Settings>Security>Show notifications (on the lockscreen).

Allows the user to toggle
Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS,
which if set shows the complete private contents of that
user's notifications atop a securely locked screen. When
unset, only the "public" versions of notifications are shown
(which may include explicit redactions made by the app).
See f/b change I32bb7939 for details.

This checkbox is hidden for insecure keyguards ("off" and
"none"). It is also unavailable if
Settings.Global.LOCK_SCREEN_SHOW_NOTIFICATIONS is not set
(see f/b change I9c517949.)

Change-Id: Ie1b4c6b949b597b97e536d8ea7e35c9de9b6995f

res/values/strings.xml

@@ -4993,4 +4993,16 @@
     <string name="dashboard_title">Overview</string>
     <string name="dashboard_wip" translatable="false">Overview - work in progress\n\nUse the Drawer on the left to see the settings list</string>
 
+    <!-- Notifications on lockscreen -->
+    <!-- Label for checkbox controlling the contents of notifications shown on
+         the secure lockscreen [CHAR LIMIT=16] -->
+    <string name="lock_screen_notifications">Show notifications</string>
+    <!-- Summary for lock_screen_notifications: sensitive information will be
+         hidden or redacted from notifications shown on a secure lock screen
+         [CHAR LIMIT=50] -->
+    <string name="lock_screen_notifications_summary_off">Sensitive notification contents will be hidden when locked</string>
+    <!-- Summary for lock_screen_notifications: all information will be
+         shown in notifications shown on a secure lock screen
+         [CHAR LIMIT=50] -->
+    <string name="lock_screen_notifications_summary_on">All notification contents will be shown when locked</string>
 </resources>

res/xml/security_settings_biometric_weak.xml

@@ -66,6 +66,13 @@
             android:title="@string/nfc_unlock_title"
             android:persistent="false"/>
 
+        <CheckBoxPreference
+            android:key="toggle_lock_screen_notifications"
+            android:title="@string/lock_screen_notifications"
+            android:summaryOff="@string/lock_screen_notifications_summary_off"
+            android:summaryOn="@string/lock_screen_notifications_summary_on"
+            android:persistent="false" />
+
     </PreferenceCategory>
 
 </PreferenceScreen>

res/xml/security_settings_password.xml

@@ -53,6 +53,13 @@
             android:title="@string/nfc_unlock_title"
             android:persistent="false"/>
 
+        <CheckBoxPreference
+            android:key="toggle_lock_screen_notifications"
+            android:title="@string/lock_screen_notifications"
+            android:summaryOff="@string/lock_screen_notifications_summary_off"
+            android:summaryOn="@string/lock_screen_notifications_summary_on"
+            android:persistent="false" />
+
     </PreferenceCategory>
 
 </PreferenceScreen>

res/xml/security_settings_pattern.xml

@@ -57,6 +57,13 @@
             android:title="@string/nfc_unlock_title"
             android:persistent="false"/>
 
+        <CheckBoxPreference
+            android:key="toggle_lock_screen_notifications"
+            android:title="@string/lock_screen_notifications"
+            android:summaryOff="@string/lock_screen_notifications_summary_off"
+            android:summaryOn="@string/lock_screen_notifications_summary_on"
+            android:persistent="false" />
+
     </PreferenceCategory>
 
 </PreferenceScreen>

res/xml/security_settings_pin.xml

@@ -53,6 +53,13 @@
             android:title="@string/nfc_unlock_title"
             android:persistent="false"/>
 
+        <CheckBoxPreference
+            android:key="toggle_lock_screen_notifications"
+            android:title="@string/lock_screen_notifications"
+            android:summaryOff="@string/lock_screen_notifications_summary_off"
+            android:summaryOn="@string/lock_screen_notifications_summary_on"
+            android:persistent="false" />
+
     </PreferenceCategory>
 
 </PreferenceScreen>

src/com/android/settings/SecuritySettings.java

@@ -31,7 +31,6 @@ import android.content.pm.ResolveInfo;
 import android.content.pm.UserInfo;
 import android.nfc.NfcUnlock;
 import android.os.Bundle;
-import android.os.SystemProperties;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.preference.CheckBoxPreference;
@@ -86,6 +85,7 @@ public class SecuritySettings extends RestrictedSettingsFragment
     private static final String KEY_POWER_INSTANTLY_LOCKS = "power_button_instantly_locks";
     private static final String KEY_CREDENTIALS_MANAGER = "credentials_management";
     private static final String KEY_NOTIFICATION_ACCESS = "manage_notification_access";
+    private static final String KEY_LOCK_SCREEN_NOTIFICATIONS = "toggle_lock_screen_notifications";
     private static final String PACKAGE_MIME_TYPE = "application/vnd.android.package-archive";
 
     private PackageManager mPM;
@@ -110,6 +110,7 @@ public class SecuritySettings extends RestrictedSettingsFragment
     private CheckBoxPreference mEnableKeyguardWidgets;
 
     private Preference mNotificationAccess;
+    private CheckBoxPreference mLockscreenNotifications;
 
     private boolean mIsPrimary;
 
@@ -355,9 +356,34 @@ public class SecuritySettings extends RestrictedSettingsFragment
             protectByRestrictions(mResetCredentials);
             protectByRestrictions(root.findPreference(KEY_CREDENTIALS_INSTALL));
         }
+
+        mLockscreenNotifications
+                = (CheckBoxPreference) root.findPreference(KEY_LOCK_SCREEN_NOTIFICATIONS);
+        if (mLockscreenNotifications != null) {
+            if (!getDeviceLockscreenNotificationsEnabled()) {
+                final PreferenceGroup lockscreenCategory =
+                        (PreferenceGroup) root.findPreference(KEY_SECURITY_CATEGORY);
+                if (lockscreenCategory != null) {
+                    lockscreenCategory.removePreference(mLockscreenNotifications);
+                }
+            } else {
+                mLockscreenNotifications.setChecked(getLockscreenAllowPrivateNotifications());
+            }
+        }
+
         return root;
     }
 
+    private boolean getDeviceLockscreenNotificationsEnabled() {
+        return 0 != Settings.Global.getInt(getContentResolver(),
+                Settings.Global.LOCK_SCREEN_SHOW_NOTIFICATIONS, 0);
+    }
+
+    private boolean getLockscreenAllowPrivateNotifications() {
+        return 0 != Settings.Secure.getInt(getContentResolver(),
+                Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS, 0);
+    }
+
     private int getNumEnabledNotificationListeners() {
         final String flat = Settings.Secure.getString(getContentResolver(),
                 Settings.Secure.ENABLED_NOTIFICATION_LISTENERS);
@@ -591,6 +617,10 @@ public class SecuritySettings extends RestrictedSettingsFragment
         } else if (KEY_TOGGLE_VERIFY_APPLICATIONS.equals(key)) {
             Settings.Global.putInt(getContentResolver(), Settings.Global.PACKAGE_VERIFIER_ENABLE,
                     mToggleVerifyApps.isChecked() ? 1 : 0);
+        } else if (KEY_LOCK_SCREEN_NOTIFICATIONS.equals(key)) {
+            Settings.Secure.putInt(getContentResolver(),
+                    Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS,
+                    mLockscreenNotifications.isChecked() ? 1 : 0);
         } else {
             // If we didn't handle it, let preferences handle it.
             return super.onPreferenceTreeClick(preferenceScreen, preference);