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/deviceinfo/ManageStoragePreferenceController.java

@@ -0,0 +1,52 @@
+/*
+ * 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.deviceinfo;
+
+import android.content.Context;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.PreferenceController;
+
+public class ManageStoragePreferenceController extends PreferenceController {
+
+    public static final String KEY_MANAGE_STORAGE = "pref_manage_storage";
+
+    public ManageStoragePreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        if (!isAvailable()) {
+            removePreference(screen, KEY_MANAGE_STORAGE);
+        }
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        return false;
+    }
+
+    /**
+     * Whether a preference should be available on screen.
+     */
+    private boolean isAvailable() {
+        return mContext.getResources().getBoolean(R.bool.config_storage_manager_settings_enabled);
+    }
+}
+

src/com/android/settings/deviceinfo/StorageDashboardFragment.java

@@ -0,0 +1,65 @@
+/*
+ * 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.deviceinfo;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+
+public class StorageDashboardFragment extends DashboardFragment {
+
+    private static final String TAG = "StorageDashboardFrag";
+
+    @Override
+    public int getMetricsCategory() {
+        return STORAGE_CATEGORY_FRAGMENT;
+    }
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        addPreferenceController(new ManageStoragePreferenceController(context));
+    }
+
+    @Override
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+        super.onCreatePreferences(savedInstanceState, rootKey);
+        refreshAllPreferences();
+    }
+
+    @Override
+    public void onCategoriesChanged() {
+        refreshAllPreferences();
+    }
+
+    private void refreshAllPreferences() {
+        PreferenceScreen screen = getPreferenceScreen();
+        if (screen != null) {
+            screen.removeAll();
+        }
+        addPreferencesFromResource(R.xml.storage_dashboard_fragment);
+
+        getPreferenceController(ManageStoragePreferenceController.class)
+                .displayPreference(getPreferenceScreen());
+
+        displayTilesAsPreference(TAG, getPreferenceScreen(),
+                mDashboardFeatureProvider.getTilesForStorageCategory());
+    }
+}

src/com/android/settings/deviceinfo/SystemUpdatePreferenceController.java

@@ -27,29 +27,27 @@ import android.util.Log;
 
 import com.android.settings.R;
 import com.android.settings.Utils;
+import com.android.settings.core.PreferenceController;
 
 import java.util.List;
 
 import static android.content.Context.CARRIER_CONFIG_SERVICE;
 
-public class SystemUpdatePreferenceController {
+public class SystemUpdatePreferenceController extends PreferenceController {
 
     private static final String TAG = "SysUpdatePrefContr";
 
     static final String KEY_SYSTEM_UPDATE_SETTINGS = "system_update_settings";
     static final String KEY_UPDATE_SETTING = "additional_system_update_settings";
 
-    private final Context mContext;
     private final UserManager mUm;
 
     public SystemUpdatePreferenceController(Context context, UserManager um) {
-        mContext = context;
+        super(context);
         mUm = um;
     }
 
-    /**
-     * Displays preference in this controller.
-     */
+    @Override
     public void displayPreference(PreferenceScreen screen) {
         if (isAvailable(mContext, KEY_SYSTEM_UPDATE_SETTINGS)) {
             Utils.updatePreferenceToSpecificActivityOrRemove(mContext, screen,
@@ -79,12 +77,7 @@ public class SystemUpdatePreferenceController {
         }
     }
 
-    /**
-     * Handles preference tree click
-     *
-     * @param preference the preference being clicked
-     * @return true if click is handled
-     */
+    @Override
     public boolean handlePreferenceTreeClick(Preference preference) {
         if (KEY_SYSTEM_UPDATE_SETTINGS.equals(preference.getKey())) {
             CarrierConfigManager configManager =
@@ -113,16 +106,6 @@ public class SystemUpdatePreferenceController {
         }
     }
 
-    /**
-     * Removes preference from screen.
-     */
-    private void removePreference(PreferenceScreen screen, String key) {
-        Preference pref = screen.findPreference(key);
-        if (pref != null) {
-            screen.removePreference(pref);
-        }
-    }
-
     /**
      * Trigger client initiated action (send intent) on system update
      */