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 android.nfc; 18 19 import android.annotation.SystemService; 20 import android.compat.annotation.UnsupportedAppUsage; 21 import android.content.Context; 22 import android.os.Build; 23 24 /** 25 * High level manager used to obtain an instance of an {@link NfcAdapter}. 26 * <p> 27 * Use {@link android.content.Context#getSystemService(java.lang.String)} 28 * with {@link Context#NFC_SERVICE} to create an {@link NfcManager}, 29 * then call {@link #getDefaultAdapter} to obtain the {@link NfcAdapter}. 30 * <p> 31 * Alternately, you can just call the static helper 32 * {@link NfcAdapter#getDefaultAdapter(android.content.Context)}. 33 * 34 * <div class="special reference"> 35 * <h3>Developer Guides</h3> 36 * <p>For more information about using NFC, read the 37 * <a href="{@docRoot}guide/topics/nfc/index.html">Near Field Communication</a> developer guide.</p> 38 * </div> 39 * 40 * @see NfcAdapter#getDefaultAdapter(android.content.Context) 41 */ 42 @SystemService(Context.NFC_SERVICE) 43 public final class NfcManager { 44 private final NfcAdapter mAdapter; 45 46 /** 47 * @hide 48 */ 49 @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023) NfcManager(Context context)50 public NfcManager(Context context) { 51 NfcAdapter adapter; 52 context = context.getApplicationContext(); 53 if (context == null) { 54 throw new IllegalArgumentException( 55 "context not associated with any application (using a mock context?)"); 56 } 57 try { 58 adapter = NfcAdapter.getNfcAdapter(context); 59 } catch (UnsupportedOperationException e) { 60 adapter = null; 61 } 62 mAdapter = adapter; 63 } 64 65 /** 66 * Get the default NFC Adapter for this device. 67 * 68 * @return the default NFC Adapter 69 */ getDefaultAdapter()70 public NfcAdapter getDefaultAdapter() { 71 return mAdapter; 72 } 73 } 74