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      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.nfc.NfcAdapter;
     20 import android.support.v7.preference.Preference;
     21 import android.support.v7.preference.PreferenceScreen;
     22 
     23 import com.android.settings.core.BasePreferenceController;
     24 import com.android.settingslib.RestrictedPreference;
     25 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     26 import com.android.settingslib.core.lifecycle.events.OnPause;
     27 import com.android.settingslib.core.lifecycle.events.OnResume;
     28 
     29 import java.util.List;
     30 
     31 public class AndroidBeamPreferenceController extends BasePreferenceController
     32         implements LifecycleObserver, OnResume, OnPause {
     33 
     34     public static final String KEY_ANDROID_BEAM_SETTINGS = "android_beam_settings";
     35     private final NfcAdapter mNfcAdapter;
     36     private AndroidBeamEnabler mAndroidBeamEnabler;
     37     private NfcAirplaneModeObserver mAirplaneModeObserver;
     38 
     39     public AndroidBeamPreferenceController(Context context, String key) {
     40         super(context, key);
     41         mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
     42     }
     43 
     44     @Override
     45     public void displayPreference(PreferenceScreen screen) {
     46         super.displayPreference(screen);
     47         if (!isAvailable()) {
     48             mAndroidBeamEnabler = null;
     49             return;
     50         }
     51 
     52         final RestrictedPreference restrictedPreference =
     53                 (RestrictedPreference) screen.findPreference(getPreferenceKey());
     54         mAndroidBeamEnabler = new AndroidBeamEnabler(mContext, restrictedPreference);
     55 
     56         // Manually set dependencies for NFC when not toggleable.
     57         if (!NfcPreferenceController.isToggleableInAirplaneMode(mContext)) {
     58             mAirplaneModeObserver = new NfcAirplaneModeObserver(mContext, mNfcAdapter,
     59                     (Preference) restrictedPreference);
     60         }
     61     }
     62 
     63     @Override
     64     @AvailabilityStatus
     65     public int getAvailabilityStatus() {
     66         return mNfcAdapter != null
     67                 ? AVAILABLE
     68                 : UNSUPPORTED_ON_DEVICE;
     69     }
     70 
     71     @Override
     72     public void onResume() {
     73         if (mAirplaneModeObserver != null) {
     74             mAirplaneModeObserver.register();
     75         }
     76         if (mAndroidBeamEnabler != null) {
     77             mAndroidBeamEnabler.resume();
     78         }
     79     }
     80 
     81     @Override
     82     public void onPause() {
     83         if (mAirplaneModeObserver != null) {
     84             mAirplaneModeObserver.unregister();
     85         }
     86         if (mAndroidBeamEnabler != null) {
     87             mAndroidBeamEnabler.pause();
     88         }
     89     }
     90 }
     91