Java tutorial
/* * Copyright (C) 2009 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.pendragon.blueconnect; import android.app.ActionBar; import android.app.Activity; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.view.inputmethod.EditorInfo; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import java.io.OutputStreamWriter; import android.support.v4.app.NotificationCompat; import android.support.v4.app.TaskStackBuilder; import com.pendragon.blueconnect.utils.BluetoothChatService; import com.pendragon.blueconnect.utils.MySingleton; import java.io.OutputStreamWriter; /** * Main principal de los chat. */ public class BluetoothChat extends Activity { int notificationID; // Debugging private static final String TAG = "BluetoothChat"; private static final boolean D = true; // tipos de mensajes del Handler del chat public static final int MESSAGE_STATE_CHANGE = 1; public static final int MESSAGE_READ = 2; public static final int MESSAGE_WRITE = 3; public static final int MESSAGE_DEVICE_NAME = 4; public static final int MESSAGE_TOAST = 5; // nombres recibidos del servicio de chat BT Handler public static final String DEVICE_NAME = "device_name"; public static final String TOAST = "toast"; // Codigos de los intent private static final int REQUEST_CONNECT_DEVICE_SECURE = 1; private static final int REQUEST_CONNECT_DEVICE_INSECURE = 2; private static final int REQUEST_ENABLE_BT = 3; // Layouts private ListView mConversationView; private EditText mOutEditText; private Button mSendButton; // nombre disp conectados private String mConnectedDeviceName = null; // Array de adaptador para las conversaciones private ArrayAdapter<String> mConversationArrayAdapter; // buffer para mensajes salientes private StringBuffer mOutStringBuffer; // adaptador BT propio private BluetoothAdapter mBluetoothAdapter = null; // Objeto del servicio de chat private BluetoothChatService mChatService = null; static BluetoothChat instance; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (D) Log.e(TAG, "+++ ON CREATE +++"); //Para las notificaciones notificationID = 1; // Le ponemos un layout setContentView(R.layout.main); // obtenemos el adaptador propio mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); // Si el adaptador es null, no tenemos BT en el movil if (mBluetoothAdapter == null) { Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_LONG).show(); finish(); return; } if (MySingleton.getInstance().getInitBluetooth() == 0) { Intent serverIntent = null; serverIntent = new Intent(this, MainActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE); MySingleton.getInstance().setInitBluetooth(1); } instance = this; } @Override public void onStart() { super.onStart(); if (D) Log.e(TAG, "++ ON START ++"); // Pedimos activar BT si no est activo // Si ya estaba activo, lanzamos el chat if (!mBluetoothAdapter.isEnabled()) { Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableIntent, REQUEST_ENABLE_BT); } else { if (mChatService == null) setupChat(); } } @Override public synchronized void onResume() { super.onResume(); if (D) Log.e(TAG, "+ ON RESUME +"); // Este estado se mantendr mientras el BT no est activo. if (mChatService != null) { // Si el estado es STATE_NONE , de acuerdo a los cdigos, sabremos que aun no esta BT activo if (mChatService.getState() == BluetoothChatService.STATE_NONE) { // Esto lanza el servicio BT mChatService.start(); } } } private void setupChat() { Log.d(TAG, "setupChat()"); // Inicializa el array de adaptadores para la conversacin. mConversationArrayAdapter = new ArrayAdapter<String>(this, R.layout.message); mConversationView = (ListView) findViewById(R.id.in); mConversationView.setAdapter(mConversationArrayAdapter); // Inicializa el campo de texto editable. mOutEditText = (EditText) findViewById(R.id.edit_text_out); mOutEditText.setOnEditorActionListener(mWriteListener); // Hacemos lo mismo con el boton de envio. mSendButton = (Button) findViewById(R.id.button_send); mSendButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { //Enviamos un mensaje usando el contenido del texto editable. TextView view = (TextView) findViewById(R.id.edit_text_out); String message = view.getText().toString(); sendMessage(message); } }); // Iniciamos el BluetoothChatService mChatService = new BluetoothChatService(this, mHandler); // Iniciamos el buffer de mensajes salientes, por si quisieramos guardar mensajes o para guardarlos //en la cola. mOutStringBuffer = new StringBuffer(""); } @Override public synchronized void onPause() { super.onPause(); if (D) Log.e(TAG, "- ON PAUSE -"); } @Override public void onStop() { super.onStop(); if (D) Log.e(TAG, "-- ON STOP --"); } @Override public void onBackPressed() { Intent serverIntent = null; serverIntent = new Intent(this, MainActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE); } public static BluetoothChat getInstance() { return instance; } @Override public void onDestroy() { super.onDestroy(); // para el servicio de BT if (mChatService != null) mChatService.stop(); if (D) Log.e(TAG, "--- ON DESTROY ---"); MySingleton.getInstance().setInitBluetooth(0); } @Override protected void onSaveInstanceState(Bundle bundle) { super.onSaveInstanceState(bundle); } @Override protected void onRestoreInstanceState(Bundle bundle) { super.onRestoreInstanceState(bundle); } private void ensureDiscoverable() { if (D) Log.d(TAG, "ensure discoverable"); if (mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) { Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); startActivity(discoverableIntent); } } /** * Manda un mensaje * El parametro message es un string con el que mandamos el mensaje. */ private void sendMessage(String message) { // Primero asegurarnos que estamos conectados if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) { Toast.makeText(this, R.string.not_connected, Toast.LENGTH_SHORT).show(); return; } // Comprueba que hay algo que enviar if (message.length() > 0) { // obtenemos los bytes y escribimos con el servicio de chat byte[] send = message.getBytes(); mChatService.write(send); // Limpiamos el campo de texto para volver a enviar mOutStringBuffer.setLength(0); mOutEditText.setText(mOutStringBuffer); } } //Listener del campo de texto editable. private TextView.OnEditorActionListener mWriteListener = new TextView.OnEditorActionListener() { public boolean onEditorAction(TextView view, int actionId, KeyEvent event) { // Si el cdigo coincide con la actualizacion de una accion (ACTION UP) //Mandamos el mensaje if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_UP) { String message = view.getText().toString(); sendMessage(message); } if (D) Log.i(TAG, "END onEditorAction"); return true; } }; private final void setStatus(int resId) { final ActionBar actionBar = getActionBar(); actionBar.setSubtitle(resId); } private final void setStatus(CharSequence subTitle) { final ActionBar actionBar = getActionBar(); actionBar.setSubtitle(subTitle); } ///****************************BLOQUE DE NOTIFICACIONES********************************** ///*********************FIN BLOQUE NOTIFICACIONES ******************************* // Handler que devuelve la informacin del servicio de chat de BT private final Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MESSAGE_STATE_CHANGE: if (D) Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1); switch (msg.arg1) { case BluetoothChatService.STATE_CONNECTED: setStatus(getString(R.string.title_connected_to, mConnectedDeviceName)); mConversationArrayAdapter.clear(); break; case BluetoothChatService.STATE_CONNECTING: setStatus(R.string.title_connecting); break; case BluetoothChatService.STATE_LISTEN: case BluetoothChatService.STATE_NONE: setStatus(R.string.title_not_connected); break; } break; case MESSAGE_WRITE: byte[] writeBuf = (byte[]) msg.obj; // Este es el caso opuesto al de antes, construimos el string a partir de bytes String writeMessage = new String(writeBuf); mConversationArrayAdapter.add("Me: " + writeMessage); break; case MESSAGE_READ: byte[] readBuf = (byte[]) msg.obj; // leemos el string del flujo de bytes. String readMessage = new String(readBuf, 0, msg.arg1); mConversationArrayAdapter.add(mConnectedDeviceName + ": " + readMessage); displayNotification(); break; case MESSAGE_DEVICE_NAME: // Aqui guardamos el nombre del dispositivo conectado para el historial mConnectedDeviceName = msg.getData().getString(DEVICE_NAME); // guardamos el nombre del dispositivo MySingleton.getInstance().setString(mConnectedDeviceName); Toast.makeText(getApplicationContext(), "Connected to " + mConnectedDeviceName, Toast.LENGTH_SHORT) .show(); break; case MESSAGE_TOAST: Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST), Toast.LENGTH_SHORT).show(); break; } } }; public void onActivityResult(int requestCode, int resultCode, Intent data) { if (D) Log.d(TAG, "onActivityResult " + resultCode); switch (requestCode) { case REQUEST_CONNECT_DEVICE_SECURE: // Devuelve un dipositivo al que conectarse( OK) if (resultCode == Activity.RESULT_OK) { connectDevice(data, true); } break; case REQUEST_CONNECT_DEVICE_INSECURE: // Devuelve un dispositivo al que conectarse(pero de forma insegura) if (resultCode == Activity.RESULT_OK) { connectDevice(data, false); } break; case REQUEST_ENABLE_BT: //Resultado de activar BT if (resultCode == Activity.RESULT_OK) { // Bt activo, iniciamos chat setupChat(); } else { // No se ha activado BT, o ha dado error. Log.d(TAG, "BT not enabled"); Toast.makeText(this, R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show(); finish(); } } } private void connectDevice(Intent data, boolean secure) { // Obtenemos la MAC del dispositivo al que nos conectamos String address = data.getExtras().getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS); // Obtenemos el objeto de dispositivo BT. BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address); // lanzamos para conectarnos al servicio de forma segura. mChatService.connect(device, secure); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.option_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { Intent serverIntent = null; switch (item.getItemId()) { case R.id.secure_connect_scan: //Lanza DeviceListActivity para ver los dispositivos y escanear. serverIntent = new Intent(this, DeviceListActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE); return true; case R.id.insecure_connect_scan: // Lo mismo pero de forma insegura serverIntent = new Intent(this, DeviceListActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_INSECURE); return true; case R.id.discoverable: // hace nuestro dispositivo visible durante 300segundos (por defecto) ensureDiscoverable(); return true; } return false; } public void displayNotification() { Intent i = new Intent("notify_filter"); i.putExtra("notificationID", notificationID); PendingIntent pi = PendingIntent.getActivity(this, 0, i, 0); NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); Notification notification = new Notification(R.drawable.app_icon, "Notificacion Bluetooth", System.currentTimeMillis()); CharSequence from = "Manager "; CharSequence message = "Nuevo mensaje recibido"; notification.setLatestEventInfo(this, from, message, pi); notification.vibrate = new long[] { 100, 250, 100, 500 }; nm.notify(notificationID, notification); } }