Add a DashboardContainerFragment to host DashboardSummary.

Eventually the container fragment will host more dashboard-type
fragments. For now it's just DashboardSummary.

Change-Id: I217ad71c2f2bbc4b7247c9dd2c3c2b8c8660d945

src/com/android/settings/dashboard/DashboardContainerFragment.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2016 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.dashboard;
+
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.os.Bundle;
+import android.support.v13.app.FragmentPagerAdapter;
+import android.support.v4.view.ViewPager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.android.settings.InstrumentedFragment;
+import com.android.settings.R;
+
+/**
+ * Container for Dashboard fragments.
+ */
+public final class DashboardContainerFragment extends InstrumentedFragment {
+
+    private ViewPager mViewPager;
+    private DashboardViewPagerAdapter mPagerAdapter;
+
+    @Override
+    protected int getMetricsCategory() {
+        return DASHBOARD_CONTAINER;
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
+        final View content = inflater.inflate(R.layout.dashboard_container, parent, false);
+        mViewPager = (ViewPager) content.findViewById(R.id.pager);
+        mPagerAdapter = new DashboardViewPagerAdapter(getChildFragmentManager());
+        mViewPager.setAdapter(mPagerAdapter);
+        return content;
+    }
+
+    private static final class DashboardViewPagerAdapter extends FragmentPagerAdapter {
+
+
+        public DashboardViewPagerAdapter(FragmentManager fragmentManager) {
+            super(fragmentManager);
+        }
+
+        @Override
+        public Fragment getItem(int position) {
+            switch (position) {
+                case 0:
+                    return new DashboardSummary();
+                default:
+                    throw new IllegalArgumentException(
+                            String.format(
+                                    "Position %d does not map to a valid dashboard fragment",
+                                    position));
+            }
+        }
+
+        @Override
+        public int getCount() {
+            return 1;
+        }
+    }
+}