Add Nsd settings checkbox

Change-Id: I58e54a8bed02ed7bd99b0f284279b6c799e3369f

src/com/android/settings/NsdEnabler.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2012 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;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.nsd.NsdManager;
+import android.preference.CheckBoxPreference;
+import android.preference.Preference;
+import android.preference.PreferenceScreen;
+
+import com.android.settings.R;
+
+/**
+ * NsdEnabler is a helper to manage network service discovery on/off checkbox state.
+ */
+public class NsdEnabler implements Preference.OnPreferenceChangeListener {
+    private final Context mContext;
+    private final CheckBoxPreference mCheckbox;
+    private final IntentFilter mIntentFilter;
+    private NsdManager mNsdManager;
+
+    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            String action = intent.getAction();
+            if (NsdManager.ACTION_NSD_STATE_CHANGED.equals(action)) {
+                handleNsdStateChanged(intent.getIntExtra(NsdManager.EXTRA_NSD_STATE,
+                        NsdManager.NSD_STATE_DISABLED));
+            }
+        }
+    };
+
+    public NsdEnabler(Context context, CheckBoxPreference checkBoxPreference) {
+        mContext = context;
+        mCheckbox = checkBoxPreference;
+        mNsdManager = (NsdManager) mContext.getSystemService(Context.NSD_SERVICE);
+        mIntentFilter = new IntentFilter(NsdManager.ACTION_NSD_STATE_CHANGED);
+    }
+
+    public void resume() {
+        mContext.registerReceiver(mReceiver, mIntentFilter);
+        mCheckbox.setOnPreferenceChangeListener(this);
+    }
+
+    public void pause() {
+        mContext.unregisterReceiver(mReceiver);
+        mCheckbox.setOnPreferenceChangeListener(null);
+    }
+
+    public boolean onPreferenceChange(Preference preference, Object value) {
+
+        final boolean desiredState = (Boolean) value;
+        mCheckbox.setEnabled(false);
+        mNsdManager.setEnabled(desiredState);
+        return false;
+    }
+
+    private void handleNsdStateChanged(int newState) {
+        switch (newState) {
+            case NsdManager.NSD_STATE_DISABLED:
+                mCheckbox.setChecked(false);
+                mCheckbox.setEnabled(true);
+                break;
+            case NsdManager.NSD_STATE_ENABLED:
+                mCheckbox.setChecked(true);
+                mCheckbox.setEnabled(true);
+                break;
+        }
+    }
+}