Question

android 怎么通过蓝牙向一个硬件发送AT指令

Answer 1

通过BluetoothSocket的OutputStream发送过去后,InputStream获取不到数据...代码用的android自带的蓝牙例子.这样发送指令后

?12String string = "41542B50494F392C310D";mmOutStream.write(string.getBytes());读取inputsteam中的?1Log.d("example", "do read");

不执行,完整代码如下:

?1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980/** * This thread runs during a connection with a remote device. It handles all * incoming and outgoing transmissions. */private class ConnectedThread extends Thread {    private final BluetoothSocket mmSocket;    private final InputStream mmInStream;    private final OutputStream mmOutStream;     public ConnectedThread(BluetoothSocket socket, String socketType) {        Log.d(TAG, "create ConnectedThread: " + socketType);        mmSocket = socket;        InputStream tmpIn = null;        OutputStream tmpOut = null;         // Get the BluetoothSocket input and output streams        try {            tmpIn = socket.getInputStream();            tmpOut = socket.getOutputStream();        } catch (IOException e) {            Log.e(TAG, "temp sockets not created", e);        }         mmInStream = tmpIn;        mmOutStream = tmpOut;    }     public void run() {        Log.i(TAG, "BEGIN mConnectedThread");        byte[] buffer = new byte[1024];        int bytes;         // Keep listening to the InputStream while connected        while (true) {            Log.d("example", "do read");            try {                // Read from the InputStream                bytes = mmInStream.read(buffer);                 // Send the obtained bytes to the UI Activity                mHandler.obtainMessage(BluetoothChat.MESSAGE_READ, bytes,                        -1, buffer).sendToTarget();            } catch (IOException e) {                Log.e(TAG, "disconnected", e);                connectionLost();                // Start the service over to restart listening mode                BluetoothChatService.this.start();                break;            }        }    }     /**     * Write to the connected OutStream.     *      * @param buffer     *            The bytes to write     */    public void write(byte[] buffer) {         String string = "41542B50494F392C310D";        try {            mmOutStream.write(string.getBytes());             // Share the sent message back to the UI Activity            mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1,                    buffer).sendToTarget();        } catch (IOException e) {            Log.e(TAG, "Exception during write", e);        }    }     public void cancel() {        try {            mmSocket.close();        } catch (IOException e) {            Log.e(TAG, "close() of connect socket failed", e);        }    }}

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Answer 2

将16进制的字符串转换成bytes,通过hexstring2bytes转换而不能直接用getbytes
String string = "41542B50494F392C310D";
mmOutStream.write(string.getBytes());

读取inputsteam中的
?
Log.d("example", "do read");

不执行,完整代码如下:

?

/**
* This thread runs during a connection with a remote device. It handles all
* incoming and outgoing transmissions.
*/
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;

public ConnectedThread(BluetoothSocket socket, String socketType) {
Log.d(TAG, "create ConnectedThread: " + socketType);
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;

// Get the BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "temp sockets not created", e);
}

mmInStream = tmpIn;
mmOutStream = tmpOut;
}

public void run() {
Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;

// Keep listening to the InputStream while connected
while (true) {
Log.d("example", "do read");
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);

// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(BluetoothChat.MESSAGE_READ, bytes,
-1, buffer).sendToTarget();
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
connectionLost();
// Start the service over to restart listening mode
BluetoothChatService.this.start();
break;
}
}
}

/**
* Write to the connected OutStream.
*
* @param buffer
* The bytes to write
*/
public void write(byte[] buffer) {

String string = "41542B50494F392C310D";
try {
mmOutStream.write(string.getBytes());

// Share the sent message back to the UI Activity
mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1,
buffer).sendToTarget();
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
}
}

public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}