Send identity destinations to other devices via NFC

TODO

@@ -16,7 +16,6 @@ Features:
 - Public address book lookup
 - Import/export identities
 - Export Destination / make it copyable
--- NFC
 -- SMS / message
 - Add optional CC: and BCC: fields
 - "Empty trash" option in Trash folder

app/src/main/java/i2p/bote/android/config/ViewIdentityActivity.java

@@ -1,11 +1,19 @@
 package i2p.bote.android.config;
 
+import android.annotation.SuppressLint;
+import android.nfc.NdefMessage;
+import android.nfc.NfcAdapter;
+import android.nfc.NfcEvent;
+import android.os.Build;
 import android.os.Bundle;
 import android.support.v7.app.ActionBarActivity;
 
 import i2p.bote.android.InitActivities;
 
 public class ViewIdentityActivity extends ActionBarActivity {
+    NfcAdapter mNfcAdapter;
+
+    @SuppressLint("NewApi")
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -26,5 +34,35 @@ public class ViewIdentityActivity extends ActionBarActivity {
             getSupportFragmentManager().beginTransaction()
                 .add(android.R.id.content, f).commit();
         }
+
+        // NFC send only works on API 10+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD_MR1) {
+            mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
+            if (mNfcAdapter != null &&
+                    Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH)
+                mNfcAdapter.setNdefPushMessageCallback(new NfcAdapter.CreateNdefMessageCallback() {
+                    @Override
+                    public NdefMessage createNdefMessage(NfcEvent nfcEvent) {
+                        return getNdefMessage();
+                    }
+                }, this);
+        }
+    }
+
+    @SuppressLint("NewApi")
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        if (mNfcAdapter != null &&
+                Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
+            mNfcAdapter.enableForegroundNdefPush(this, getNdefMessage());
+        }
+    }
+
+    private NdefMessage getNdefMessage() {
+        ViewIdentityFragment f = (ViewIdentityFragment) getSupportFragmentManager()
+                .findFragmentById(android.R.id.content);
+        return f.createNdefMessage();
     }
 }

app/src/main/java/i2p/bote/android/config/ViewIdentityFragment.java

@@ -13,6 +13,9 @@ import android.app.Dialog;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.graphics.Bitmap;
+import android.nfc.NdefMessage;
+import android.nfc.NdefRecord;
+import android.os.Build;
 import android.os.Bundle;
 import android.support.v4.app.DialogFragment;
 import android.support.v4.app.Fragment;
@@ -153,4 +156,40 @@ public class ViewIdentityFragment extends Fragment {
             return super.onOptionsItemSelected(item);
         }
     }
+
+    public NdefMessage createNdefMessage() {
+        NdefMessage msg = new NdefMessage(new NdefRecord[]{
+                createNameRecord(),
+                createDestinationRecord()
+        });
+        return msg;
+    }
+
+    private NdefRecord createNameRecord() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN)
+            return new NdefRecord(
+                    NdefRecord.TNF_EXTERNAL_TYPE,
+                    "i2p.bote:contact".getBytes(),
+                    new byte[0],
+                    mIdentity.getPublicName().getBytes()
+            );
+        else
+            return NdefRecord.createExternal(
+                    "i2p.bote", "contact", mIdentity.getPublicName().getBytes()
+            );
+    }
+
+    private NdefRecord createDestinationRecord() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN)
+            return new NdefRecord(
+                    NdefRecord.TNF_EXTERNAL_TYPE,
+                    "i2p.bote:contactDestination".getBytes(),
+                    new byte[0],
+                    mIdentity.getKey().getBytes()
+            );
+        else
+            return NdefRecord.createExternal(
+                    "i2p.bote", "contactDestination", mIdentity.getKey().getBytes()
+            );
+    }
 }