Custom dark theme scheduling

allows the use to set the start and end automatic dark theme
activation within a day.

Test: run all settings tests
Change-Id: If96fc050159724d553acb09c2da4fab1d5ff519f

src/com/android/settings/display/darkmode/DarkModeSettingsFragment.java

@@ -14,14 +14,23 @@
 
 package com.android.settings.display.darkmode;
 
+import android.app.Dialog;
+import android.app.TimePickerDialog;
+import android.app.UiModeManager;
 import android.content.Context;
 import android.os.Bundle;
 import android.app.settings.SettingsEnums;
+import androidx.preference.Preference;
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.search.SearchIndexable;
 
+import java.time.LocalTime;
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Settings screen for Dark UI Mode
  */
@@ -29,15 +38,20 @@ import com.android.settingslib.search.SearchIndexable;
 public class DarkModeSettingsFragment extends DashboardFragment {
 
     private static final String TAG = "DarkModeSettingsFragment";
+    private static final String DARK_THEME_END_TIME = "dark_theme_end_time";
+    private static final String DARK_THEME_START_TIME = "dark_theme_start_time";
     private DarkModeObserver mContentObserver;
+    private DarkModeCustomPreferenceController mCustomStartController;
+    private DarkModeCustomPreferenceController mCustomEndController;
     private Runnable mCallback = () -> {
         updatePreferenceStates();
     };
+    private static final int DIALOG_START_TIME = 0;
+    private static final int DIALOG_END_TIME = 1;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-
         final Context context = getContext();
         mContentObserver = new DarkModeObserver(context);
     }
@@ -49,6 +63,18 @@ public class DarkModeSettingsFragment extends DashboardFragment {
         mContentObserver.subscribe(mCallback);
     }
 
+    @Override
+    protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
+        List<AbstractPreferenceController> controllers =  new ArrayList(2);
+        mCustomStartController = new DarkModeCustomPreferenceController(getContext(),
+                DARK_THEME_START_TIME, this);
+        mCustomEndController = new DarkModeCustomPreferenceController(getContext(),
+                DARK_THEME_END_TIME, this);
+        controllers.add(mCustomStartController);
+        controllers.add(mCustomEndController);
+        return controllers;
+    }
+
     @Override
     public void onStop() {
         super.onStop();
@@ -56,6 +82,34 @@ public class DarkModeSettingsFragment extends DashboardFragment {
         mContentObserver.unsubscribe();
     }
 
+    @Override
+    public boolean onPreferenceTreeClick(Preference preference) {
+        if (DARK_THEME_END_TIME.equals(preference.getKey())) {
+            showDialog(DIALOG_END_TIME);
+            return true;
+        } else if (DARK_THEME_START_TIME.equals(preference.getKey())) {
+            showDialog(DIALOG_START_TIME);
+            return true;
+        }
+        return super.onPreferenceTreeClick(preference);
+    }
+
+    public void refresh() {
+        this.updatePreferenceStates();
+    }
+
+    @Override
+    public Dialog onCreateDialog(final int dialogId) {
+        if (dialogId == DIALOG_START_TIME || dialogId == DIALOG_END_TIME) {
+            if (dialogId == DIALOG_START_TIME) {
+                return mCustomStartController.getDialog();
+            } else {
+                return mCustomEndController.getDialog();
+            }
+        }
+        return super.onCreateDialog(dialogId);
+    }
+
     @Override
     protected int getPreferenceScreenResId() {
         return R.xml.dark_mode_settings;
@@ -76,6 +130,18 @@ public class DarkModeSettingsFragment extends DashboardFragment {
         return SettingsEnums.DARK_UI_SETTINGS;
     }
 
+    @Override
+    public int getDialogMetricsCategory(int dialogId) {
+        switch (dialogId) {
+            case DIALOG_START_TIME:
+                return SettingsEnums.DIALOG_DARK_THEME_SET_START_TIME;
+            case DIALOG_END_TIME:
+                return SettingsEnums.DIALOG_DARK_THEME_SET_END_TIME;
+            default:
+                return 0;
+        }
+    }
+
     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider(R.xml.dark_mode_settings);
 }