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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.Handler;
import android.preference.CheckBoxPreference;
import android.preference.Preference;
import android.util.Log;
/**
* 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 static final String TAG = "NfcEnabler";
private final Context mContext;
private final CheckBoxPreference mCheckbox;
private final NfcAdapter mNfcAdapter;
private final IntentFilter mIntentFilter;
private final Handler mHandler = new Handler();
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (NfcAdapter.ACTION_ADAPTER_STATE_CHANGE.equals(action)) {
handleNfcStateChanged(intent.getBooleanExtra(
NfcAdapter.EXTRA_NEW_BOOLEAN_STATE,
false));
}
}
};
private boolean mNfcState;
public NfcEnabler(Context context, CheckBoxPreference checkBoxPreference) {
mContext = context;
mCheckbox = checkBoxPreference;
mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
if (mNfcAdapter == null) {
// NFC is not supported
mCheckbox.setEnabled(false);
}
mIntentFilter = new IntentFilter(NfcAdapter.ACTION_ADAPTER_STATE_CHANGE);
}
public void resume() {
if (mNfcAdapter == null) {
return;
}
mContext.registerReceiver(mReceiver, mIntentFilter);
mCheckbox.setOnPreferenceChangeListener(this);
mNfcState = mNfcAdapter.isEnabled();
mCheckbox.setChecked(mNfcState);
}
public void pause() {
if (mNfcAdapter == null) {
return;
}
mContext.unregisterReceiver(mReceiver);
mCheckbox.setOnPreferenceChangeListener(null);
}
public boolean onPreferenceChange(Preference preference, Object value) {
// Turn NFC on/off
final boolean desiredState = (Boolean) value;
mCheckbox.setEnabled(false);
// Start async update of the NFC adapter state, as the API is
// unfortunately blocking...
new Thread("toggleNFC") {
@Override
public void run() {
Log.d(TAG, "Setting NFC enabled state to: " + desiredState);
boolean success = false;
if (desiredState) {
success = mNfcAdapter.enable();
} else {
success = mNfcAdapter.disable();
}
if (success) {
Log.d(TAG, "Successfully changed NFC enabled state to " + desiredState);
mHandler.post(new Runnable() {
public void run() {
handleNfcStateChanged(desiredState);
}
});
} else {
Log.w(TAG, "Error setting NFC enabled state to " + desiredState);
mHandler.post(new Runnable() {
public void run() {
mCheckbox.setEnabled(true);
}
});
}
}
}.start();
return false;
}
private void handleNfcStateChanged(boolean newState) {
mCheckbox.setChecked(newState);
mCheckbox.setEnabled(true);
}
}
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