Prevent screen from viewed on task manager (cause it's ecchi :})

app/src/main/java/xyz/quaver/pupil/GalleryActivity.kt

@@ -27,6 +27,10 @@ class GalleryActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_gallery)
 
+        window.setFlags(
+            WindowManager.LayoutParams.FLAG_SECURE,
+            WindowManager.LayoutParams.FLAG_SECURE)
+
         galleryID = intent.getIntExtra("GALLERY_ID", 0)
         CoroutineScope(Dispatchers.Unconfined).launch {
             reader = async(Dispatchers.IO) {

app/src/main/java/xyz/quaver/pupil/MainActivity.kt

@@ -17,6 +17,7 @@ import android.text.*
 import android.text.style.AlignmentSpan
 import android.util.Log
 import android.view.View
+import android.view.WindowManager
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.app.ActivityCompat
@@ -52,6 +53,10 @@ class MainActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
+        window.setFlags(
+            WindowManager.LayoutParams.FLAG_SECURE,
+            WindowManager.LayoutParams.FLAG_SECURE)
+
         checkPermission()
 
         update()

app/src/main/java/xyz/quaver/pupil/SettingsActivity.kt

@@ -2,6 +2,7 @@ package xyz.quaver.pupil
 
 import android.os.Bundle
 import android.view.MenuItem
+import android.view.WindowManager
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.preference.Preference
@@ -17,6 +18,10 @@ class SettingsActivity : AppCompatActivity() {
             .replace(R.id.settings, SettingsFragment())
             .commit()
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
+
+        window.setFlags(
+            WindowManager.LayoutParams.FLAG_SECURE,
+            WindowManager.LayoutParams.FLAG_SECURE)
     }
 
     class SettingsFragment : PreferenceFragmentCompat() {