Question

我正在尝试通过websocket发送数据并接收相同的回声。当我尝试通过后台线程发送它时，我没有收到回音。可能有什么不对？通过后台线程发送数据是否不正确？如果是这样，为什么？

请检查我的代码以及随附的相关日志。

private final class EchoWebSocketListener extends WebSocketListener  {
    private static final int NORMAL_CLOSURE_STATUS = 1000;

    @Override
    public void onOpen(final WebSocket webSocket, Response response) {

        class SendData extends AsyncTask {

            @Override
            protected void onPreExecute(){
                Log.d("Websocket","In Pre-execute");
                webSocket.send("In pre-execute");
            }

            @Override
            protected Object doInBackground(Object[] objects) {
                Log.d("AsyncTask","In doInBackground");
                //The below statement receives no echo
                webSocket.send("doInBackground");
                Log.d("AsyncTask","In END of doInBackground");
                return null;
            }
        }

        new SendData().execute();
        webSocket.send(ByteString.decodeHex("1245"));
        webSocket.close(NORMAL_CLOSURE_STATUS, "Goodbye !");
    }

    @Override
    public void onMessage(WebSocket webSocket, String text) {
        Log.i("Receiving : ",text);
    }

    @Override
    public void onMessage(WebSocket webSocket, ByteString bytes) {
        Log.i("Receiving bytes : " , bytes.hex());
    }

    @Override
    public void onClosing(WebSocket webSocket, int code, String reason) {
        webSocket.close(NORMAL_CLOSURE_STATUS, null);
        Log.i("Closing : " , code + " / " + reason);
    }

    @Override
    public void onFailure(WebSocket webSocket, Throwable t, Response response) {
        Log.i("Error", "Error in WebsocketEcho");
    }
}

日志：

D/AsyncTask: In Pre-execute
D/AsyncTask: In doInBackground
D/AsyncTask: In END of doInBackground
I/Receiving :: In pre-execute
I/Receiving bytes :: 1245
I/Closing :: 1000 / Goodbye !

Answer 1

完成关闭线程时的异步任务。因此完成AsyncTask时关闭套接字的线程。从asyncTask中使用你的套接字然后它将工作。有关详细信息，请参阅执行异步任务和threadpoolexecutor。

您可以在此处找到更多详细信息：

https://developer.android.com/reference/android/os/AsyncTask.html

无法通过Websocket从AsyncTask的doInBackground方法发送数据

1 个答案: