两款Android设备之间的蓝牙数据传输 [英] Bluetooth data transfer between two Android devices

问题描述

我一直在关注这款Android指南蓝牙通讯

要正是我想做的事情解释一下，当两个设备配对，两个不同的活动开各个设备（服务器和客户端），其中对服务器的活动我有不同的按钮，并在客户的活动也只是一个TextView。 我希望能够以preSS的所述服务器装置上的按钮，并在客户端上显示它。

To explain exactly what I want to do, when the two devices are paired, two different activities open up on each device (server and client) where on the server activity I have different buttons, and on the client activity there is just a textview. I want to be able to press a button on the server device and display it on the client.

我已成功地建立在两个设备之间的连接，但现在我要发送数据，我一直没能做到。

I have managed to establish a connection between the two devices, but now I want to send data which I have not been able to do.

他们发现，这code数据传输：

They give this code for data transfer:

private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;

public ConnectedThread(BluetoothSocket socket) {
    mmSocket = socket;
    InputStream tmpIn = null;
    OutputStream tmpOut = null;

    // Get the input and output streams, using temp objects because
    // member streams are final
    try {
        tmpIn = socket.getInputStream();
        tmpOut = socket.getOutputStream();
    } catch (IOException e) { }

    mmInStream = tmpIn;
    mmOutStream = tmpOut;
}

public void run() {
    byte[] buffer = new byte[1024];  // buffer store for the stream
    int bytes; // bytes returned from read()

    // Keep listening to the InputStream until an exception occurs
    while (true) {
        try {
            // Read from the InputStream
            bytes = mmInStream.read(buffer);
            // Send the obtained bytes to the UI activity
            mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                    .sendToTarget();
        } catch (IOException e) {
            break;
        }
    }
}

/* Call this from the main activity to send data to the remote device */
public void write(byte[] bytes) {
    try {
        mmOutStream.write(bytes);
    } catch (IOException e) { }
}

/* Call this from the main activity to shutdown the connection */
public void cancel() {
    try {
        mmSocket.close();
    } catch (IOException e) { }
}

}

不过，此行产生一个错误

But this line generates an error

// Send the obtained bytes to the UI activity
            mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();

和在引导没有解释。我不知道mHandler是或做什么。

And is not explained in the guide. I don't know what the mHandler is or does.

除了误差，我甚至不真正明白的地方把这个code。它应该是在第二活动（服务器和客户端），该予打开或在主？如果服务器的活动，它应该是在onclick方法具有不同字节code发送的每个按钮所有的按钮？而在这code，我们怎么区分是谁发送和谁接收？

Apart from the error, I don't even really understand where to put this code. Should it be in the second activities (server and client) that I open or in the main? If in the Server activity, should it be in the onClick method for all the buttons with a different byte code to send for each button ? And in this code, how do we distinguish who is sending and who is receiving ?

任何帮助和建议将大大AP preciated。

Any help and advice would be greatly appreciated.

推荐答案

退房的<一个href="https://android.googlesource.com/platform/development/+/25b6aed7b2e01ce7bdc0dfa1a79eaf009ad178fe/samples/BluetoothChat"相对=nofollow> BluetoothChat 例如，谷歌提供了SDK。它会告诉你如何实现基本的发送文本的通过蓝牙。

Check out the BluetoothChat example that Google provides in the SDK. It'll show you how to implement basic sending of text over bluetooth.

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