Refactor SoundSettings to use more preference controller.

- second round of refactoring SoundSettings to use preference
  controller.
- add controller for Emergency broadcast, Vibrate when ring, Phone
  ringtone, Alarm ringtone, and Notification ringtone.

Bug: 32276590
Test: make RunSettingsRoboTests
Change-Id: Iaff48ecb27bf156a5c8995de20ce7a440b094cdb

src/com/android/settings/notification/EmergencyBroadcastPreferenceController.java

@@ -0,0 +1,99 @@
+/*
+ * 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.notification;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.support.v7.preference.Preference;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.accounts.AccountRestrictionHelper;
+import com.android.settings.core.PreferenceController;
+import com.android.settingslib.RestrictedPreference;
+
+/**
+ * Base class for preference controller that handles preference that enforce adjust volume
+ * restriction
+ */
+public class EmergencyBroadcastPreferenceController extends PreferenceController {
+
+    private static final String KEY_CELL_BROADCAST_SETTINGS = "cell_broadcast_settings";
+
+    private AccountRestrictionHelper mHelper;
+    private UserManager mUserManager;
+    private PackageManager mPm;
+    private boolean mCellBroadcastAppLinkEnabled;
+
+    public EmergencyBroadcastPreferenceController(Context context) {
+        this(context, new AccountRestrictionHelper(context));
+    }
+
+    @VisibleForTesting
+    EmergencyBroadcastPreferenceController(Context context, AccountRestrictionHelper helper) {
+        super(context);
+        mHelper = helper;
+        mUserManager = UserManager.get(context);
+        mPm = mContext.getPackageManager();
+        // Enable link to CMAS app settings depending on the value in config.xml.
+        mCellBroadcastAppLinkEnabled = isCellBroadcastAppLinkEnabled();
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        if (!(preference instanceof RestrictedPreference)) {
+            return;
+        }
+        ((RestrictedPreference) preference).checkRestrictionAndSetDisabled(
+            UserManager.DISALLOW_CONFIG_CELL_BROADCASTS);
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        return false;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_CELL_BROADCAST_SETTINGS;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mUserManager.isAdminUser() && mCellBroadcastAppLinkEnabled
+            && !mHelper.hasBaseUserRestriction(
+                UserManager.DISALLOW_CONFIG_CELL_BROADCASTS, UserHandle.myUserId());
+    }
+
+    private boolean isCellBroadcastAppLinkEnabled() {
+        boolean enabled = mContext.getResources().getBoolean(
+            com.android.internal.R.bool.config_cellBroadcastAppLinks);
+        if (enabled) {
+            try {
+                if (mPm.getApplicationEnabledSetting("com.android.cellbroadcastreceiver")
+                    == PackageManager.COMPONENT_ENABLED_STATE_DISABLED) {
+                    enabled = false;  // CMAS app disabled
+                }
+            } catch (IllegalArgumentException ignored) {
+                enabled = false;  // CMAS app not installed
+            }
+        }
+        return enabled;
+    }
+
+}