How to read and write Android NFC tags?

Question

I followed some tutorial using the adam rocker source code for my NFCTest. I want to be able to read and write NFC tags and also launch an application.

Answer 1

Put these in your manifest :

Then to read NFC put this part in your activity:

at the end add go forward like my Activity :

import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.AnimationDrawable;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.Ndef;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.balysv.materialripple.MaterialRippleLayout;
import com.blogspot.android_er.androidnfctagdiscovered.R;
import com.pixelcan.inkpageindicator.InkPageIndicator;

import hpbyp.ir.app.hojre.fragment.slider.SliderPagerAdapter;
import hpbyp.ir.app.hojre.utiles.G;
import uk.co.chrisjenx.calligraphy.CalligraphyContextWrapper;

/**
 * An {@link Activity} which handles a broadcast of a new tag that the device just discovered.
 */
public class ActivityLoadDataFromNFC extends AppCompatActivity {
    @Override
    protected void attachBaseContext(Context newBase) {
        super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_load_data_from_nfc);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mAdapter = NfcAdapter.getDefaultAdapter(this);
        if (mAdapter == null) {
            //nfc not support your device.
            return;
        }
        mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
                getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);

    }

    NfcAdapter mAdapter;
    PendingIntent mPendingIntent;

    @Override
    protected void onResume() {
        super.onResume();
        mAdapter.enableForegroundDispatch(this, mPendingIntent, null, null);

    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mAdapter != null) {
            mAdapter.disableForegroundDispatch(this);
        }
    }

    @Override
    protected void onNewIntent(Intent intent) {
        Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
        GetDataFromTag(tag, intent);

    }

    private void GetDataFromTag(Tag tag, Intent intent) {
        Ndef ndef = Ndef.get(tag);
        try {
            ndef.connect();
//            txtType.setText(ndef.getType().toString());
//            txtSize.setText(String.valueOf(ndef.getMaxSize()));
//            txtWrite.setText(ndef.isWritable() ? "True" : "False");
            Parcelable[] messages = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);

            if (messages != null) {
                NdefMessage[] ndefMessages = new NdefMessage[messages.length];
                for (int i = 0; i < messages.length; i++) {
                    ndefMessages[i] = (NdefMessage) messages[i];
                }
                NdefRecord record = ndefMessages[0].getRecords()[0];

                byte[] payload = record.getPayload();
                String text = new String(payload);
                Log.e("tag", "vahid" + text);
                ndef.close();

            }
        } catch (Exception e) {
            Toast.makeText(getApplicationContext(), "Cannot Read From Tag.", Toast.LENGTH_LONG).show();
        }
    }

}