Zero-click sharing for Browser using NFC.

This adds zero-click sharing for the Browser app; the URL of the
tab currently displayed will be transferred to any NFC-capable
Android phone upon touch.

Change-Id: I7aabc1b2b3f7700c05223349e5c317534fcfe8f0

1 files changed, 73 insertions, 0 deletions

diff --git a/src/com/android/browser/NfcHandler.java b/src/com/android/browser/NfcHandler.java
new file mode 100644
index 0000000..bdfe25e
--- /dev/null
+++ b/src/com/android/browser/NfcHandler.java
@@ -0,0 +1,73 @@
+/*
+ * 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;
+
+/** 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;
+
+    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() {
+        Tab currentTab = mController.getCurrentTab();
+        if (currentTab == null) {
+            return null;
+        }
+        String currentUrl = currentTab.getUrl();
+        if (currentUrl != null && currentTab.getWebView() != null &&
+                    !currentTab.getWebView().isPrivateBrowsingEnabled()) {
+            NdefRecord record = new NdefRecord(NdefRecord.TNF_ABSOLUTE_URI,
+                    NdefRecord.RTD_URI, new byte[] {}, currentUrl.getBytes());
+            NdefMessage msg = new NdefMessage(new NdefRecord[] { record });
+            return msg;
+        } else {
+            return null;
+        }
+    }
+
+    @Override
+    public void onMessagePushed() {
+    }
+}