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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.nfc;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.nfc.NfcAdapter;
import android.provider.Settings;
import android.util.Log;
import android.widget.Switch;
import androidx.preference.PreferenceScreen;
import com.android.settings.core.TogglePreferenceController;
import com.android.settings.slices.SliceBackgroundWorker;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnPause;
import com.android.settingslib.core.lifecycle.events.OnResume;
import com.android.settingslib.widget.MainSwitchPreference;
import com.android.settingslib.widget.OnMainSwitchChangeListener;
import java.io.IOException;
public class NfcPreferenceController extends TogglePreferenceController
implements LifecycleObserver, OnResume, OnPause, OnMainSwitchChangeListener {
public static final String KEY_TOGGLE_NFC = "toggle_nfc";
private final NfcAdapter mNfcAdapter;
private NfcEnabler mNfcEnabler;
private MainSwitchPreference mPreference;
public NfcPreferenceController(Context context, String key) {
super(context, key);
mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
}
@Override
public void displayPreference(PreferenceScreen screen) {
super.displayPreference(screen);
if (!isAvailable()) {
mNfcEnabler = null;
return;
}
mPreference = (MainSwitchPreference) screen.findPreference(getPreferenceKey());
mPreference.addOnSwitchChangeListener(this);
mNfcEnabler = new NfcEnabler(mContext, mPreference);
}
@Override
public void onSwitchChanged(Switch switchView, boolean isChecked) {
if (isChecked != mNfcAdapter.isEnabled()) {
setChecked(isChecked);
}
}
@Override
public boolean isChecked() {
return mNfcAdapter.isEnabled();
}
@Override
public boolean setChecked(boolean isChecked) {
if (isChecked) {
mNfcAdapter.enable();
} else {
mNfcAdapter.disable();
}
return true;
}
@Override
@AvailabilityStatus
public int getAvailabilityStatus() {
return mNfcAdapter != null
? AVAILABLE
: UNSUPPORTED_ON_DEVICE;
}
@Override
public boolean hasAsyncUpdate() {
return true;
}
@Override
public boolean isPublicSlice() {
return true;
}
@Override
public Class<? extends SliceBackgroundWorker> getBackgroundWorkerClass() {
return NfcSliceWorker.class;
}
@Override
public void onResume() {
if (mNfcEnabler != null) {
mNfcEnabler.resume();
}
}
@Override
public void onPause() {
if (mNfcEnabler != null) {
mNfcEnabler.pause();
}
}
public static boolean shouldTurnOffNFCInAirplaneMode(Context context) {
final String airplaneModeRadios = Settings.Global.getString(context.getContentResolver(),
Settings.Global.AIRPLANE_MODE_RADIOS);
return airplaneModeRadios != null && airplaneModeRadios.contains(Settings.Global.RADIO_NFC);
}
public static boolean isToggleableInAirplaneMode(Context context) {
final String toggleable = Settings.Global.getString(context.getContentResolver(),
Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
return toggleable != null && toggleable.contains(Settings.Global.RADIO_NFC);
}
/**
* Listener for background changes to NFC.
*
* <p>
* Listen to broadcasts from {@link NfcAdapter}. The worker will call notify changed on the
* NFC Slice only when the following extras are present in the broadcast:
* <ul>
* <li>{@link NfcAdapter#STATE_ON}</li>
* <li>{@link NfcAdapter#STATE_OFF}</li>
* </ul>
*/
public static class NfcSliceWorker extends SliceBackgroundWorker<Void> {
private static final String TAG = "NfcSliceWorker";
private static final IntentFilter NFC_FILTER =
new IntentFilter(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED);
private NfcUpdateReceiver mUpdateObserver;
public NfcSliceWorker(Context context, Uri uri) {
super(context, uri);
mUpdateObserver = new NfcUpdateReceiver(this);
}
@Override
protected void onSlicePinned() {
getContext().registerReceiver(mUpdateObserver, NFC_FILTER);
}
@Override
protected void onSliceUnpinned() {
getContext().unregisterReceiver(mUpdateObserver);
}
@Override
public void close() throws IOException {
mUpdateObserver = null;
}
public void updateSlice() {
notifySliceChange();
}
public class NfcUpdateReceiver extends BroadcastReceiver {
private final int NO_EXTRA = -1;
private final NfcSliceWorker mSliceBackgroundWorker;
public NfcUpdateReceiver(NfcSliceWorker sliceWorker) {
mSliceBackgroundWorker = sliceWorker;
}
@Override
public void onReceive(Context context, Intent intent) {
final int nfcStateExtra = intent.getIntExtra(NfcAdapter.EXTRA_ADAPTER_STATE,
NO_EXTRA);
// Do nothing if state change is empty, or an intermediate step.
if ((nfcStateExtra == NO_EXTRA)
|| (nfcStateExtra == NfcAdapter.STATE_TURNING_ON)
|| (nfcStateExtra == NfcAdapter.STATE_TURNING_OFF)) {
Log.d(TAG, "Transitional update, dropping broadcast");
return;
}
Log.d(TAG, "Nfc broadcast received, updating Slice.");
mSliceBackgroundWorker.updateSlice();
}
}
}
}
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