BLE peripheral mode (4/4): Settings change for advertising preference.

Change-Id: I5721f136267fe25e55f764bb4a6c53acd45b318b

src/com/android/settings/bluetooth/BluetoothAdvertisingEnabler.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2013 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.bluetooth;
+
+import android.content.Context;
+import android.preference.PreferenceScreen;
+
+import com.android.settings.R;
+
+/**
+ * BluetoothAdvertisingEnabler helps manager change of bluetooth advertising preferences.
+ */
+final class BluetoothAdvertisingEnabler {
+
+    private final Context mContext;
+    private final PreferenceScreen mBluetoothAdvertisingPreference;
+
+    public BluetoothAdvertisingEnabler(Context context, PreferenceScreen bluetoothBroadcast) {
+        mContext = context;
+        mBluetoothAdvertisingPreference = bluetoothBroadcast;
+    }
+
+    public void resume() {
+        boolean isBroadcastingEnable = LocalBluetoothPreferences.isAdvertisingEnabled(mContext);
+        handleAdvertisingStateChange(isBroadcastingEnable);
+    }
+
+    private void handleAdvertisingStateChange(boolean isBroadcastingEnable) {
+        mBluetoothAdvertisingPreference.setSummary(isBroadcastingEnable ?
+                R.string.bluetooth_broadcasting_state_on :
+                    R.string.bluetooth_broadcasting_state_off);
+    }
+}