Home Controls: Add Device Controls settings

Add a setting that would not require authorization for device controls.

Fixes: 216102581
Test: manual
Change-Id: I1fd98a2fbc1cea44d0b2c3612dd1616a053af394

src/com/android/settings/security/LockscreenDashboardFragment.java

@@ -21,8 +21,13 @@ import static android.app.admin.DevicePolicyResources.Strings.Settings.WORK_PROF
 
 import android.app.settings.SettingsEnums;
 import android.content.Context;
+import android.database.ContentObserver;
 import android.hardware.display.AmbientDisplayConfiguration;
+import android.net.Uri;
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.provider.Settings;
 
 import androidx.annotation.VisibleForTesting;
 
@@ -68,6 +73,8 @@ public class LockscreenDashboardFragment extends DashboardFragment
 
     private AmbientDisplayConfiguration mConfig;
     private OwnerInfoPreferenceController mOwnerInfoPreferenceController;
+    @VisibleForTesting
+    ContentObserver mControlsContentObserver;
 
     @Override
     public int getMetricsCategory() {
@@ -106,6 +113,27 @@ public class LockscreenDashboardFragment extends DashboardFragment
         use(AmbientDisplayNotificationsPreferenceController.class).setConfig(getConfig(context));
         use(DoubleTapScreenPreferenceController.class).setConfig(getConfig(context));
         use(PickupGesturePreferenceController.class).setConfig(getConfig(context));
+
+        mControlsContentObserver = new ContentObserver(
+                new Handler(Looper.getMainLooper())) {
+            @Override
+            public void onChange(boolean selfChange, Uri uri) {
+                super.onChange(selfChange, uri);
+                updatePreferenceStates();
+            }
+        };
+        context.getContentResolver().registerContentObserver(
+                Settings.Secure.getUriFor(Settings.Secure.LOCKSCREEN_SHOW_CONTROLS),
+                false /* notifyForDescendants */, mControlsContentObserver);
+    }
+
+    @Override
+    public void onDetach() {
+        if (mControlsContentObserver != null) {
+            getContext().getContentResolver().unregisterContentObserver(mControlsContentObserver);
+            mControlsContentObserver = null;
+        }
+        super.onDetach();
     }
 
     @Override