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