Hi,
in my application I need to send and receive data bytewise over TCP.
At the beginning of development I tried to implement that
functionality as resource-efficient as possible.
So I finally decided to use Messages (android.os.Message) to
cyclically initiate reading bytes from socket.
After establishing the connection I assign Input- and OutputStream and
order Android to execute the runnable "readFromSocket" after 100ms:
OutputStream out = null;
InputStream in = null;
Handler readInputHandler;
Socket gateway = new Socket();
gateway.connect(new InetSocketAddress(address, port), 20000);
if (gateway.isConnected()) {
in = gateway.getInputStream();
out = gateway.getOutputStream();
readInputHandler.postDelayed(readFromSocket, 100);
}
The runnable reads one byte after another and passes it to a parser
that tries to assemble the single bytes to an instruction (if the
parser is successful I send the instruction encapsulated in a Message
to a Controller-Object). At the end it orders its own execution after
another 100ms:
private Runnable readFromSocket = new Runnable() {
byte[] input = new byte[1];
@Override
public void run() {
try {
while (in.available() > 0) {
in.read(input);
parser.parse(input[0]);
}
} catch (IOException e) {
// InputStream unavailable
e.printStackTrace();
}
// Initiate reading after 100 ms
readInputHandler.postDelayed(this, 100);
}
};
After testing my app on two different devices (Sony Ericsson Xperia
neo and Acer Iconia Tab) I currently hesitate whether that
implementation is the best solution...
When sending many bytes to the Xperia neo it often takes seconds until
my app has received all bytes.
In comparison, on the Iconia Tab there isn't such a big delay but the
performance also isn't very well.
What is the best solution to implement that functionality for an
Android-App?
Thanks in advance.
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