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/*
* Copyright (C) 2010 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.nfc.NfcAdapter;
import android.os.UserManager;
import android.preference.Preference;
import android.preference.PreferenceScreen;
import android.preference.SwitchPreference;
import com.android.settings.R;
/**
* NfcEnabler is a helper to manage the Nfc on/off checkbox preference. It is
* turns on/off Nfc and ensures the summary of the preference reflects the
* current state.
*/
public class NfcEnabler implements Preference.OnPreferenceChangeListener {
private final Context mContext;
private final SwitchPreference mSwitch;
private final PreferenceScreen mAndroidBeam;
private final PreferenceScreen mNfcPayment;
private final NfcAdapter mNfcAdapter;
private final IntentFilter mIntentFilter;
private boolean mBeamDisallowed;
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (NfcAdapter.ACTION_ADAPTER_STATE_CHANGED.equals(action)) {
handleNfcStateChanged(intent.getIntExtra(NfcAdapter.EXTRA_ADAPTER_STATE,
NfcAdapter.STATE_OFF));
}
}
};
public NfcEnabler(Context context, SwitchPreference switchPreference,
PreferenceScreen androidBeam, PreferenceScreen nfcPayment) {
mContext = context;
mSwitch = switchPreference;
mAndroidBeam = androidBeam;
mNfcPayment = nfcPayment;
mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
mBeamDisallowed = ((UserManager) mContext.getSystemService(Context.USER_SERVICE))
.hasUserRestriction(UserManager.DISALLOW_OUTGOING_BEAM);
if (mNfcAdapter == null) {
// NFC is not supported
mSwitch.setEnabled(false);
mAndroidBeam.setEnabled(false);
mNfcPayment.setEnabled(false);
mIntentFilter = null;
return;
}
if (mBeamDisallowed) {
mAndroidBeam.setEnabled(false);
}
mIntentFilter = new IntentFilter(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED);
}
public void resume() {
if (mNfcAdapter == null) {
return;
}
handleNfcStateChanged(mNfcAdapter.getAdapterState());
mContext.registerReceiver(mReceiver, mIntentFilter);
mSwitch.setOnPreferenceChangeListener(this);
}
public void pause() {
if (mNfcAdapter == null) {
return;
}
mContext.unregisterReceiver(mReceiver);
mSwitch.setOnPreferenceChangeListener(null);
}
public boolean onPreferenceChange(Preference preference, Object value) {
// Turn NFC on/off
final boolean desiredState = (Boolean) value;
mSwitch.setEnabled(false);
if (desiredState) {
mNfcAdapter.enable();
} else {
mNfcAdapter.disable();
}
return false;
}
private void handleNfcStateChanged(int newState) {
switch (newState) {
case NfcAdapter.STATE_OFF:
mSwitch.setChecked(false);
mSwitch.setEnabled(true);
mAndroidBeam.setEnabled(false);
mAndroidBeam.setSummary(R.string.android_beam_disabled_summary);
mNfcPayment.setEnabled(false);
break;
case NfcAdapter.STATE_ON:
mSwitch.setChecked(true);
mSwitch.setEnabled(true);
mAndroidBeam.setEnabled(!mBeamDisallowed);
if (mNfcAdapter.isNdefPushEnabled() && !mBeamDisallowed) {
mAndroidBeam.setSummary(R.string.android_beam_on_summary);
} else {
mAndroidBeam.setSummary(R.string.android_beam_off_summary);
}
mNfcPayment.setEnabled(true);
break;
case NfcAdapter.STATE_TURNING_ON:
mSwitch.setChecked(true);
mSwitch.setEnabled(false);
mAndroidBeam.setEnabled(false);
mNfcPayment.setEnabled(false);
break;
case NfcAdapter.STATE_TURNING_OFF:
mSwitch.setChecked(false);
mSwitch.setEnabled(false);
mAndroidBeam.setEnabled(false);
mNfcPayment.setEnabled(false);
break;
}
}
}
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