Managing a Connection
當你已經成功連線兩個或更多裝置，每個裝置都有一個BluetoothSocket。利用BluetoothSocket，輕鬆地通過一般程序傳輸任意數據:
- 取得InputStream和OutputStream處理通過Socket的傳輸，分別是getInputStream()和getOutputStream()。
- read(byte[])和write(byte[])方法讀或寫數據到資訊流中。
首先，你應該使用專用的執行續處理讀與寫的資訊流。這是非常重要的，因為read(byte[])和write(byte[])是阻絕式呼叫，read(byte[])將會組塞直到有東西從資訊流讀取出，write(byte[])不常阻塞，但是如果遠端裝置不快速呼叫read(byte[])方法及中間的緩衝區滿了就會阻塞，所以在執行續中的主迴圈專用來讀取InputStream，執行續中分開的公開方法可以利用來啟動寫入到OutputStream。
舉例
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[1024]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
break;
}
}
}
/* Call this from the main Activity to send data to the remote device */
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) { }
}
/* Call this from the main Activity to shutdown the connection */
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
建構式取得必須的資訊流，一旦執行，執行續等待數據通過InputStream到來，當read(byte[])回傳來自資訊流的byte數據，利用父類別的Handler將數據寄送到主Activity，然後回到執行續中繼續等待更多數據從資訊流送來。
傳送出數據從主Activity呼叫執行續的write()方法，傳入byte數據到方法中，此方法在呼叫write(byte[])將數據傳送到遠端裝置。
執行續的cancel()是重要的，以便通過BluetoothSocket，在任何時間關閉連線，此方法應該在使用完藍芽連線後呼叫。
