArray(new String[0])));
         binding.settingsTheme.setSelection(SettingsUtil.THEME_NAMES.indexOf(SettingsUtil.getTheme(requireContext())));
         binding.settingsTheme.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

app/src/main/java/com/cringe_studios/cringe_authenticator/grouplist/GroupListAdapter.java

@@ -61,7 +61,6 @@ public class GroupListAdapter extends RecyclerView.Adapter<GroupListItem> {
                     .setNegativeButton("No", (dialog, which) -> {})
                     .show();
             // TODO: better method?
-            // TODO: actually delete
             return true;
         });
     }

app/src/main/java/com/cringe_studios/cringe_authenticator/scanner/QRScannerActivity.java

@@ -9,6 +9,7 @@ import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.view.MotionEvent;
+import android.view.WindowManager;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -51,6 +52,8 @@ public class QRScannerActivity extends AppCompatActivity {
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
             requestPermissions(new String[] {Manifest.permission.CAMERA}, 1234);
         }

app/src/main/java/com/cringe_studios/cringe_authenticator/util/SettingsUtil.java

@@ -91,6 +91,15 @@ public class SettingsUtil {
         return ctx.getSharedPreferences(GENERAL_PREFS_NAME, Context.MODE_PRIVATE).getBoolean("enableIntroVideo", true);
     }
 
+    public static void setBiometricLock(Context ctx, boolean biometricLock) {
+        SharedPreferences prefs = ctx.getSharedPreferences(GENERAL_PREFS_NAME, Context.MODE_PRIVATE);
+        prefs.edit().putBoolean("biometricLock", biometricLock).apply();
+    }
+
+    public static boolean isBiometricLock(Context ctx) {
+        return ctx.getSharedPreferences(GENERAL_PREFS_NAME, Context.MODE_PRIVATE).getBoolean("biometricLock", true);
+    }
+
     public static void setTheme(Context ctx, String theme) {
         SharedPreferences prefs = ctx.getSharedPreferences(GENERAL_PREFS_NAME, Context.MODE_PRIVATE);
         prefs.edit().putString("theme", theme).apply();

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -18,6 +17,12 @@
             android:layout_height="wrap_content"
             android:text="Enable intro video" />
 
+        <androidx.appcompat.widget.SwitchCompat
+            android:id="@+id/settings_biometric_lock"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="Require biometric unlock" />
+
         <Spinner
             android:id="@+id/settings_theme"
             android:layout_width="match_parent"