Fix #1098 Prevent screen capture

app/src/main/java/it/niedermann/owncloud/notes/LockedActivity.java

@@ -3,14 +3,15 @@ package it.niedermann.owncloud.notes;
 import android.app.KeyguardManager;
 import android.content.Context;
 import android.content.Intent;
-import android.os.Build;
 import android.os.Bundle;
 import android.util.Log;
+import android.view.WindowManager;
 
 import androidx.annotation.Nullable;
+import androidx.preference.PreferenceManager;
 
-import it.niedermann.owncloud.notes.exception.ExceptionHandler;
 import it.niedermann.owncloud.notes.branding.BrandedActivity;
+import it.niedermann.owncloud.notes.exception.ExceptionHandler;
 
 public abstract class LockedActivity extends BrandedActivity {
 
@@ -25,6 +26,10 @@ public abstract class LockedActivity extends BrandedActivity {
 
         Thread.currentThread().setUncaughtExceptionHandler(new ExceptionHandler(this));
 
+        if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean(getString(R.string.pref_key_prevent_screen_capture), false)) {
+            getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
         if (isTaskRoot()) {
             askToUnlock();
         }

app/src/main/java/it/niedermann/owncloud/notes/preferences/PreferencesFragment.java

@@ -12,13 +12,13 @@ import androidx.preference.ListPreference;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
 
+import it.niedermann.owncloud.notes.NotesApplication;
 import it.niedermann.owncloud.notes.R;
 import it.niedermann.owncloud.notes.branding.Branded;
 import it.niedermann.owncloud.notes.branding.BrandedSwitchPreference;
 import it.niedermann.owncloud.notes.branding.BrandingUtil;
 import it.niedermann.owncloud.notes.persistence.SyncWorker;
 import it.niedermann.owncloud.notes.shared.util.DeviceCredentialUtil;
-import it.niedermann.owncloud.notes.NotesApplication;
 
 import static it.niedermann.owncloud.notes.widget.notelist.NoteListWidget.updateNoteListWidgets;
 
@@ -31,6 +31,7 @@ public class PreferencesFragment extends PreferenceFragmentCompat implements Bra
     private BrandedSwitchPreference wifiOnlyPref;
     private BrandedSwitchPreference brandingPref;
     private BrandedSwitchPreference gridViewPref;
+    private BrandedSwitchPreference preventScreenCapturePref;
 
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
@@ -70,16 +71,15 @@ public class PreferencesFragment extends PreferenceFragmentCompat implements Bra
             Log.e(TAG, "Could not find preference with key: \"" + getString(R.string.pref_key_branding) + "\"");
         }
 
+        preventScreenCapturePref = findPreference(getString(R.string.pref_key_prevent_screen_capture));
+        if (preventScreenCapturePref == null) {
+            Log.e(TAG, "Could not find \"" + getString(R.string.pref_key_prevent_screen_capture) + "\"-preference.");
+        }
+
         lockPref = findPreference(getString(R.string.pref_key_lock));
         if (lockPref != null) {
             if (!DeviceCredentialUtil.areCredentialsAvailable(requireContext())) {
                 lockPref.setVisible(false);
-                Preference securityCategory = findPreference(getString(R.string.pref_category_security));
-                if (securityCategory != null) {
-                    securityCategory.setVisible(false);
-                } else {
-                    Log.e(TAG, "Could not find preference " + getString(R.string.pref_category_security));
-                }
             } else {
                 lockPref.setOnPreferenceChangeListener((preference, newValue) -> {
                     NotesApplication.setLockedPreference((Boolean) newValue);
@@ -134,5 +134,6 @@ public class PreferencesFragment extends PreferenceFragmentCompat implements Bra
         wifiOnlyPref.applyBrand(mainColor, textColor);
         brandingPref.applyBrand(mainColor, textColor);
         gridViewPref.applyBrand(mainColor, textColor);
+        preventScreenCapturePref.applyBrand(mainColor, textColor);
     }
 }

app/src/main/res/drawable/ic_baseline_screen_lock_portrait_24.xml

+<vector android:height="24dp" android:tint="#757575"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M10,16h4c0.55,0 1,-0.45 1,-1v-3c0,-0.55 -0.45,-1 -1,-1v-1c0,-1.11 -0.9,-2 -2,-2 -1.11,0 -2,0.9 -2,2v1c-0.55,0 -1,0.45 -1,1v3c0,0.55 0.45,1 1,1zM10.8,10c0,-0.66 0.54,-1.2 1.2,-1.2 0.66,0 1.2,0.54 1.2,1.2v1h-2.4v-1zM17,1L7,1c-1.1,0 -2,0.9 -2,2v18c0,1.1 0.9,2 2,2h10c1.1,0 2,-0.9 2,-2L19,3c0,-1.1 -0.9,-2 -2,-2zM17,19L7,19L7,5h10v14z"/>
+</vector>

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

@@ -45,6 +45,7 @@
     <string name="settings_lock">App lock (Beta)</string>
     <string name="settings_lock_summary">Device credentials</string>
     <string name="settings_background_sync">Background synchronization</string>
+    <string name="settings_prevent_screen_capture">Prevent screen capture</string>
 
     <string name="error_sync">Synchronization failed: %1$s</string>
     <string name="error_synchronization">Synchronization failed</string>
@@ -103,6 +104,7 @@
     <string name="pref_key_font_size" translatable="false">fontSize</string>
     <string name="pref_key_wifi_only" translatable="false">wifiOnly</string>
     <string name="pref_key_lock" translatable="false">lock</string>
+    <string name="pref_key_prevent_screen_capture" translatable="false">preventScreenCapture</string>
     <string name="pref_category_security" translatable="false">security</string>
     <string name="pref_key_last_note_mode" translatable="false">lastNoteMode</string>
     <string name="pref_key_background_sync" translatable="false">backgroundSync</string>

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

@@ -95,6 +95,13 @@
             android:layout="@layout/item_pref"
             android:summary="@string/settings_lock_summary"
             android:title="@string/settings_lock" />
+
+        <it.niedermann.owncloud.notes.branding.BrandedSwitchPreference
+            android:defaultValue="false"
+            android:icon="@drawable/ic_baseline_screen_lock_portrait_24"
+            android:key="@string/pref_key_prevent_screen_capture"
+            android:layout="@layout/item_pref"
+            android:title="@string/settings_prevent_screen_capture" />
     </it.niedermann.owncloud.notes.branding.BrandedPreferenceCategory>
 
 </PreferenceScreen>