Add storage dashborad page.

Refactor shared dashboard page display logic between storage and
system page.

Bug: 31800690
Test: RunSettingsRoboTests

Change-Id: I7eb86f590b79ab871bdb383fb2f5326790beb193

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

@@ -0,0 +1,122 @@
+/*
+ * 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.Activity;
+import android.content.Context;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.TextUtils;
+import android.util.ArrayMap;
+import android.util.Log;
+
+import com.android.settings.SettingsPreferenceFragment;
+import com.android.settings.core.PreferenceController;
+import com.android.settings.overlay.FeatureFactory;
+import com.android.settings.search.Indexable;
+import com.android.settingslib.drawer.DashboardCategory;
+import com.android.settingslib.drawer.SettingsDrawerActivity;
+import com.android.settingslib.drawer.Tile;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Base fragment for dashboard style UI containing a list of static and dynamic setting items.
+ */
+public abstract class DashboardFragment extends SettingsPreferenceFragment
+        implements SettingsDrawerActivity.CategoryListener, Indexable {
+
+    private final Map<Class, PreferenceController> mPreferenceControllers =
+            new ArrayMap<>();
+
+    protected DashboardFeatureProvider mDashboardFeatureProvider;
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        mDashboardFeatureProvider =
+                FeatureFactory.getFactory(context).getDashboardFeatureProvider(context);
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        final Activity activity = getActivity();
+        if (activity instanceof SettingsDrawerActivity) {
+            ((SettingsDrawerActivity) activity).addCategoryListener(this);
+        }
+    }
+
+    @Override
+    public boolean onPreferenceTreeClick(Preference preference) {
+        Collection<PreferenceController> controllers = mPreferenceControllers.values();
+        // Give all controllers a chance to handle click.
+        for (PreferenceController controller : controllers) {
+            if (controller.handlePreferenceTreeClick(preference)) {
+                return true;
+            }
+        }
+        return super.onPreferenceTreeClick(preference);
+    }
+
+    @Override
+    public void onStop() {
+        super.onStop();
+        final Activity activity = getActivity();
+        if (activity instanceof SettingsDrawerActivity) {
+            ((SettingsDrawerActivity) activity).remCategoryListener(this);
+        }
+    }
+
+    protected <T extends PreferenceController> T getPreferenceController(Class<T> clazz) {
+        PreferenceController controller = mPreferenceControllers.get(clazz);
+        return (T) controller;
+    }
+
+    protected void addPreferenceController(PreferenceController controller) {
+        mPreferenceControllers.put(controller.getClass(), controller);
+    }
+
+    protected final void displayTilesAsPreference(String TAG, PreferenceScreen screen,
+            DashboardCategory category) {
+        final Context context = getContext();
+        List<Tile> tiles = category.tiles;
+        for (Tile tile : tiles) {
+            final String key = mDashboardFeatureProvider.getDashboardKeyForTile(tile);
+            if (TextUtils.isEmpty(key)) {
+                Log.d(TAG, "tile does not contain a key, skipping " + tile);
+                continue;
+            }
+            final Preference pref = new DashboardTilePreference(context);
+            pref.setTitle(tile.title);
+            pref.setKey(key);
+            pref.setSummary(tile.summary);
+            if (tile.icon != null) {
+                pref.setIcon(tile.icon.loadDrawable(context));
+            }
+            if (tile.intent != null) {
+                pref.setIntent(tile.intent);
+            }
+            // Use negated priority for order, because tile priority is based on intent-filter
+            // (larger value has higher priority). However pref order defines smaller value has
+            // higher priority.
+            pref.setOrder(-tile.priority);
+            screen.addPreference(pref);
+        }
+    }
+}