android – UDP数据包(通过WiFi Direct)永远不会到达

那些阅读我之前的问题的人可能已经知道这一点：我目前正试图抓住整个WiFi Direct的东西.到目前为止我所做的就是创建连接.
我想要做的是通过UDP将数据包发送到groupOwner(其IP当然是已知的) – 但它似乎每次都迷失方向.

这是我的一些代码,我有一个接收文件的服务和一个在后台提交它们的intentservice：

FileReceiverService.java

    @Override
    public void run() {
        Log.d(TAG, "Thread starting...");
        try {
            app.log("Opening UDP socket to receive files.");
            DatagramSocket socket = new DatagramSocket(PORT);
            app.log("Socket open!");
            socket.setSoTimeout(5000);
            app.log("Waiting for packet..");
            while (isRunning && !isInterrupted()) {
                DatagramPacket packet = new DatagramPacket(
                        new byte[WiFiPacket.PACKET_SIZE],
                        WiFiPacket.PACKET_SIZE);
                try {
                    socket.receive(packet);
                    app.log("Received " + packet.getLength()
                            + " bytes, trying to parse!");
                    parsePacket(packet);
                } catch (SocketTimeoutException e) {
                } catch (Exception e) {
                    app.log("Something went wrong: " + e.getMessage());
                    e.printStackTrace();
                }
            }
            socket.close();
            app.log("Closing UDP socket");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

常量WiFiPacket.PACKET_SIZE设置为1024 * 32(32 KB,因为我收到“ERRBLABLA MSG太长”错误,值较高).

FileTransferService.java

@Override
protected void onHandleIntent(Intent intent) {
    App app = (App) getApplication();

    Context context = getApplicationContext();
    boolean rightIntent = false;
    WiFiFile file = null;

    if (intent.getAction().equals(ACTION_SEND_TEXT)) {
        rightIntent = true;
        file = WiFiFile.fromText(intent.getExtras().getString(EXTRAS_TEXT));
    } else if (intent.getAction().equals(ACTION_SEND_FILE)) {
        rightIntent = true;
        file = WiFiFile.fromFile(intent.getExtras().getString(
                EXTRAS_FILE_PATH));
    }
    if (rightIntent && file != null) {

        app.getOnWiFiTransmissionChangedListener().onNewOutgoingTransfer(
                file);
        String text = intent.getExtras().getString(EXTRAS_TEXT);
        String host = intent.getExtras().getString(
                EXTRAS_GROUP_OWNER_ADDRESS);
        DatagramSocket socket = null;
        int port = intent.getExtras().getInt(EXTRAS_GROUP_OWNER_PORT);
        Log.d(TAG, "Sending packets to " + host + ":" + port);
        try {
            socket = new DatagramSocket();
            int bytesSent = 0;
            for (WiFiPacket p : file) {
                Log.d(TAG, "Preparing another packet..");
                byte[] payload = p.getBytes();
                DatagramPacket packet = new DatagramPacket(payload,
                        payload.length, InetAddress.getByName(host), port);
                Log.d(TAG, "Sending packet..");
                socket.send(packet);
                bytesSent += payload.length;
                Log.d(TAG, "Packet send! Contained " + payload.length
                        + " bytes! All over we've sent about " + bytesSent
                        + " bytes!");
                List<WiFiFile> list = new ArrayList<WiFiFile>();
                list.add(file);
                app.getOnWiFiTransmissionChangedListener()
                        .onTransferProgressChanged(list);
            }

            app.getOnWiFiTransmissionChangedListener()
                    .onFileTransferSuccessful(file);

            Log.d(TAG, "Client: Data written");
        } catch (IOException e) {
            e.printStackTrace();
            Log.e(TAG, e.getMessage());
        } finally {
            if (socket != null) {
                if (socket.isConnected()) {
                    socket.close();
                }
            }
        }

    }
}

代码可能不是最好的,但至于现在我唯一关心的是接收该死的数据包.

标签：wifi-direct,android,udp
来源： https://codeday.me/bug/20190826/1728446.html