Revert "Revert "First commit of dynamic home page feature""

This reverts commit 457f6ef140.

Reason for revert: fix the color check in repohook

Test: make RunSettingsRoboTests

Change-Id: I1b466c412138dfb0f2bffc4270a8932fe3b81c94

src/com/android/settings/SettingsHomepageActivity.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2018 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;
+
+import android.app.Activity;
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.FeatureFlagUtils;
+
+import com.android.settings.core.FeatureFlags;
+import com.android.settings.core.SettingsBaseActivity;
+import com.android.settings.homepage.HomepageFragment;
+
+public class SettingsHomepageActivity extends SettingsBaseActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (!isDynamicHomepageEnabled(this)) {
+            final Intent settings = new Intent();
+            settings.setAction("android.settings.SETTINGS");
+            startActivity(settings);
+            finish();
+        }
+        setContentView(R.layout.settings_homepage);
+        switchToFragment(this, R.id.main_content, HomepageFragment.class.getName());
+    }
+
+    public static boolean isDynamicHomepageEnabled(Context context) {
+        return FeatureFlagUtils.isEnabled(context, FeatureFlags.DYNAMIC_HOMEPAGE);
+    }
+
+    /**
+     * Switch to a specific Fragment
+     */
+    public static void switchToFragment(Activity activity, int id, String fragmentName) {
+        final Fragment f = Fragment.instantiate(activity, fragmentName, null /* args */);
+
+        FragmentManager manager = activity.getFragmentManager();
+        manager.beginTransaction().replace(id, f).commitAllowingStateLoss();
+        manager.executePendingTransactions();
+    }
+}