1 /* 2 * Copyright (C) 2010 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.nfc; 18 19 import android.content.BroadcastReceiver; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.content.IntentFilter; 23 import android.nfc.NfcAdapter; 24 import android.os.UserManager; 25 import android.preference.Preference; 26 import android.preference.PreferenceScreen; 27 import android.preference.SwitchPreference; 28 29 import com.android.settings.R; 30 31 /** 32 * NfcEnabler is a helper to manage the Nfc on/off checkbox preference. It is 33 * turns on/off Nfc and ensures the summary of the preference reflects the 34 * current state. 35 */ 36 public class NfcEnabler implements Preference.OnPreferenceChangeListener { 37 private final Context mContext; 38 private final SwitchPreference mSwitch; 39 private final PreferenceScreen mAndroidBeam; 40 private final NfcAdapter mNfcAdapter; 41 private final IntentFilter mIntentFilter; 42 private boolean mBeamDisallowed; 43 44 private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 45 @Override 46 public void onReceive(Context context, Intent intent) { 47 String action = intent.getAction(); 48 if (NfcAdapter.ACTION_ADAPTER_STATE_CHANGED.equals(action)) { 49 handleNfcStateChanged(intent.getIntExtra(NfcAdapter.EXTRA_ADAPTER_STATE, 50 NfcAdapter.STATE_OFF)); 51 } 52 } 53 }; 54 NfcEnabler(Context context, SwitchPreference switchPreference, PreferenceScreen androidBeam)55 public NfcEnabler(Context context, SwitchPreference switchPreference, 56 PreferenceScreen androidBeam) { 57 mContext = context; 58 mSwitch = switchPreference; 59 mAndroidBeam = androidBeam; 60 mNfcAdapter = NfcAdapter.getDefaultAdapter(context); 61 mBeamDisallowed = ((UserManager) mContext.getSystemService(Context.USER_SERVICE)) 62 .hasUserRestriction(UserManager.DISALLOW_OUTGOING_BEAM); 63 64 if (mNfcAdapter == null) { 65 // NFC is not supported 66 mSwitch.setEnabled(false); 67 mAndroidBeam.setEnabled(false); 68 mIntentFilter = null; 69 return; 70 } 71 if (mBeamDisallowed) { 72 mAndroidBeam.setEnabled(false); 73 } 74 mIntentFilter = new IntentFilter(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED); 75 } 76 resume()77 public void resume() { 78 if (mNfcAdapter == null) { 79 return; 80 } 81 handleNfcStateChanged(mNfcAdapter.getAdapterState()); 82 mContext.registerReceiver(mReceiver, mIntentFilter); 83 mSwitch.setOnPreferenceChangeListener(this); 84 } 85 pause()86 public void pause() { 87 if (mNfcAdapter == null) { 88 return; 89 } 90 mContext.unregisterReceiver(mReceiver); 91 mSwitch.setOnPreferenceChangeListener(null); 92 } 93 onPreferenceChange(Preference preference, Object value)94 public boolean onPreferenceChange(Preference preference, Object value) { 95 // Turn NFC on/off 96 97 final boolean desiredState = (Boolean) value; 98 mSwitch.setEnabled(false); 99 100 if (desiredState) { 101 mNfcAdapter.enable(); 102 } else { 103 mNfcAdapter.disable(); 104 } 105 106 return false; 107 } 108 handleNfcStateChanged(int newState)109 private void handleNfcStateChanged(int newState) { 110 switch (newState) { 111 case NfcAdapter.STATE_OFF: 112 mSwitch.setChecked(false); 113 mSwitch.setEnabled(true); 114 mAndroidBeam.setEnabled(false); 115 mAndroidBeam.setSummary(R.string.android_beam_disabled_summary); 116 break; 117 case NfcAdapter.STATE_ON: 118 mSwitch.setChecked(true); 119 mSwitch.setEnabled(true); 120 mAndroidBeam.setEnabled(!mBeamDisallowed); 121 if (mNfcAdapter.isNdefPushEnabled() && !mBeamDisallowed) { 122 mAndroidBeam.setSummary(R.string.android_beam_on_summary); 123 } else { 124 mAndroidBeam.setSummary(R.string.android_beam_off_summary); 125 } 126 break; 127 case NfcAdapter.STATE_TURNING_ON: 128 mSwitch.setChecked(true); 129 mSwitch.setEnabled(false); 130 mAndroidBeam.setEnabled(false); 131 break; 132 case NfcAdapter.STATE_TURNING_OFF: 133 mSwitch.setChecked(false); 134 mSwitch.setEnabled(false); 135 mAndroidBeam.setEnabled(false); 136 break; 137 } 138 } 139 } 140