1 /* 2 * Copyright (C) 2016 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 package com.android.settings.nfc; 17 18 import android.content.Context; 19 import android.content.IntentFilter; 20 import android.nfc.NfcAdapter; 21 import android.provider.Settings; 22 import android.text.TextUtils; 23 24 import android.support.v7.preference.Preference; 25 import android.support.v7.preference.PreferenceScreen; 26 import android.support.v14.preference.SwitchPreference; 27 28 import com.android.settings.core.TogglePreferenceController; 29 import com.android.settingslib.core.lifecycle.LifecycleObserver; 30 import com.android.settingslib.core.lifecycle.events.OnPause; 31 import com.android.settingslib.core.lifecycle.events.OnResume; 32 33 import java.util.List; 34 35 public class NfcPreferenceController extends TogglePreferenceController 36 implements LifecycleObserver, OnResume, OnPause { 37 38 public static final String KEY_TOGGLE_NFC = "toggle_nfc"; 39 private final NfcAdapter mNfcAdapter; 40 private NfcEnabler mNfcEnabler; 41 private NfcAirplaneModeObserver mAirplaneModeObserver; 42 NfcPreferenceController(Context context, String key)43 public NfcPreferenceController(Context context, String key) { 44 super(context, key); 45 mNfcAdapter = NfcAdapter.getDefaultAdapter(context); 46 } 47 48 @Override displayPreference(PreferenceScreen screen)49 public void displayPreference(PreferenceScreen screen) { 50 super.displayPreference(screen); 51 if (!isAvailable()) { 52 mNfcEnabler = null; 53 return; 54 } 55 56 final SwitchPreference switchPreference = 57 (SwitchPreference) screen.findPreference(getPreferenceKey()); 58 59 mNfcEnabler = new NfcEnabler(mContext, switchPreference); 60 61 // Manually set dependencies for NFC when not toggleable. 62 if (!isToggleableInAirplaneMode(mContext)) { 63 mAirplaneModeObserver = new NfcAirplaneModeObserver(mContext, 64 mNfcAdapter, (Preference) switchPreference); 65 } 66 } 67 68 @Override isChecked()69 public boolean isChecked() { 70 return mNfcAdapter.isEnabled(); 71 } 72 73 @Override setChecked(boolean isChecked)74 public boolean setChecked(boolean isChecked) { 75 if (isChecked) { 76 mNfcAdapter.enable(); 77 } else { 78 mNfcAdapter.disable(); 79 } 80 return true; 81 } 82 83 @Override 84 @AvailabilityStatus getAvailabilityStatus()85 public int getAvailabilityStatus() { 86 return mNfcAdapter != null 87 ? AVAILABLE 88 : UNSUPPORTED_ON_DEVICE; 89 } 90 91 @Override getIntentFilter()92 public IntentFilter getIntentFilter() { 93 final IntentFilter filter = new IntentFilter(); 94 filter.addAction(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED); 95 filter.addAction(NfcAdapter.EXTRA_ADAPTER_STATE); 96 return filter; 97 } 98 99 @Override hasAsyncUpdate()100 public boolean hasAsyncUpdate() { 101 return true; 102 } 103 104 @Override isSliceable()105 public boolean isSliceable() { 106 return TextUtils.equals(getPreferenceKey(), KEY_TOGGLE_NFC); 107 } 108 109 @Override onResume()110 public void onResume() { 111 if (mAirplaneModeObserver != null) { 112 mAirplaneModeObserver.register(); 113 } 114 if (mNfcEnabler != null) { 115 mNfcEnabler.resume(); 116 } 117 } 118 119 @Override onPause()120 public void onPause() { 121 if (mAirplaneModeObserver != null) { 122 mAirplaneModeObserver.unregister(); 123 } 124 if (mNfcEnabler != null) { 125 mNfcEnabler.pause(); 126 } 127 } 128 isToggleableInAirplaneMode(Context context)129 public static boolean isToggleableInAirplaneMode(Context context) { 130 final String toggleable = Settings.Global.getString(context.getContentResolver(), 131 Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS); 132 return toggleable != null && toggleable.contains(Settings.Global.RADIO_NFC); 133 } 134 } 135