[DO NOT MERGE] Allow a settings override for double-line clock

This setting allows users to always show a single-line format clock,
regardless of notification status.

Fixes: 194905512
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.display
Change-Id: I94ade1b2d968e5783750e7a98a9a5d28cc22b659

src/com/android/settings/display/LockscreenClockPreferenceController.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.display;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settings.core.TogglePreferenceController;
+
+/**
+ * Preference to enable/disable the large double-line clock on lockscreen
+ */
+public class LockscreenClockPreferenceController extends TogglePreferenceController {
+
+    private static final String SETTING_KEY = Settings.Secure.LOCKSCREEN_USE_DOUBLE_LINE_CLOCK;
+
+    public LockscreenClockPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getInt(mContext.getContentResolver(), SETTING_KEY, 1) != 0;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putInt(mContext.getContentResolver(), SETTING_KEY,
+                isChecked ? 1 : 0);
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return mContext.getText(R.string.lockscreen_double_line_clock_summary);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        preference.setEnabled(true);
+        refreshSummary(preference);
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_display;
+    }
+}