글
저번 글에서 블루투스 페어링 까지 알아 보았다.
그럼 이번엔 블루투스 사이의 연동부분을 알아보자. 이부분은 블루투스 챗 서비스에 너무너무 잘 나와있다.
그중 필요한 부분만 발췌하였다.
BluetoothClientConnect.java
package com.example.btclient;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import com.example.btclient.util.Logger;
public class BluetoothClientConnect {
// Unique UUID for this application
private static final UUID MY_UUID = UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
// Member fields
private final BluetoothAdapter mBluetoothAdapter;
private final Handler mHandler;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
/**
* Constructor. Prepares a new BluetoothConnect session.
*
* @param context The UI Activity Context
* @param handler A Handler to send messages back to the UI Activity
*/
public BluetoothClientConnect(Context context, Handler handler) {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mHandler = handler;
mState = STATE_NONE;
}
/**
* Set the current state of the chat connection
*
* @param state An integer defining the current connection state
*/
private synchronized void setState(int state) {
Logger.print("setState() " + mState + " -> " + state);
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(BTClientMainActivity.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
/**
* Return the current connection state.
*/
public synchronized int getState() {
return mState;
}
/**
* Start the chat service. Specifically start AcceptThread to begin a
* session in listening (server) mode. Called by the Activity onResume()
*/
public synchronized void start() {
Logger.print("start...");
// Cancel any thread attempting to make a connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
setState(STATE_LISTEN);
}
/**
* Start the ConnectThread to initiate a connection to a remote device.
*
* @param device The BluetoothDevice to connect
*/
public synchronized void connect(BluetoothDevice device) {
Logger.print("connect to: " + device);
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(STATE_CONNECTING);
}
/**
* Start the ConnectedThread to begin managing a Bluetooth connection
*
* @param socket The BluetoothSocket on which the connection was made
* @param device The BluetoothDevice that has been connected
*/
public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) {
Logger.print("connected");
// Cancel the thread that completed the connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(BTClientMainActivity.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(BTClientMainActivity.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
/**
* Stop all threads
*/
public synchronized void stop() {
Logger.print("stop");
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
setState(STATE_NONE);
}
/**
* Write to the ConnectedThread in an unsynchronized manner
*
* @param out The bytes to write
* @see ConnectedThread#write(byte[])
*/
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED) {
return;
}
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
/**
* Indicate that the connection attempt failed and notify the UI Activity.
*/
private void connectionFailed() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BTClientMainActivity.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BTClientMainActivity.TOAST, "Unable to connect device");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
/**
* Indicate that the connection was lost and notify the UI Activity.
*/
private void connectionLost() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BTClientMainActivity.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BTClientMainActivity.TOAST, "Device connection was lost");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
/**
* This thread runs while attempting to make an outgoing connection
* with a device. It runs straight through; the connection either
* succeeds or fails.
*/
private class ConnectThread extends Thread {
private final BluetoothSocket mSocket;
private final BluetoothDevice mDevice;
public ConnectThread(BluetoothDevice device) {
mDevice = device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Logger.print("create() failed : " + e.getMessage());
}
mSocket = tmp;
}
public void run() {
Logger.print("BEGIN mConnectThread");
setName("ConnectThread");
// Always cancel discovery because it will slow down a connection
mBluetoothAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mSocket.connect();
} catch (IOException e) {
connectionFailed();
// Close the socket
try {
mSocket.close();
} catch (IOException e2) {
Logger.print("unable to close() socket during connection failure : " + e2.getMessage());
}
// Start the service over to restart listening mode
BluetoothClientConnect.this.start();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothClientConnect.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mSocket, mDevice);
}
public void cancel() {
try {
mSocket.close();
} catch (IOException e) {
Logger.print("close() of connect socket failed : " + e.getMessage());
}
}
}
/**
* This thread runs during a connection with a remote device.
* It handles all incoming and outgoing transmissions.
*/
private class ConnectedThread extends Thread {
private final BluetoothSocket mSocket;
private final InputStream mInStream;
private final OutputStream mOutStream;
public ConnectedThread(BluetoothSocket socket) {
Logger.print("create ConnectedThread");
mSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Logger.print("temp sockets not created : " + e.getMessage());
}
mInStream = tmpIn;
mOutStream = tmpOut;
}
public void run() {
Logger.print("BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(BTClientMainActivity.MESSAGE_READ, bytes, -1, buffer).sendToTarget();
} catch (IOException e) {
Logger.print("disconnected : " + e.getMessage());
connectionLost();
break;
}
}
}
// /**
// * Write to the connected OutStream.
// *
// * @param buffer The bytes to write
// */
public void write(byte[] buffer) {
try {
mOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(BTClientMainActivity.MESSAGE_WRITE, -1, -1, buffer).sendToTarget();
} catch (IOException e) {
Logger.print("Exception during write : " + e.getMessage());
}
}
public void cancel() {
try {
mSocket.close();
} catch (IOException e) {
Logger.print("close() of connect socket failed : " + e.getMessage());
}
}
}
}
'프로그래밍 > 안드로이드' 카테고리의 다른 글
| 안드로이드 개발하다보면 xml 파일 열때마다 parseSdkContent ~~ 이런 에러가 날때 대처법 (0) | 2014.12.03 |
|---|---|
| fragment life cycle (0) | 2014.11.28 |
| 이클립스 안드로이드 프로젝트에서 jsdt code compleletion(assist) 사용하기 (1) | 2014.11.17 |
| 안드로이드 파일 디렉토리 권한 (0) | 2014.11.04 |
| Bluetooth - server client 연동 (0) | 2014.10.28 |
RECENT COMMENT