net.gpii.android.listener.activity.NfcListenerActivity.java Source code

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Here is the source code for net.gpii.android.listener.activity.NfcListenerActivity.java

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/**
 * ${project.name}
 *
 * Copyright 2013 Tony Atkins
 *
 * Licensed under the New BSD license. You may not use this file except in
 * compliance with this License.
 *
 * You may obtain a copy of the License at
 * https://github.com/gpii/universal/LICENSE.txt
 */
package net.gpii.android.listener.activity;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.net.URL;

import net.gpii.android.listener.Constants;
import net.gpii.android.listener.R;
import net.gpii.android.listener.listener.ActivityQuitListener;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;

import android.app.Activity;
import android.net.http.AndroidHttpClient;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class NfcListenerActivity extends Activity {
    private ProgressBar progressView;
    private TextView statusTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.nfc);

        statusTextView = (TextView) findViewById(R.id.nfcStatusText);
        progressView = (ProgressBar) findViewById(R.id.nfcProgressBar);

        Button closeButton = (Button) findViewById(R.id.nfcExitButton);
        closeButton.setOnClickListener(new ActivityQuitListener(this));

        try {
            Parcelable[] messages = getIntent().getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
            NdefMessage message = (NdefMessage) messages[0];
            NdefRecord record = message.getRecords()[0];

            byte[] payload = record.getPayload();
            //      String textEncoding = ((payload[0] & 0200) == 0) ? "UTF-8" : "UTF-16";
            String textEncoding = "UTF-8";
            int languageCodeLength = payload[0] & 0077;

            String username = new String(payload, languageCodeLength + 1, payload.length - languageCodeLength - 1,
                    textEncoding);
            if (username.trim().length() == 0) {
                String errorMessage = "Empty username found on NFC tag.";
                statusTextView.setText(errorMessage);
                progressView.setVisibility(View.INVISIBLE);
            } else {
                GpiiLoginAsyncTask task = new GpiiLoginAsyncTask();
                task.execute(username.trim());
            }
        } catch (UnsupportedEncodingException e) {
            String errorMessage = "Error unpacking NFC text record.";
            statusTextView.setText(errorMessage);
            progressView.setVisibility(View.INVISIBLE);
            Log.e(Constants.TAG, errorMessage, e);
        }
    }

    private class GpiiLoginAsyncTask extends AsyncTask<String, String, Long> {
        @Override
        protected Long doInBackground(String... params) {
            String username = params[0];
            String resultMessage = "...";
            try {
                URL loginUrl = new URL(Constants.USER_REST_URL + "/" + username + "/login");
                // Try to log in 
                AndroidHttpClient httpClient = AndroidHttpClient.newInstance("Android Device");
                HttpGet httpGet = new HttpGet(loginUrl.toURI());
                HttpResponse httpResponse = httpClient.execute(httpGet);

                int statusCode = httpResponse.getStatusLine().getStatusCode();
                switch (statusCode) {
                case HttpStatus.SC_OK:
                case HttpStatus.SC_ACCEPTED:
                    resultMessage = "Logged in as user '" + username + "'.";
                    Log.d(Constants.TAG, resultMessage);
                    break;
                case HttpStatus.SC_NOT_FOUND:
                    resultMessage = "GPII server not found.";
                    Log.e(Constants.TAG, resultMessage);
                    break;
                case HttpStatus.SC_INTERNAL_SERVER_ERROR:
                    resultMessage = "Unknown error logging in, status code " + statusCode;
                    Log.e(Constants.TAG, resultMessage);
                    break;
                default:
                    resultMessage = "Unknown login results with status code " + statusCode;
                    Log.e(Constants.TAG, resultMessage);
                    break;
                }
            } catch (URISyntaxException e) {
                resultMessage = "Error converting login URL to URI.";
                Log.e(Constants.TAG, resultMessage, e);
            } catch (IOException e) {
                resultMessage = "GPII server not found.";
                Log.e(Constants.TAG, resultMessage, e);
            }

            publishProgress(resultMessage);

            return 0L;
        }

        @Override
        protected void onProgressUpdate(String... values) {
            super.onProgressUpdate(values);

            statusTextView.setText(values[0]);
            progressView.setVisibility(View.INVISIBLE);
        }
    }

}