Android NFC read MifareClassic RFID tag with android nfc action TECH DISCOVERED

This example show using intent-filter of "android.nfc.action.TECH_DISCOVERED", specify target tech of android.nfc.tech.MifareClassic, and read basic info my MifareClassic RFID tag.


Edit AndroidManifest.xml, to specify <uses-permission> of "android.permission.NFC", and <uses-feature> of "android.hardware.nfc".
Add <intent-filter>> of "android.nfc.action.TECH_DISCOVERED", and <meta-data> for "@xml/nfc_tech_filter".

<?xml version="1.0" encoding="utf-8"?>
<manifest 
 package="com.blogspot.android_er.androidnfctechdiscovered" >

 <uses-permission android_name="android.permission.NFC"/>
 <uses-feature android_name="android.hardware.nfc"
 android_required="true"/>

 <application
 android_allowBackup="true"
 android_icon="@mipmap/ic_launcher"
 android_label="@string/app_name"
 android_supportsRtl="true"
 android_theme="@style/AppTheme" >
 <activity android_name=".MainActivity" >
 <intent-filter>
 <action android_name="android.intent.action.MAIN" />
 <category android_name="android.intent.category.LAUNCHER" />
 </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>
 </application>

</manifest>

Create xml/nfc_tech_filter.xml. In order to make it simple, we specify one tech only, android.nfc.tech.MifareClassic.

<resources >
<tech-list>
 <tech>android.nfc.tech.MifareClassic</tech>
</tech-list>
</resources>

MainActivity.java

package com.blogspot.android_er.androidnfctechdiscovered;

import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

 private NfcAdapter nfcAdapter;
 TextView textViewInfo, textViewTagInfo;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 textViewInfo = (TextView)findViewById(R.id.info);
 textViewTagInfo = (TextView)findViewById(R.id.taginfo);

 nfcAdapter = NfcAdapter.getDefaultAdapter(this);
 if(nfcAdapter == null){
 Toast.makeText(this,
 "NFC NOT supported on this devices!",
 Toast.LENGTH_LONG).show();
 finish();
 }else if(!nfcAdapter.isEnabled()){
 Toast.makeText(this,
 "NFC NOT Enabled!",
 Toast.LENGTH_LONG).show();
 finish();
 }
 }

 @Override
 protected void onResume() {
 super.onResume();

 Intent intent = getIntent();
 String action = intent.getAction();

 if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)) {
 Toast.makeText(this,
 "onResume() - ACTION_TECH_DISCOVERED",
 Toast.LENGTH_SHORT).show();

 Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
 if(tag == null){
 textViewInfo.setText("tag == null");
 }else{
 String tagInfo = tag.toString() + " ";

 tagInfo += " Tag Id: ";
 byte[] tagId = tag.getId();
 tagInfo += "length = " + tagId.length +" ";
 for(int i=0; i<tagId.length; i++){
 tagInfo += Integer.toHexString(tagId[i] & 0xFF) + " ";
 }
 tagInfo += " ";

 String[] techList = tag.getTechList();
 tagInfo += " Tech List ";
 tagInfo += "length = " + techList.length +" ";
 for(int i=0; i<techList.length; i++){
 tagInfo += techList[i] + " ";
 }

 textViewInfo.setText(tagInfo);

 //Only android.nfc.tech.MifareClassic specified in nfc_tech_filter.xml,
 //so must be MifareClassic
 readMifareClassic(tag);
 }
 }else{
 Toast.makeText(this,
 "onResume() : " + action,
 Toast.LENGTH_SHORT).show();
 }
 }

 public void readMifareClassic(Tag tag){
 MifareClassic mifareClassicTag = MifareClassic.get(tag);

 String typeInfoString = "--- MifareClassic tag --- ";
 int type = mifareClassicTag.getType();
 switch(type){
 case MifareClassic.TYPE_PLUS:
 typeInfoString += "MifareClassic.TYPE_PLUS ";
 break;
 case MifareClassic.TYPE_PRO:
 typeInfoString += "MifareClassic.TYPE_PRO ";
 break;
 case MifareClassic.TYPE_CLASSIC:
 typeInfoString += "MifareClassic.TYPE_CLASSIC ";
 break;
 case MifareClassic.TYPE_UNKNOWN:
 typeInfoString += "MifareClassic.TYPE_UNKNOWN ";
 break;
 default:
 typeInfoString += "unknown...! ";
 }

 int size = mifareClassicTag.getSize();
 switch(size){
 case MifareClassic.SIZE_1K:
 typeInfoString += "MifareClassic.SIZE_1K ";
 break;
 case MifareClassic.SIZE_2K:
 typeInfoString += "MifareClassic.SIZE_2K ";
 break;
 case MifareClassic.SIZE_4K:
 typeInfoString += "MifareClassic.SIZE_4K ";
 break;
 case MifareClassic.SIZE_MINI:
 typeInfoString += "MifareClassic.SIZE_MINI ";
 break;
 default:
 typeInfoString += "unknown size...! ";
 }

 int blockCount = mifareClassicTag.getBlockCount();
 typeInfoString += "BlockCount = " + blockCount + " ";
 int sectorCount = mifareClassicTag.getSectorCount();
 typeInfoString += "SectorCount = " + sectorCount + " ";

 textViewTagInfo.setText(typeInfoString);
 }
}

layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 
 
 android_layout_width="match_parent"
 android_layout_height="match_parent"
 android_padding="16dp"
 android_orientation="vertical"
 tools_context=".MainActivity">

 <TextView
 android_layout_width="wrap_content"
 android_layout_height="wrap_content"
 android_layout_margin="10dp"
 android_layout_gravity="center_horizontal"
 android_autoLink="web"
 android_text="http://android-er.blogspot.com/"
 android_textStyle="bold"/>

 <TextView
 android_id="@+id/info"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_textStyle="italic"/>

 <TextView
 android_id="@+id/taginfo"
 android_layout_width="match_parent"
 android_layout_height="wrap_content"
 android_textStyle="bold"/>

</LinearLayout>

Reference:
- http://developer.android.com/guide/topics/connectivity/nfc/nfc.html
- http://developer.android.com/guide/topics/connectivity/nfc/advanced-nfc.html
- http://developer.android.com/reference/android/nfc/tech/MifareClassic.html

Next:
- Android NFC: readBlock() for MifareClassic, to dump data in RFID tag

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