1 /* 2 * Copyright (C) 2018 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.database.ContentObserver; 20 import android.net.Uri; 21 import android.nfc.NfcAdapter; 22 import android.os.Handler; 23 import android.os.Looper; 24 import android.provider.Settings; 25 import android.support.annotation.VisibleForTesting; 26 import android.support.v7.preference.Preference; 27 28 /** 29 * NfcAirplaneModeObserver is a helper to manage the Nfc on/off when airplane mode status 30 * is changed. 31 */ 32 public class NfcAirplaneModeObserver extends ContentObserver { 33 34 private final Context mContext; 35 private final NfcAdapter mNfcAdapter; 36 private final Preference mPreference; 37 private int mAirplaneMode; 38 39 @VisibleForTesting 40 final static Uri AIRPLANE_MODE_URI = 41 Settings.Global.getUriFor(Settings.Global.AIRPLANE_MODE_ON); 42 NfcAirplaneModeObserver(Context context, NfcAdapter nfcAdapter, Preference preference)43 public NfcAirplaneModeObserver(Context context, NfcAdapter nfcAdapter, Preference preference) { 44 super(new Handler(Looper.getMainLooper())); 45 mContext = context; 46 mNfcAdapter = nfcAdapter; 47 mPreference = preference; 48 updateNfcPreference(); 49 } 50 register()51 public void register() { 52 mContext.getContentResolver().registerContentObserver(AIRPLANE_MODE_URI, false, this); 53 } 54 unregister()55 public void unregister() { 56 mContext.getContentResolver().unregisterContentObserver(this); 57 } 58 59 @Override onChange(boolean selfChange, Uri uri)60 public void onChange(boolean selfChange, Uri uri) { 61 super.onChange(selfChange, uri); 62 updateNfcPreference(); 63 } 64 updateNfcPreference()65 private void updateNfcPreference() { 66 final int airplaneMode = Settings.Global.getInt( 67 mContext.getContentResolver(), Settings.Global.AIRPLANE_MODE_ON, mAirplaneMode); 68 if (airplaneMode == mAirplaneMode) { 69 return; 70 } 71 72 mAirplaneMode = airplaneMode; 73 boolean toggleable = mAirplaneMode != 1; 74 if (toggleable) { 75 mNfcAdapter.enable(); 76 } else { 77 mNfcAdapter.disable(); 78 } 79 mPreference.setEnabled(toggleable); 80 } 81 } 82