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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 com.android.settings.R;
import android.content.Context;
import android.nfc.NfcAdapter;
import android.preference.Preference;
import android.preference.CheckBoxPreference;
import android.provider.Settings;
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 boolean mNfcState;
public NfcEnabler(Context context, CheckBoxPreference checkBoxPreference) {
mContext = context;
mCheckbox = checkBoxPreference;
mNfcAdapter = NfcAdapter.getDefaultAdapter();
if (mNfcAdapter == null) {
// NFC is not supported
mCheckbox.setEnabled(false);
}
}
public void resume() {
if (mNfcAdapter == null) {
return;
}
mCheckbox.setOnPreferenceChangeListener(this);
mNfcState = Settings.System.getInt(mContext.getContentResolver(),
Settings.System.NFC_ON, 0) != 0;
updateUi();
}
public void pause() {
if (mNfcAdapter == null) {
return;
}
mCheckbox.setOnPreferenceChangeListener(null);
}
public boolean onPreferenceChange(Preference preference, Object value) {
// Turn on/off Nfc
mNfcState = (Boolean) value;
setEnabled();
return false;
}
private void setEnabled() {
if (mNfcState) {
if (!mNfcAdapter.enableTagDiscovery()) {
Log.w(TAG, "NFC enabling failed");
mNfcState = false;
}
} else {
if (!mNfcAdapter.disableTagDiscovery()) {
Log.w(TAG, "NFC disabling failed");
mNfcState = true;
}
}
updateUi();
}
private void updateUi() {
mCheckbox.setChecked(mNfcState);
}
}
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