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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.nfc.NfcEvent;
import android.os.Handler;
import android.os.Message;
import java.util.concurrent.CountDownLatch;
/** 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.CreateNdefMessageCallback {
static final int GET_PRIVATE_BROWSING_STATE_MSG = 100;
final Controller mController;
Tab mCurrentTab;
boolean mIsPrivate;
CountDownLatch mPrivateBrowsingSignal;
public static void register(Activity activity, Controller controller) {
NfcAdapter adapter = NfcAdapter.getDefaultAdapter(activity.getApplicationContext());
if (adapter == null) {
return; // NFC not available on this device
}
adapter.setNdefPushMessageCallback(new NfcHandler(controller), activity);
}
public NfcHandler(Controller controller) {
mController = controller;
}
final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == GET_PRIVATE_BROWSING_STATE_MSG) {
mIsPrivate = mCurrentTab.getWebView().isPrivateBrowsingEnabled();
mPrivateBrowsingSignal.countDown();
}
}
};
@Override
public NdefMessage createNdefMessage(NfcEvent event) {
mCurrentTab = mController.getCurrentTab();
if ((mCurrentTab != null) && (mCurrentTab.getWebView() != null)) {
// We can only read the WebView state on the UI thread, so post
// a message and wait.
mPrivateBrowsingSignal = new CountDownLatch(1);
mHandler.sendMessage(mHandler.obtainMessage(GET_PRIVATE_BROWSING_STATE_MSG));
try {
mPrivateBrowsingSignal.await();
} catch (InterruptedException e) {
return null;
}
}
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;
}
}
}
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