使用 Google Glass 的无线 TCP 和 UDP

Question

我已经为 Google Glass 开发了 TCP 和 UDP 应用程序。这是 UDP 的实现：

public class MainActivity extends Activity
{
    private TextView mTextView;
    private someRunnable mRun;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity);
        mTextView = (TextView) findViewById(R.id.textView);

        Handler mHandler = new Handler()
        {

            @Override
            public void handleMessage(Message msg)
            {
                Bundle bundle = msg.getData();
                mTextView.setText(bundle.getString("message"));
                super.handleMessage(msg);
            }
        };

        try
        {
            mRun = new someRunnable(mHandler);
            (new Thread(mRun)).start();
        }
        catch (IOException e)
        {
            Log.e("Error", "Unable to start Network activity");
            Log.e("Error", e.getLocalizedMessage());
        }
    }

    @Override
    protected void onDestroy()
    {
        mRun.stopNetworkActivity();
        super.onDestroy();
    }
}

我有一个服务器每 .5 秒不断发送包含数字的数据包。 Glass 应用程序接收数据并将其显示在 TextView 上。我知道 UDP 不可靠，但即使使用 TCP，我也会得到随机的 "pauses"，它会持续大约 4 秒，然后重新发送大量数据包 - 当然暂停，我的意思是 Glass 只是丢弃数据包强制服务器重新发送。或者更糟的是，UDP 只有 "drop and move on"。

进行进一步分析后，应用程序似乎仅在 LogCat 中显示以下内容时暂停：

01-05 16:22:43.812: W/BluetoothAdapter(951): getBluetoothService() called with no BluetoothManagerCallback
01-05 16:22:43.812: D/BluetoothSocket(951): connect(), SocketState: INIT, mPfd: {ParcelFileDescriptor: FileDescriptor[122]}
01-05 16:22:48.203: W/bt-sdp(951): SDP - Rcvd conn cnf with error: 0x4  CID 0x40
01-05 16:22:48.203: E/btif_sock_rfcomm(951): find_rfc_slot_by_id unable to find RFCOMM slot id: 1356
01-05 16:22:53.336: W/bt-sdp(951): SDP - Rcvd conn cnf with error: 0x4  CID 0x42
01-05 16:22:53.336: E/btif_sock_rfcomm(951): find_rfc_slot_by_id unable to find RFCOMM slot id: 1357
01-05 16:22:53.336: W/BluetoothMapClientService(951): connection failed
01-05 16:22:53.336: W/BluetoothMapClientService(951): java.io.IOException: read failed, socket might closed or timeout, read ret: -1
01-05 16:22:53.336: W/BluetoothMapClientService(951):   at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:521)
01-05 16:22:53.336: W/BluetoothMapClientService(951):   at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:532)
01-05 16:22:53.336: W/BluetoothMapClientService(951):   at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:323)
01-05 16:22:53.336: W/BluetoothMapClientService(951):   at com.android.bluetooth.map.BluetoothMapClientService.connect(BluetoothMapClientService.java:262)
01-05 16:22:53.336: W/BluetoothMapClientService(951):   at com.android.bluetooth.map.BluetoothMapClientService.connect(BluetoothMapClientService.java:94)
01-05 16:22:53.336: W/BluetoothMapClientService(951):   at android.bluetooth.IBluetoothMapClient$Stub.onTransact(IBluetoothMapClient.java:60)
01-05 16:22:53.336: W/BluetoothMapClientService(951):   at android.os.Binder.execTransact(Binder.java:404)
01-05 16:22:53.336: W/BluetoothMapClientService(951):   at dalvik.system.NativeStart.run(Native Method)

抛出IOException后，一切恢复正常，正常运行。

如果我通过蓝牙将 Glass 连接到我的 phone，上面的消息不会显示并且一切运行完美（没有暂停）。

为什么 BluetoothSocket 对我的应用程序有如此大的影响？除了在运行应用程序之前强制客户端通过蓝牙连接之外，我还能做些什么吗？

Answer 1

在 HERE

上查看此线程

顺便问一下，你的项目是开源的吗？

使用 Google Glass 的无线 TCP 和 UDP

TCP & UDP Over Wireless with Google Glass

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network-programming

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google-gdk