78 lines
2.4 KiB
Java
78 lines
2.4 KiB
Java
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings.nfc;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.nfc.NfcAdapter;
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/**
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* BaseNfcEnabler is a abstract helper to manage the Nfc state for Nfc and Android Beam
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* preference. It will receive intent and update state to ensure preference show correct state.
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*/
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public abstract class BaseNfcEnabler {
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protected final Context mContext;
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protected final NfcAdapter mNfcAdapter;
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private final IntentFilter mIntentFilter;
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private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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String action = intent.getAction();
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if (NfcAdapter.ACTION_ADAPTER_STATE_CHANGED.equals(action)) {
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handleNfcStateChanged(intent.getIntExtra(NfcAdapter.EXTRA_ADAPTER_STATE,
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NfcAdapter.STATE_OFF));
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}
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}
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};
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public BaseNfcEnabler(Context context) {
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mContext = context;
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mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
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if (!isNfcAvailable()) {
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// NFC is not supported
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mIntentFilter = null;
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return;
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}
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mIntentFilter = new IntentFilter(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED);
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}
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public void resume() {
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if (!isNfcAvailable()) {
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return;
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}
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handleNfcStateChanged(mNfcAdapter.getAdapterState());
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mContext.registerReceiver(mReceiver, mIntentFilter);
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}
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public void pause() {
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if (!isNfcAvailable()) {
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return;
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}
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mContext.unregisterReceiver(mReceiver);
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}
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public boolean isNfcAvailable() {
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return mNfcAdapter != null;
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}
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protected abstract void handleNfcStateChanged(int newState);
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}
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