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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.IntentFilter;
     23 import android.net.nsd.NsdManager;
     24 import android.preference.Preference;
     25 
     26 import android.preference.SwitchPreference;
     27 
     28 /**
     29  * NsdEnabler is a helper to manage network service discovery on/off checkbox state.
     30  */
     31 public class NsdEnabler implements Preference.OnPreferenceChangeListener {
     32     private final Context mContext;
     33     private final SwitchPreference mSwitchPreference;
     34     private final IntentFilter mIntentFilter;
     35     private NsdManager mNsdManager;
     36 
     37     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     38         @Override
     39         public void onReceive(Context context, Intent intent) {
     40             String action = intent.getAction();
     41             if (NsdManager.ACTION_NSD_STATE_CHANGED.equals(action)) {
     42                 handleNsdStateChanged(intent.getIntExtra(NsdManager.EXTRA_NSD_STATE,
     43                         NsdManager.NSD_STATE_DISABLED));
     44             }
     45         }
     46     };
     47 
     48     public NsdEnabler(Context context, SwitchPreference pref) {
     49         mContext = context;
     50         mSwitchPreference = pref;
     51         mNsdManager = (NsdManager) mContext.getSystemService(Context.NSD_SERVICE);
     52         mIntentFilter = new IntentFilter(NsdManager.ACTION_NSD_STATE_CHANGED);
     53     }
     54 
     55     public void resume() {
     56         mContext.registerReceiver(mReceiver, mIntentFilter);
     57         mSwitchPreference.setOnPreferenceChangeListener(this);
     58     }
     59 
     60     public void pause() {
     61         mContext.unregisterReceiver(mReceiver);
     62         mSwitchPreference.setOnPreferenceChangeListener(null);
     63     }
     64 
     65     public boolean onPreferenceChange(Preference preference, Object value) {
     66 
     67         final boolean desiredState = (Boolean) value;
     68         mSwitchPreference.setEnabled(false);
     69         mNsdManager.setEnabled(desiredState);
     70         return false;
     71     }
     72 
     73     private void handleNsdStateChanged(int newState) {
     74         switch (newState) {
     75             case NsdManager.NSD_STATE_DISABLED:
     76                 mSwitchPreference.setChecked(false);
     77                 mSwitchPreference.setEnabled(true);
     78                 break;
     79             case NsdManager.NSD_STATE_ENABLED:
     80                 mSwitchPreference.setChecked(true);
     81                 mSwitchPreference.setEnabled(true);
     82                 break;
     83         }
     84     }
     85 }
     86