Turn on location dialog when using twilight scheduling

Night light and Dark theme scheduling does not work when in
twiligth mode. For the reason, we added a dialog to inform the user
that they need to turn on location services first.

Fixes: 153115618
Fixes: 153115261
Test: manual
Change-Id: Iea51018a7caba5c0ec93e058ee047d067bc03867

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

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2020 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.app.AlertDialog;
+import android.content.Context;
+import android.content.Intent;
+import android.util.Log;
+
+import com.android.settings.R;
+import com.android.settings.Settings;
+
+/*
+ * This class lauches a dialog when users try to use twilight scheduling without
+ * turning on location services
+ */
+public class TwilightLocationDialog {
+    public static String TAG = "TwilightLocationDialog";
+
+    public static void show(Context context) {
+        final AlertDialog dialog = new AlertDialog.Builder(context)
+                .setPositiveButton(R.string.twilight_mode_launch_location, ((dialog1, which) -> {
+                    Log.d(TAG, "clicked forget");
+                    final Intent intent = new Intent();
+                    intent.setClass(context, Settings.LocationSettingsActivity.class);
+                    context.startActivity(intent);
+                }))
+                .setNegativeButton(R.string.cancel, null /* listener */)
+                .setMessage(R.string.twilight_mode_location_off_dialog_message)
+                .create();
+        dialog.show();
+    }
+}