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/*
* Copyright (C) 2011 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.browser;
import android.app.Activity;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.os.AsyncTask;
/** This class implements sharing the URL of the currently
* shown browser page over NFC. Sharing is only active
* when the activity is in the foreground and resumed.
* Incognito tabs will not be shared over NFC.
*/
public class NfcHandler implements NfcAdapter.NdefPushCallback {
private NfcAdapter mNfcAdapter;
private Activity mActivity;
private Controller mController;
/** We need an async task to check whether the tab is private
* on the UI thread.
*/
private class CreateMessageTask extends AsyncTask<Void, Void, NdefMessage> {
private boolean mIsPrivate = false;
private Tab mCurrentTab;
@Override
protected void onPreExecute() {
mCurrentTab = mController.getCurrentTab();
if ((mCurrentTab != null) && (mCurrentTab.getWebView() != null)) {
mIsPrivate = mCurrentTab.getWebView().isPrivateBrowsingEnabled();
}
}
@Override
protected NdefMessage doInBackground(Void... params) {
if ((mCurrentTab == null) || mIsPrivate) {
return null;
}
String currentUrl = mCurrentTab.getUrl();
if (currentUrl != null) {
NdefRecord record = NdefRecord.createUri(currentUrl);
NdefMessage msg = new NdefMessage(new NdefRecord[] { record });
return msg;
} else {
return null;
}
}
}
public NfcHandler(Activity browser, Controller controller) {
mActivity = browser;
mController = controller;
mNfcAdapter = NfcAdapter.getDefaultAdapter(mActivity);
}
void onPause() {
if (mNfcAdapter != null) {
mNfcAdapter.disableForegroundNdefPush(mActivity);
}
}
void onResume() {
if (mNfcAdapter != null) {
mNfcAdapter.enableForegroundNdefPush(mActivity, this);
}
}
@Override
public NdefMessage createMessage() {
CreateMessageTask task = new CreateMessageTask();
task.execute();
try {
return task.get();
} catch (Exception e) {
return null;
}
}
@Override
public void onMessagePushed() {
}
}
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