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I'm doing an NFC Application and was wondering if this scenario is possible: Say, I have 2 NFC tags and 2 activities in one project. NFC A is written to open up Activity A by writing MIME type in NFC A as application/com.example.hello In the project's manifest file, Activity A has this intent filter: <intent-filter> <action android:name="android.nfc.action.NDEF_DISCOVERED" /> <data android:mimeType="application/com.example.hello" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> So, this works perfectly fine. I'm going to add another NFC Tag, and another activity.

I'm trying to start a activity when my smartphone scans an NDEF message. This is my manifest: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.androidbeam" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="17" /> <uses-permission android:name="android.permission.NFC" /> <uses-feature android:name="android.hardware.nfc" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style

On Android, as soon as an NFC tag gets in proximity of the phone, the system delievers an intent to my application that contains an objects that allows me to read and write the NDEF message of this tag. Specifically, I can write to this tag as often as I want, while it's still in proxmity of the phone. The Java code below gives you an impression of what i mean: Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); Ndef ndef = Ndef.get(tag); ndef.writeNdefMessage(/* some NDEF data */); // first write ndef.writeNdefMessage(/* some NDEF data */); // second write // further writes ndef

As of Android 5.0.0 you can long tap on a WiFi connection and write that connection to a tag ("Write to NFC tag"). You can find the source for that operation here: WriteWifiConfigToNfcDialog.java . The relevant line that takes a WiFi connection and creates an NDEF payload appears to be here: String wpsNfcConfigurationToken = mWifiManager.getWpsNfcConfigurationToken(mAccessPoint.networkId); mWifiManager is an instance of WifiManager , however getWpsNfcConfigurationToken is not part of the API. By tracking down this method, we can find its commit here: Add calls for NFC WSC token creation which