ForegroundDispatch.java

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/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.github.rosjava.android_remocons.robot_remocon.nfc;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.tech.*;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.Log;
import android.widget.TextView;

import com.github.rosjava.android_remocons.robot_remocon.R;

public class ForegroundDispatch extends Activity {
    private NfcAdapter mAdapter;
    private PendingIntent mPendingIntent;
    private IntentFilter[] mFilters;
    private String[][] mTechLists;
    private TextView mText;
    private int mCount = 0;
    private String tag_data = null;

    @Override
    public void onCreate(Bundle savedState) {
        super.onCreate(savedState);

        setContentView(R.layout.nfc_tag_scan);
        mText = (TextView) findViewById(R.id.text);
        mText.setText("Scan a NFC tag");

        mAdapter = NfcAdapter.getDefaultAdapter(this);

        // Create a generic PendingIntent that will be deliver to this activity. The NFC stack
        // will fill in the intent with the details of the discovered tag before delivering to
        // this activity.
        mPendingIntent = PendingIntent.getActivity(this, 0,
                new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);

        // Setup an intent filter for all MIME based dispatches
        IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
        try {
            ndef.addDataType("text/plain");
        } catch (MalformedMimeTypeException e) {
            throw new RuntimeException("fail", e);
        }
        mFilters = new IntentFilter[] {
                ndef,
        };

        // Setup a tech list for all NfcF tags
        mTechLists = new String[][] { new String[] { NfcF.class.getName() },
                                      new String[] { NfcA.class.getName(), MifareClassic.class.getName() },
                                      new String[] { NfcA.class.getName(), MifareUltralight.class.getName() } };
    }

    @Override
    public void onResume() {
        super.onResume();
        if (mAdapter != null) mAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters,
                mTechLists);
    }

    @Override
    public void onNewIntent(Intent intent) {
        Log.i("Foreground dispatch", "Discovered tag with intent: " + intent);
        mText.setText("Discovered tag " + ++mCount + " with intent: " + intent);

        if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
            Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
            if ((rawMsgs != null) && (rawMsgs.length > 0)) {
                NdefMessage msg = (NdefMessage) rawMsgs[0];
                NdefRecord[] records = msg.getRecords();
                if ((records != null) && (records.length > 0)) {
                    String payload = new String(records[0].getPayload());
                    tag_data = payload.substring(3);  // Remove data type (1 byte) and language code (2 bytes)
                    mText.append("\n\n\n" + tag_data);
                    finish();  // TODO add ok/cancel buttons instead
                }
            }

//            if (payload2[0] != NdefRecord.TNF_MIME_MEDIA)
        }

        mText.setText("Unrecognized NFC tag format");
    }

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

    @Override
    public void finish() {
        // Prepare data in tent
        Intent data = new Intent();
        if (tag_data != null) {
            // Activity finished ok, return the data
            data.putExtra("tag_data", tag_data);
            setResult(RESULT_OK, data);
        }
        else {
            setResult(RESULT_CANCELED, data);
        }

        super.finish();
    }
}