CODEWITHSUNDEEP
androidsocketstcpandroid-asynctask
user2085965
user2085965

Reputation: 403

Check the socket connection state in android

I am using an asyncTask which runs for every 1 sec. I must check a condition every 1 sec that the socket connection is available or not before asyncTask starts.

I used socket.isConnected() -> it always returning true.

How to do this.

Please help..

Upvotes: 1

Views: 5030

Answers (3)

SMMB
SMMB

Reputation: 127

Once a connection is made, isConnected() will always return true.

To check if the connection is still alive, you can:

  1. Use socket.getInputStream().read(). This will block until either some data arrives or the connection closes in which case it will return -1. Otherwise it will return the received byte. If you use socket.setSoTimeout(t) and then call read(), 3 things can happen:

    a) The connection closes and read() returns -1;

    b) Some data arrives and read() returns the read byte.

    c) read() will block for t miliseconds and throw SocketTimeoutException which means no data was received and the connection is okay.

  • If you want to ckeck the connection quickly, set the timeout to 1. If you set it to 0, it will block indefinitely which is the default.

2. Use socket.getInetAddress().isReachable(int timeout).

Upvotes: 1

Muhammad Saad Rafique
Muhammad Saad Rafique

Reputation: 3189

Its too late but it may help someone else all you need to do is just check for your socket if it is not null and then in case if it is not null just disconnect your socket else create new socket and connect that

    if(socket != null) {
        socket.disconnect();
    } else {
        socket.createSocket();
        socket.connect();
    }

here create socket is method in which you can create your socket Hope it may help someone.

Upvotes: -1

user12539931
user12539931

Reputation: 1

public class CheckSocket extends AsyncTask<String,String,String>{

    @Override
    protected String doInBackground(String... strings) {
        try {
            socket = new Socket("192.168.15.101", 23);
        } catch (IOException e) {
            e.printStackTrace();
        }

        if(socket.isConnected()){
            Log.d(TAG, "doInBackground: connected");
        }else {
            Log.d(TAG, "doInBackground: not connected");
        }
        return null;
    }
}

Upvotes: -1

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