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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.CheckBoxPreference;
     25 import android.preference.Preference;
     26 import android.preference.PreferenceScreen;
     27 
     28 import com.android.settings.R;
     29 
     30 /**
     31  * NsdEnabler is a helper to manage network service discovery on/off checkbox state.
     32  */
     33 public class NsdEnabler implements Preference.OnPreferenceChangeListener {
     34     private final Context mContext;
     35     private final CheckBoxPreference mCheckbox;
     36     private final IntentFilter mIntentFilter;
     37     private NsdManager mNsdManager;
     38 
     39     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
     40         @Override
     41         public void onReceive(Context context, Intent intent) {
     42             String action = intent.getAction();
     43             if (NsdManager.ACTION_NSD_STATE_CHANGED.equals(action)) {
     44                 handleNsdStateChanged(intent.getIntExtra(NsdManager.EXTRA_NSD_STATE,
     45                         NsdManager.NSD_STATE_DISABLED));
     46             }
     47         }
     48     };
     49 
     50     public NsdEnabler(Context context, CheckBoxPreference checkBoxPreference) {
     51         mContext = context;
     52         mCheckbox = checkBoxPreference;
     53         mNsdManager = (NsdManager) mContext.getSystemService(Context.NSD_SERVICE);
     54         mIntentFilter = new IntentFilter(NsdManager.ACTION_NSD_STATE_CHANGED);
     55     }
     56 
     57     public void resume() {
     58         mContext.registerReceiver(mReceiver, mIntentFilter);
     59         mCheckbox.setOnPreferenceChangeListener(this);
     60     }
     61 
     62     public void pause() {
     63         mContext.unregisterReceiver(mReceiver);
     64         mCheckbox.setOnPreferenceChangeListener(null);
     65     }
     66 
     67     public boolean onPreferenceChange(Preference preference, Object value) {
     68 
     69         final boolean desiredState = (Boolean) value;
     70         mCheckbox.setEnabled(false);
     71         mNsdManager.setEnabled(desiredState);
     72         return false;
     73     }
     74 
     75     private void handleNsdStateChanged(int newState) {
     76         switch (newState) {
     77             case NsdManager.NSD_STATE_DISABLED:
     78                 mCheckbox.setChecked(false);
     79                 mCheckbox.setEnabled(true);
     80                 break;
     81             case NsdManager.NSD_STATE_ENABLED:
     82                 mCheckbox.setChecked(true);
     83                 mCheckbox.setEnabled(true);
     84                 break;
     85         }
     86     }
     87 }
     88