Java tutorial
package com.golfwallet.main; import java.util.ArrayList; import java.util.List; import java.util.concurrent.ExecutionException; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.nfc.NfcAdapter; import android.nfc.NfcAdapter.ReaderCallback; import android.nfc.Tag; import android.nfc.tech.IsoDep; import android.os.Bundle; import android.provider.Settings.Secure; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.golfwallet.R; import com.golfwallet.connectivity.APITest; import com.golfwallet.connectivity.HTTPRequest; import com.golfwallet.identification.LoginActivity; import com.golfwallet.identification.SigninActivity; import com.golfwallet.nfc.IsoDepAdapter; import com.golfwallet.nfc.IsoDepTransceiver; import com.golfwallet.nfc.IsoDepTransceiver.OnMessageReceived; import com.golfwallet.preference.ReadWriteData; /** \mainpage * \section intro Introduction * Android application for the NFC Golf Ball Dispenser. * You can : * * Create an account * * Log into your account * * Watch your last transactions * * Know your balance and account status * * Make a transaction using NFC * \section overview Overview * \subsection step1 Home view with the app installed *  * \subsection step2 In-app views *  * \section classdiagram Class Diagram *  * \section license License * This software is developped by Jacky CASAS and was commissioned by Digiclever. * For further information about the license, please contact Digiclever (http://digiclever.com).<br /><br /> * This project was developped at HES-SO//Valais during the bachelor thesis of Jacky Casas in 2014. */ /** \brief * <b>Main activity of the app.</b> * <p> * When the user is not logged, there is two button : * <ul> * <li>Login</li> * <li>Signin</li> * </ul> * </p> * <p> * And when connected, different information are shown : * <ul> * <li>User name</li> * <li>Balance of the user account</li> * <li>Account status</li> * <li>Date of registration</li> * <li>List of the last transations</li> * </ul> * </p> * \author Jacky CASAS * \version 1.0 * \date 04.06.2014 */ public class MainActivity extends Activity implements OnMessageReceived, ReaderCallback { private NfcAdapter nfcAdapter; ///< NfcAdapter fot the NFC support private IsoDepAdapter isoDepAdapter; ///< IsoDepAdapter for the NFC support private static Context context = null; ///< Context of the application private TextView titleTextView; ///< TextView to display the name of the user private TextView balanceTextView; ///< TextView to display the account balance private TextView statusTextView; ///< TextView to display the account status private TextView dateTextView; ///< TextView to display the date of account creation private ListView transactionListView; ///< ListView to display last transactions private Button loginButton; ///< Button to access login activity private Button signinButton; ///< Button to access signin activity /** * \brief Method to get the context of the application * \return The context of the application */ public static Context getAppContext() { return MainActivity.context; } /** * \brief Change the connected status of a user in the application * \param value True for connected and False to unconnected */ public void setConnected(boolean value) { boolean connected = ReadWriteData.getConnectionState(context); if (!connected) { // connection ReadWriteData.setConnected(context); Toast.makeText(MainActivity.this, "Connection", Toast.LENGTH_SHORT).show(); Intent mainIntent = new Intent(MainActivity.this, MainActivity.class); startActivity(mainIntent); finish(); } else { // disconnection ReadWriteData.disconnect(context); ReadWriteData.clearAll(context); Intent mainIntent = new Intent(MainActivity.this, MainActivity.class); startActivity(mainIntent); finish(); } } /** * \brief * Method called when the activity is created * \param savedInstanceState Bundle used to pass information from previous activity to this one */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); MainActivity.context = getApplicationContext(); isoDepAdapter = new IsoDepAdapter(getLayoutInflater()); nfcAdapter = NfcAdapter.getDefaultAdapter(this); String username = ReadWriteData.read(context, ReadWriteData.LOGIN_USERNAME); String password = ReadWriteData.read(context, ReadWriteData.LOGIN_PASSWORD); if (ReadWriteData.getConnectionState(context) && username != null && password != null) { setContentView(R.layout.fragment_main); titleTextView = (TextView) findViewById(R.id.title); balanceTextView = (TextView) findViewById(R.id.balance); statusTextView = (TextView) findViewById(R.id.accountStatus); dateTextView = (TextView) findViewById(R.id.registrationDate); transactionListView = (ListView) findViewById(R.id.transactionList); // GET NEW TOKEN String token = null; try { token = new HTTPRequest().execute("/api/token", username, password).get(); if (token != null) { ReadWriteData.write(context, ReadWriteData.LOGIN_TOKEN, token); saveAID(); } else { Toast.makeText(MainActivity.this, "Connection issues, retry to connect.", Toast.LENGTH_SHORT) .show(); setConnected(false); } } catch (InterruptedException | ExecutionException e) { e.printStackTrace(); Toast.makeText(MainActivity.this, "Connection issues, retry to connect.", Toast.LENGTH_SHORT) .show(); setConnected(false); } // GET ACTIVITY CONTENT FROM API : USER INFORMATIONS String result = "error"; try { if (token == null) { result = new HTTPRequest().execute("/api/user", username, password).get(); } else { result = new HTTPRequest().execute("/api/user", token, "").get(); } try { JSONObject jsonObj = new JSONObject(result); JSONObject user = (JSONObject) jsonObj.get("user"); if (user.has("name") && user.has("surname")) { titleTextView .setText("Hi, " + user.getString("name") + " " + user.getString("surname") + " !"); } else { titleTextView.setText("Hi, " + user.getString("username") + " !"); } balanceTextView.setText("balance : " + user.getInt("balance") + " CHF"); switch (user.getInt("statement")) { case Constants.STA_USER_ACTIVE: statusTextView.setText("account status : active"); break; case Constants.STA_USER_DELETED: statusTextView.setText("account status : deleted"); break; case Constants.STA_USER_INACTIVE: statusTextView.setText("account status : inactive"); break; } dateTextView.setText( "registration date : " + user.getString("registrationDate").replace(" GMT", "")); } catch (JSONException e) { e.printStackTrace(); } } catch (InterruptedException | ExecutionException e) { e.printStackTrace(); } // GET ACTIVITY CONTENT FROM API : TRANSACTIONS FROM USER result = "error"; try { if (token == null) { result = new HTTPRequest().execute("/api/transactions", username, password).get(); } else { result = new HTTPRequest().execute("/api/transactions", token, "").get(); } List<Transaction> transactionList = new ArrayList<Transaction>(); try { JSONObject jsonObj = new JSONObject(result); JSONArray json = (JSONArray) jsonObj.get("transactions"); Toast.makeText(MainActivity.getAppContext(), "Your " + json.length() + " last transactions", Toast.LENGTH_LONG).show(); for (int i = 0; i < json.length(); i++) { JSONObject c = json.getJSONObject(i); int amount = c.getInt("amount"); int type = c.getInt("transactionType"); String transactionDate = c.getString("transactionDate"); String deviceId = c.getString("deviceId"); String dispenserId = c.getString("dispenserId"); transactionList.add(new Transaction(amount, type, transactionDate, deviceId, dispenserId)); } } catch (JSONException e) { e.printStackTrace(); } TransactionAdapter transactionAdapter = new TransactionAdapter(this, R.layout.transaction_row, transactionList); transactionListView.setAdapter(transactionAdapter); } catch (InterruptedException | ExecutionException e) { e.printStackTrace(); } } else { setContentView(R.layout.log_layout); loginButton = (Button) findViewById(R.id.loginbutton); signinButton = (Button) findViewById(R.id.signinbutton); loginButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent loginIntent = new Intent(MainActivity.this, LoginActivity.class); startActivity(loginIntent); finish(); } }); signinButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent signinIntent = new Intent(MainActivity.this, SigninActivity.class); startActivity(signinIntent); finish(); } }); } } /** * \brief * Method which create the option menu of the top right of the app. * \param menu Menu that contains the different items to be displayed * \return True if the menu is correctly created */ @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); if (ReadWriteData.getConnectionState(context)) { menu.findItem(R.id.action_logout).setTitle("Logout"); } else { menu.findItem(R.id.action_logout).setTitle("Login"); } return true; } /** * \brief * Method called when the user click on a menu item. * \param item An item of the menu * \return Say if the action of selection is made correctly or not */ @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { Toast.makeText(MainActivity.this, "Settings clicked", Toast.LENGTH_SHORT).show(); Intent apiTestIntent = new Intent(MainActivity.this, APITest.class); MainActivity.this.startActivity(apiTestIntent); return true; } else if (id == R.id.action_logout) { if (ReadWriteData.getConnectionState(context)) { Toast.makeText(MainActivity.this, "Bye bye !", Toast.LENGTH_SHORT).show(); item.setTitle("Login"); setConnected(false); } else { item.setTitle("Logout"); Intent loginIntent = new Intent(MainActivity.this, LoginActivity.class); startActivity(loginIntent); finish(); } return true; } return super.onOptionsItemSelected(item); } /** * \brief * Method called when the activity is brought to the front. */ @Override public void onResume() { super.onResume(); nfcAdapter.enableReaderMode(this, this, NfcAdapter.FLAG_READER_NFC_A | NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK, null); } /** * \brief * Method called just before the activity goes on the background. */ @Override public void onPause() { super.onPause(); nfcAdapter.disableReaderMode(this); } /** * \brief * Method called when the service detect a NFC card. * \param tag Tag that the service has detected */ @Override public void onTagDiscovered(Tag tag) { IsoDep isoDep = IsoDep.get(tag); IsoDepTransceiver transceiver = new IsoDepTransceiver(isoDep, this); Thread thread = new Thread(transceiver); thread.start(); } /** * \brief * Method called when we receive a message from the tag * \param message Bytes array containing the message */ @Override public void onMessage(final byte[] message) { runOnUiThread(new Runnable() { @Override public void run() { isoDepAdapter.addMessage(new String(message)); } }); } /** * \brief * Method called when an error occured when chatting with the card. * \param exception Exception */ @Override public void onError(Exception exception) { onMessage(exception.getMessage().getBytes()); } /** * \brief * Method that fetch the AID (through API) and store it in the SharedPreferences. */ private void saveAID() { // AID = Application ID = unique 4 bytes identifier for each Android devices of an account // the AID is generated in the API String username; String password; String token = ReadWriteData.read(context, ReadWriteData.LOGIN_TOKEN); String result = null; String androidId = Secure.getString(MainActivity.getAppContext().getContentResolver(), Secure.ANDROID_ID); try { if (token == null) { username = ReadWriteData.read(context, ReadWriteData.LOGIN_USERNAME); password = ReadWriteData.read(context, ReadWriteData.LOGIN_PASSWORD); result = new HTTPRequest().execute("/api/deviceid", username, password, "/" + androidId).get(); } else { result = new HTTPRequest().execute("/api/deviceid", token, "", "/" + androidId).get(); } ReadWriteData.write(context, ReadWriteData.NFC_AID, result); } catch (InterruptedException | ExecutionException e) { e.printStackTrace(); setConnected(false); Toast.makeText(MainActivity.getAppContext(), "An error occured, please try to connect again.", Toast.LENGTH_SHORT).show(); } } /** * \brief * Method that returns the AID. If the user is connected, the unique AID is returned * but if not, the default AID is returned. * \return A byte array that contains the AID */ public static byte[] getAID() { String AID = ReadWriteData.read(context, ReadWriteData.NFC_AID); Toast.makeText(MainActivity.getAppContext(), "aid : " + AID, Toast.LENGTH_SHORT).show(); if (ReadWriteData.getConnectionState(context) && AID != null) { String[] separatedAID = AID.split(" "); byte[] aid = new byte[separatedAID.length]; for (int i = 0; i < separatedAID.length; i++) { aid[i] = (byte) (Integer.parseInt(separatedAID[i], 16) & 0xff); } return aid; } else { return Constants.DEF_ANDROID_ID; } } }