react-native-nfc-module

A NFC Android native module to integrate react-native application

Only Manual Installation

Step 1 : First, install the library from npm

npm install --save react-native-nfc-module

Step 2, Link the native dependencies

Mostly automatic installation

react-native link react-native-nfc-module

Usage

1. import NFCScanner from 'react-native-nfc-module';

2. To check NFC availability

   NFCScanner.NFCavailability( (resp) => {
           if(resp.nfcAvailable == "yes" || resp.nfcAvailable == "no") {
               if(resp.nfcAvailable == "yes")
               this.setState({nfcOpen: true});
   
               this.requestPermission();
           }
       });

3. Listening for NFC events

   step #1

   import {DeviceEventEmitter} from 'react-native';

   step #2

   componentDidMount() {
       /*
       Register listener
       */
       DeviceEventEmitter.addListener('onScanned', this.onScanned);
          
       /*
           onload check if there is NFC data 
              
           Caution : For multi window apps, there might be an issue if you dont handle the onResume & onStart events
       */
       NFCScanner.getInitialID("sample");
   }
   
   componentWillUnmount() {
       /*
       Unregister Listener
       */
       DeviceEventEmitter.removeListener('onScanned', this.onScanned);
   }

Checklist

Check #1 : Android Manifest.xml NFC permission

```
<uses-permission android:name="android.permission.NFC" />
```

Check #2 : Register What types of NFC should be handled

```
<activity
        android:name=".MainActivity"
        ... >

        <intent-filter>
            <action android:name="android.nfc.action.TAG_DISCOVERED" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>

        <intent-filter>
            <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
            <category android:name="android.intent.category.DEFAULT"/>
            <data android:mimeType="application/vnd.com.touchon.user"/>
        </intent-filter>

        <intent-filter>
            <action android:name="android.nfc.action.TECH_DISCOVERED" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>

        <meta-data
            android:name="android.nfc.action.TECH_DISCOVERED"
            android:resource="@xml/nfc_tech_filter" />

    </activity>
    ```

Issues

Check #1

this step is not necessary if the android manifest file is added with following dependencies

check "react-native-nfc-module" project --> build.gradle

add following
    compile 'com.google.guava:guava:22.0-android'

should look like

dependencies {
    compile 'com.facebook.react:react-native:+'
    compile 'com.google.guava:guava:22.0-android'
}

else do this

Open Android studio and open android project you will see "react-native-nfc-module" module --> add "File dependency" in Module Settings --> choose "gauvalib.jar"