Add security option to disallow screenshots

app/src/main/java/com/philkes/notallyx/NotallyXApplication.kt

@@ -1,15 +1,18 @@
 package com.philkes.notallyx
 
+import android.app.Activity
 import android.app.Application
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.os.Build
+import android.os.Bundle
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.lifecycle.Observer
 import androidx.work.WorkInfo
 import androidx.work.WorkManager
 import com.google.android.material.color.DynamicColors
+import com.philkes.notallyx.presentation.setEnabledSecureFlag
 import com.philkes.notallyx.presentation.view.misc.NotNullLiveData
 import com.philkes.notallyx.presentation.viewmodel.preference.BiometricLock
 import com.philkes.notallyx.presentation.viewmodel.preference.NotallyXPreferences
@@ -33,7 +36,7 @@ import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
-class NotallyXApplication : Application() {
+class NotallyXApplication : Application(), Application.ActivityLifecycleCallbacks {
 
     private lateinit var biometricLockObserver: Observer<BiometricLock>
     private lateinit var preferences: NotallyXPreferences
@@ -43,6 +46,7 @@ class NotallyXApplication : Application() {
 
     override fun onCreate() {
         super.onCreate()
+        registerActivityLifecycleCallbacks(this)
         if (isTestRunner()) return
         preferences = NotallyXPreferences.getInstance(this)
         if (preferences.useDynamicColors.value) {
@@ -168,4 +172,20 @@ class NotallyXApplication : Application() {
             return Build.FINGERPRINT.equals("robolectric", ignoreCase = true)
         }
     }
+
+    override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
+        activity.setEnabledSecureFlag(preferences.secureFlag.value)
+    }
+
+    override fun onActivityStarted(activity: Activity) {}
+
+    override fun onActivityResumed(activity: Activity) {}
+
+    override fun onActivityPaused(activity: Activity) {}
+
+    override fun onActivityStopped(activity: Activity) {}
+
+    override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {}
+
+    override fun onActivityDestroyed(activity: Activity) {}
 }

app/src/main/java/com/philkes/notallyx/presentation/UiExtensions.kt

@@ -531,6 +531,17 @@ fun Activity.checkAlarmPermission(
     } else onSuccess()
 }
 
+fun Activity.setEnabledSecureFlag(enabled: Boolean) {
+    if (enabled) {
+        window.setFlags(
+            WindowManager.LayoutParams.FLAG_SECURE,
+            WindowManager.LayoutParams.FLAG_SECURE,
+        )
+    } else {
+        window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)
+    }
+}
+
 fun Fragment.displayEditLabelDialog(
     oldValue: String,
     model: BaseNoteModel,

app/src/main/java/com/philkes/notallyx/presentation/activity/main/fragment/settings/SettingsFragment.kt

@@ -33,6 +33,7 @@ import com.philkes.notallyx.databinding.DialogTextInputBinding
 import com.philkes.notallyx.databinding.FragmentSettingsBinding
 import com.philkes.notallyx.presentation.activity.main.MainActivity
 import com.philkes.notallyx.presentation.setCancelButton
+import com.philkes.notallyx.presentation.setEnabledSecureFlag
 import com.philkes.notallyx.presentation.setupImportProgressDialog
 import com.philkes.notallyx.presentation.setupProgressDialog
 import com.philkes.notallyx.presentation.showAndFocus
@@ -592,6 +593,14 @@ class SettingsFragment : Fragment() {
                 model.savePreference(backupPassword, newValue)
             }
         }
+
+        secureFlag.observe(viewLifecycleOwner) { value ->
+            binding.SecureFlag.setup(secureFlag, value, requireContext(), layoutInflater) { newValue
+                ->
+                model.savePreference(secureFlag, newValue)
+                activity?.setEnabledSecureFlag(newValue)
+            }
+        }
     }
 
     private fun NotallyXPreferences.setupSettings(binding: FragmentSettingsBinding) {

app/src/main/java/com/philkes/notallyx/presentation/viewmodel/preference/NotallyXPreferences.kt

@@ -135,6 +135,8 @@ class NotallyXPreferences private constructor(private val context: Context) {
     val fallbackDatabaseEncryptionKey by lazy {
         ByteArrayPreference("fallback_database_encryption_key", encryptedPreferences, ByteArray(0))
     }
+    val secureFlag =
+        BooleanPreference("secureFlag", preferences, false, R.string.disallow_screenshots)
 
     val dataInPublicFolder =
         BooleanPreference("dataOnExternalStorage", preferences, false, R.string.data_in_public)
@@ -223,6 +225,7 @@ class NotallyXPreferences private constructor(private val context: Context) {
                 maxItems,
                 maxLines,
                 maxTitle,
+                secureFlag,
                 labelsHidden,
                 labelTagsHiddenInOverview,
                 maxLabels,

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

@@ -173,6 +173,10 @@
           android:id="@+id/BackupPassword"
           layout="@layout/preference" />
 
+        <include
+          android:id="@+id/SecureFlag"
+          layout="@layout/preference" />
+
         <View
             android:layout_width="match_parent"
             android:layout_height="1dp"

app/src/main/res/values-de/strings.xml

@@ -119,6 +119,7 @@
     <string name="disable_lock_description">Dies entschlüsselt außerdem die Datenbank</string>
     <string name="disable_lock_title">Deaktivierte Biometrie/PIN Sperre</string>
     <string name="disabled">Deaktiviert</string>
+    <string name="disallow_screenshots">Screenshots verbieten</string>
     <string name="discard">Verwerfen</string>
     <string name="display_text">Anzeigetext</string>
     <string name="donate">Spende</string>

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

@@ -121,6 +121,7 @@
     <string name="disable_lock_description">This will also decrypt the database</string>
     <string name="disable_lock_title">Disable lock via Biometric/PIN</string>
     <string name="disabled">Disabled</string>
+    <string name="disallow_screenshots">Disallow Screenshots</string>
     <string name="discard">Discard</string>
     <string name="display_text">Text to display</string>
     <string name="donate">Make a Donation</string>